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Environmental Factors Affecting Thyroid-Stimulating Hormone and Thyroid Hormone Levels

Mirjana Babić Leko, Ivana Gunjača, Nikolina Pleić and 1 more (opens in a new tab)

International Journal of Molecular Sciences · 2021 · Review · CC BY

doi:10.3390/ijms22126521 (opens in a new tab)

Abstract

Thyroid hormones are necessary for the normal functioning of physiological systems. Therefore, knowledge of any factor (whether genetic, environmental or intrinsic) that alters the levels of thyroid-stimulating hormone (TSH) and thyroid hormones is crucial. Genetic factors contribute up to 65% of interindividual variations in TSH and thyroid hormone levels, but many environmental factors can also affect thyroid function. This review discusses studies that have analyzed the impact of environmental factors on TSH and thyroid hormone levels in healthy adults. We included lifestyle factors (smoking, alcohol consumption, diet and exercise) and pollutants (chemicals and heavy metals). Many inconsistencies in the results have been observed between studies, making it difficult to draw a general conclusion about how a particular environmental factor influences TSH and thyroid hormone levels. However, lifestyle factors that showed the clearest association with TSH and thyroid hormones were smoking, body mass index (BMI) and iodine (micronutrient taken from the diet). Smoking mainly led to a decrease in TSH levels and an increase in triiodothyronine (T3) and thyroxine (T4) levels, while BMI levels were positively correlated with TSH and free T3 levels. Excess iodine led to an increase in TSH levels and a decrease in thyroid hormone levels. Among the pollutants analyzed, most studies observed a decrease in thyroid hormone levels after exposure to perchlorate. Future studies should continue to analyze the impact of environmental factors on thyroid function as they could contribute to understanding the complex background of gene–environment interactions underlying the pathology of thyroid diseases.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 22, 2026. Paragraph numbers are ours, so an answer can point at one.

1. Introduction

Thyroid hormones are crucial for normal development and necessary for the proper functioning of physiological systems. Thyroid hormone synthesis is regulated by feedback mechanisms mediated by the hypothalamus–pituitary–thyroid (HPT) axis. Decreased thyroid hormone levels lead to increased synthesis of hypothalamic thyrotropin-releasing hormone (TRH) which increases the secretion of thyroid-stimulating hormone (TSH) from the anterior pituitary. TSH stimulates the production of thyroid hormones from thyrocytes. Thyroid hormone synthesis requires active iodide uptake through sodium/iodide symporter (NIS), thyroglobulin (Tg) production and Tg iodination by thyroid peroxidase (TPO) enzyme. Thyroid hormones, thyroxine (T4) and triiodothyronine (T3), are released by Tg proteolysis. T4 is released from the thyroid gland in a much larger amount (in a ratio of approximately 14:1). However, most T4 is converted to T3 in target tissues (by the action of type 1 and type 2 iodothyronine deiodinases (Dio1 and Dio2)). When secreted in plasma, thyroid hormones are bound to plasma proteins (more than 99.7%) and only a small amount of thyroid hormones are in unbound (free) form (fT4 and fT3). The unbound form of thyroid hormones is biologically active. Variation in the TSH and thyroid hormone levels may indicate that normal thyroid function has been altered. Since the prevalence of thyroid diseases is very high (it is estimated that 12% of the U.S. population will develop a thyroid condition during their lifetime), understanding the mechanisms underlying the variations in TSH and thyroid hormone levels is crucial. Genetic factors account for up to 65% of interindividual variations in TSH and thyroid hormone levels, but many other factors can also influence thyroid function. Such factors include demographic factors (age and sex), intrinsic factors (microbiota, stress), usage of medicaments and various environmental factors. The purpose of this review is to provide a comprehensive insight into the literature discussing the impact of environmental factors (such as lifestyle factors and pollutants) on TSH and thyroid hormone levels (Figure 1). Knowledge of any factors that could affect TSH and thyroid hormone levels is especially important for vulnerable groups, such as people with thyroid diseases and pregnant women. However, the focus of this review will be on the general population without thyroid diseases.

2. Short Overview of Genetic Factors That Influence TSH and Thyroid Hormone Levels

Twin studies have shown that genetic factors underlie 45–65% of interindividual variations in TSH and thyroid hormone levels. Many of these genetic variants have been identified in genome-wide association studies (GWAS). Genes that contribute to interindividual variations in TSH and thyroid hormone levels are divided into the following groups: genes encoding proteins involved in the synthesis (TG, TPO, CAPZB), metabolism (AADAT, DIO1, DIO2, DIO3OS) and transport (SLC17A4, OATP1B1, MCT8) of thyroid hormones; genes for proteins involved in TSH receptor signaling cascade (TSHR, PDE10A, PDE8B, GNAS, ITPK1); genes encoding growth factors and growth factor binding proteins (FOXA2, IGF2BP2, VEGFA, IGFBP2/IGFBP5, FGF7, INSR, SASH1); genes for transcription factors and proteins involved in the development of HPT axis (SOX9, NCOR1, FOXE1, TTF1/MBIP, GLIS3, LHX3, NFIA); and genes for proteins with unknown thyroid function (reviewed in). Although major progress has been made in researching the genetic basis of thyroid function, many new potential genetic factors affecting TSH and thyroid hormone levels have yet to be discovered.

3.1.1. Smoking

Most studies investigating the influence of smoking on TSH and thyroid hormone levels have observed a decrease in TSH levels and an increase in T3 and T4 levels in smokers. Large population-based studies have confirmed these results (Table 1). In the majority of studies, a decrease in TSH levels was followed by an increase in thyroid hormone levels (Table 1). Recently, in a large cohort of 5766 White North European subjects, Gruppen et al., observed that cigarette smoking leads to a decrease in TSH levels and an increase in fT3 and fT4 levels. Kim et al., even noticed a dose-dependent relationship between cigarette smoking (measured by serum cotinine levels, which is an objective measure of smoke exposure) and TSH levels (study included 4249 participants). They observed that every 10 ng/mL increase in serum cotinine resulted in a 1.4% decrease in TSH levels. It was also observed that TSH levels gradually increased after smoking cessation. The mechanism through which cigarette smoking affects TSH and thyroid hormone levels is still unclear. This is not surprising since there are more than 4000 components in tobacco. One of the proposed mechanisms is that thiocyanate, which is transformed from cyanide in tobacco, inhibits iodide transport and iodine organification (incorporation of iodine into Tg). Since the transport of iodide is a rate-limiting step in the synthesis of thyroid hormones, exposure to thiocyanate results in decreased thyroid hormone synthesis. However, thiocyanate has been observed to decrease protein-bound T4 levels and consequently increase fT4 levels (which could explain the increase in fT4 levels in smokers). Additionally, several studies have suggested that smoking reduces autoimmune processes in the thyroid gland, resulting in alterations in TSH and thyroid hormone levels. It has also been suggested that an increase in thyroid hormone levels and a consequent decrease in TSH levels is the result of increased sympathetic nervous activity in smokers. Alarming results were obtained in the study of Filis et al., showing that maternal smoking disrupts fetal thyroid development.

3.1.2. Alcohol Consumption

Alcohol has been shown to have a toxic effect on thyroid cells, which is considered to be the cause of decreased thyroid volume in alcoholics. A recent study investigating the influence of alcohol consumption on thyroid hormone levels reported an increase in TSH levels and a decrease in fT3 levels. However, other studies reported conflicting results, with TSH levels being unchanged or increased in alcoholics, while levels of thyroid hormones were decreased, unchanged or increased (Table 1). Nevertheless, most of these studies were underpowered, and the study that included the largest number of participants (5766 individuals) detected an increase in TSH levels and a decrease in fT3 levels. Serum Tg levels were increased in patients with chronic alcoholic cirrhosis. Many studies have measured levels of TSH and thyroid hormones during alcohol withdrawal (reviewed in); however, inconsistencies have been reported between studies. Aoun and collaborators even detected a positive correlation between fT3 and alcohol-seeking behaviors in alcoholics. On the other hand, many studies have consistently shown blunted TSH response after TRH stimulation. It has been experimentally proven that chronic ethanol treatment increases TRH levels, which could consequently lead to a decrease in pituitary TRH receptors and blunted TSH response after TRH stimulation. Hermann et al., hypothesized that this could be the mechanism by which alcohol leads to alteration in TSH and thyroid hormone levels. They suggested that a decrease in thyroid hormone levels in alcoholics induces an increase in TRH release. Other authors proposed that thyroid dysfunction in alcoholics may be caused by euthyroid sick syndrome (ESS). This syndrome is characterized by decreased levels of T3 and increased levels of thyroid hormone metabolite reverse T3 (rT3). However, the results of many studies did not support this hypothesis (reviewed in). In addition, there is evidence from in vitro and in vivo studies that additional compounds in some alcoholic beverages, such as resveratrol (a natural polyphenol found in red wine) also have a thyroid-disrupting effect (reviewed in).

3.1.3. Body Mass Index

The majority of studies that investigated the influence of body mass index (BMI) on TSH and thyroid hormone levels reported a positive correlation between BMI values and TSH and fT3 levels (Table 1). Even high maternal BMI has been shown to be associated with increased fetal TSH levels and increased fetal thyroid weight. However, the results of studies investigating the association between fT4 and BMI were contradictory. Most studies have not observed an association between fT4 and BMI, although there are studies that have reported negative and even positive association between fT4 and BMI in the general population (Table 1). Many studies that investigated the influence of BMI on TSH and thyroid hormone levels involved a large number of participants, so sufficient statistical power was reached in these studies. Although for TSH and fT3, there was some consistency of results between studies, this was not observed for fT4. When only studies with a large number of participants (above 1000) were considered, most studies reported a negative correlation between BMI values and fT4 levels (Table 1). The relationship between thyroid hormone levels and weight is well understood in autoimmune disorders. Hyperthyroidism is accompanied by weight loss while hypothyroidism is associated with weight gain. However, the reason for variation in TSH and thyroid hormone levels in euthyroid individuals after an increase in their BMI is not very well understood. Several hypotheses have been proposed. Adipose tissue secretes the hormone leptin which is also involved in the production of hypothalamic TRH (and consequently the production of pituitary TSH). There is a positive correlation between leptin levels and BMI, so this could be a good explanation for why TSH levels increase with increasing BMI. However, some authors think that changes in TSH levels and levels of thyroid hormones are the cause, not the consequence, of an increase in BMI. They propose that lower thyroid function can lead to obesity, probably as a result of a lower metabolic rate. In fact, thyroid hormones have even been used to treat obesity in the past, although due to numerous side effects, this weight loss method has been discarded. It has also been speculated that the increase in TSH levels in obesity is a consequence of hormone resistance. This hypothesis could explain why both TSH and T3 levels are increased in obesity. Since T3 receptors are reduced in obesity, this could lead to decreased negative feedback between TSH and thyroid hormones and consequently an increase in both TSH and T3 levels. It has also been hypothesized that alterations in TSH and thyroid hormone levels in obesity are due to the process of adjustment to weight gain or subclinical hypothyroidism.

3.1.4. Diet

In this section, we discuss how diet can alter TSH and thyroid hormone levels. We do not discuss the well-known dietary iodine deficiency considered to be the most common cause of hypothyroidism in the world, as iodine deficiency has decreased dramatically due to the salt iodization programs. We discuss other components in diet that can change the levels of TSH and thyroid hormones, such as soy, brassica vegetables, food associated with the development of endemic goiter, beverages (coffee and tea), other food (junk food, seaweed, spices) and micronutrients (vitamins, trace minerals and macrominerals). It is important to point out that cyanogenic glucosides (reviewed in) and flavonoids (reviewed in) found in a wide range of plant-based food can alter TSH and thyroid hormone levels. Although there are many indications that a particular type of food affects thyroid function, an insufficient number of studies on this issue have been conducted so far. The majority of the studies have investigated the influence of soy-based food on TSH and thyroid hormone levels.

Soy

The possible antithyroid effect of soy-based food (soy, tofu, edamame, miso and soy milk) has long been of scientific concern. The goitrogenic compounds found in soy are soy isoflavones, a subclass of flavonoids. Isoflavones are also found in red clover and linseeds. Isoflavones inhibit TPO, an enzyme involved in the synthesis of thyroid hormones. Many in vitro and in vivo studies have shown that soy isoflavones have a negative effect on thyroid function. Human studies have shown that soy-fed infants developed goiter. A recent meta-analysis of human studies showed that soy supplementation did not affect thyroid hormone levels and only modestly raised TSH levels. Most human studies have not shown the effect of soy food and goitrogenic compounds found in soy on TSH and thyroid hormone levels. Some studies however have noticed an increase in TSH levels after consuming soy food or soy isoflavones. Moreover, an increase and a decrease in fT4 levels and an increase and a decrease in fT3 levels after consumption of soy food or soy isoflavones were observed (Table 1). However, the majority of these studies were underpowered, and additional studies with a larger number of participants are needed to elucidate the influence of soy food and soy isoflavones on TSH and thyroid hormone levels. De Souza dos Santos et al., hypothesized that compared to the other species, the bioavailability of flavonoids to the human thyroid gland may be limited (due to less intestinal absorption and greater hepatic metabolism). This could explain the less deleterious effect of soy isoflavones on thyroid function in humans compared to experimental animals. However, these authors and others pointed out that soy food and soy isoflavones may have a possible negative effect on thyroid in vulnerable groups, such as people with subclinical hypothyroidism, with iodine deficiency (for example during pregnancy) and with thyroid disorders.

Brassica Vegetables

There is much evidence that compounds found in brassica vegetables (also known as cruciferous vegetables) can have a goitrogenic effect. Brassica vegetables include broccoli, cabbage, cauliflower, rutabaga, choy sum and turnip. Two compounds identified in brassica vegetables with the potential to have a goitrogenic effect are thiocyanate and goitrin. Thiocyanate and goitrin are produced by myrosinase-induced degradation of indole glucosinolates and progoitrin, respectively. Goitrin inhibits iodine uptake by the thyroid gland. Thiocyanate also reduces iodine uptake by the thyroid since thiocyanate is a competitive inhibitor of NIS. However, human studies have shown no effect of brassica vegetables on TSH and thyroid hormone levels so far (Table 1).

Olive Oil

Many experimental studies have shown that olive derivatives, especially olive oil, have a stimulating effect on the thyroid gland (reviewed in). The experimental studies were performed on various animal models: rats, chicken, lambs, goats and calves. The mechanism by which olive derivatives and olive oil affect the TSH and thyroid hormone levels is still unclear. To our knowledge, only one study in humans has shown the effect of olive oil consumption on thyroid hormone levels. Zupo et al., showed that people consuming olive oil have lower levels of fT3 and fT4. They also observed that the Mediterranean diet, rich in olive oil, slightly inhibits the production of fT3 and fT4 without significantly affecting thyroid function.

Food Associated with the Development of Endemic Goiter

Millet. The flavonoid C-glycosylflavone found in the pearl millet (Pennisetum glaucum) inhibited 85% of the TPO enzyme. Pearl millet is a staple food for many people in rural areas of Asia and Africa. Animal studies and epidemiological evidence suggested that pearl millet may contribute to the development of endemic goiter in areas where this nutrient is consumed. Sartelet et al., proposed that flavonoids present in fonio millet (Digitaria exilis) (apigenin and luteolin) also have an antithyroid effect.

Cassava. Consumption of cassava (Manihot esculenta) has been reported to have contributed to the development of endemic goiter in tropical areas where its starchy tuberous root is consumed as staple food. Linamarin, a cyanogenic glucoside, is thought to be metabolized from cassava to thiocyanate, which reduces iodine uptake by the mechanism previously described.

Bamboo Shoots. Consumption of bamboo shoots contributes to the development of endemic goiter. Cyanogenic glycosides present in bamboo shoots are metabolized to toxic thiocyanate. Additionally, the in vitro study of Sarkar et al., showed that cyanogenic constituents in bamboo shoots generate reactive oxidative species that contribute to oxidative DNA damage and cell cycle disruption. This is followed by the inhibition of regulatory elements that synthesize thyroid hormones.

Other Food

Seaweeds. Seaweeds are frequently used in cuisine in Asian countries. They include different types of algae (green, red and brown) that are accumulators of iodine from the ocean. For example, kelps (the largest of the brown seaweeds) are the main accumulators of iodine in the ocean. While iodine deficiency causes hypothyroidism, iodine excess can cause both hyperthyroidism and hypothyroidism. Studies in euthyroid humans have observed an increase in TSH levels after seaweed consumption (Table 1). However, Noahsen et al., observed a transient 150% increase in TSH levels in euthyroid individuals after consumption of seaweed (while fT4 levels remained unchanged) that returned to normal within three days. Consumption of seaweed also increased urinary iodine excretion. Miyai et al., also observed an increase in TSH levels after consumption of seaweed “Kombu”, but these levels returned to normal after some time. Additionally, our recent study showed that consumption of seafood (different types of fish and squid) leads to an increase in fT4 and fT3 levels (Table 1).

Junk Food. There is evidence that intake of non-home-made meals alters thyroid hormone levels. Consumption of such food increases weight (BMI) and insulin levels. The alteration in TSH and thyroid hormone levels after an increase in BMI is discussed in the previous section. An increase in thyroid hormone levels was also observed after consumption of white bread and pasta, while consumption of whole-grain bread leads to a decrease in fT4 levels. Additionally, it was showed that consumption of bacon and sausages lead to an increase in fT3 and fT4 levels.

Spices. There are proofs from animal studies that some spices can alter thyroid hormone levels. Thus, piperine (the main alkaloid found in black pepper) has been shown to reduce thyroid hormone levels in mice. Cinnamon has also been shown to reduce tT3 levels in rats.

Beverages

Tea. Chandra et al., showed that green and black tea extracts have antithyroid potential. It has been shown that catechins (flavonoids found in abundance in tea) have a goitrogenic effect in rats. An in vitro study showed that exposure to catechins affected thyroid hormone synthesizing enzymes, leading to a decrease in the activity of TPO and 5′-deiodinase I. However, Hu et al., pointed out that there was insufficient evidence of a possible antithyroid effect of catechins in humans. Although perchlorate (a chemical that interferes with thyroid hormone production) was detected in tea samples, it was concluded that exposure to perchlorate due to tea consumption was too low to have a negative health outcome.

Coffee. Evidence indicates that caffeine blocks the absorption of thyroid hormone replacement therapy (levothyroxine) in patients with hypothyroidism. Although these results have suggested a possible interaction of caffeine with the thyroid hormone system, few studies have been conducted to date on this issue. The results of studies on the effect of caffeine on thyroid hormone levels in experimental animals were inconsistent; generally, the existence of a transitory effect of caffeine on the thyroid hormone system with a possible tolerance-related outcome was observed. So far, few human studies have been conducted. Spindel et al., observed no effect of coffee consumption on TSH and T3 levels, while Friedrich et al., observed a positive association between urinary trigonelline levels (a marker of coffee consumption) and fT4 levels. The concentration of 3,5-T2, which is a metabolic product of T4 degradation, was positively associated with trigonelline levels. In addition, 3,5-T2 levels were associated with levels of other compounds in plasma that indicate coffee consumption (caffeine, theophylline, paraxanthine and 1-methylxanthine; trigonelline, pyroglutamate and hippurate).

Micronutrients (Vitamins, Trace Minerals, Macrominerals)

Many micronutrients have been shown to have an effect on TSH and thyroid hormone levels. Among vitamins, vitamin D has been the most studied. Moreover, many trace minerals have been shown to have an effect on thyroid function, including selenium, zinc, iron, copper and iodine. Many studies have investigated the effect of micronutrients on TSH and thyroid hormone levels (Table 1). However, it is difficult to draw a general conclusion about how certain micronutrient affects thyroid function due to a high degree of variation between results. These inconsistencies between the results are likely due to the majority of the studies involved being underpowered. Additional studies involving larger cohorts should be conducted.

Vitamin D. Vitamin D exerts its effect by binding to the vitamin D receptor (VDR). It is mainly synthesized in the skin when exposed to sunlight (95%), and only a small amount is taken from food (5%). VDRs are detected in the pituitary gland, and it is thought that in addition to other pituitary hormones, vitamin D also regulates TSH secretion. In addition, VDRs were detected in cultured rat-derived thyrocytes. The decrease in TSH levels present in the higher status of vitamin D is thought to be the result of an increase in thyroid hormone levels (that is the result of the stimulatory effect of vitamin D on thyrocytes). Many studies have shown an association between vitamin D deficiency and autoimmune thyroid diseases. Additionally, a positive correlation between TSH and vitamin D levels was observed in a study including pregnant women, while fT3 and fT4 levels were negatively correlated with vitamin D levels. These authors suggested that pregnant women diagnosed with transient hyperthyroidism should also be tested for possible vitamin D deficiency. Interestingly, Barchetta et al., suggested that vitamin D influences circannual variation in TSH levels and that seasonal variability in TSH levels in euthyroid individuals depends on vitamin D levels. Studies on the association between vitamin D levels and TSH and thyroid hormone levels in euthyroid individuals have generally observed a negative correlation between vitamin D levels and TSH and thyroid hormone levels (Table 1).

Other vitamins. A deficiency of other vitamins such as vitamin A, vitamin B12, vitamin B6 and vitamin E has also been observed in thyroid diseases. Supplementation with vitamin C and E, vitamin A, vitamin B12 and vitamin B6 (reviewed in) has been suggested to improve thyroid health. The influence of a deficiency of these vitamins on TSH and thyroid hormone levels in euthyroid individuals has not been well studied.

Selenium. Selenium is an essential trace element that is crucial for the normal functioning of many proteins and enzymes. It is taken from food, mainly meat, grains and seafood. The content of selenium in food is determined by its content in the soil. Thus, some regions with low selenium content in the soil use selenium-rich fertilizers to increase the selenium content in the soil and consequently the intake of selenium by the plants. Selenium is important for the functioning of many enzymes (selenoproteins) involved in the synthesis and metabolism of thyroid hormones and protection against oxidative damage (such as iodothyronine deiodinases, thioredoxin reductases and glutathione peroxidases). In fact, compared to other organs, the thyroid gland has a high concentration of selenium. Many studies have observed selenium deficiency among patients with benign thyroid diseases. Thus, selenium supplementation is used to treat various autoimmune thyroid diseases (reviewed in). Most studies in healthy individuals have observed an inverse relationship between selenium concentration and fT4 levels. Regarding TSH and fT3, most studies did not observe significant changes in these hormones after selenium intake (Table 1). It is important to point out that in addition to selenium deficiency, selenium excess is also not good for health. Exposure to high levels of selenium can cause selenosis (when selenium intake is above 850 μg/day).

Zinc. Zinc is the second most abundant trace element in the human body and has structural, catalytic and regulatory roles. Zinc is found in meat, milk and fish. Zinc is involved in the synthesis of TSH (since it participates in the synthesis of TRH (as part of zinc-dependent enzyme carboxypeptidase that converts pre-TRH to pro-TRH)) and the synthesis of thyroid hormones (as a cofactor of Dio1 and Dio2 and also as part of thyroid transcription factor 2 (zinc-finger protein) that is involved in the transcription of Tg and TPO genes). Zinc is also important for the proper functioning of T3 because T3 nuclear receptors contain zinc ions. Significantly lower zinc levels have been reported in patients with hypothyroidism, and some studies have shown a beneficial effect of zinc supplementation on thyroid hormone levels (reviewed in). Studies on the association between zinc levels and TSH and thyroid hormone levels in euthyroid individuals mostly observed no association between zinc and TSH levels (Table 1), negative correlation or no association between T4 and zinc levels or positive correlation or no association between T3 and zinc levels.

Iron. Iron is the most abundant trace element in the human body and is crucial for various cellular functions. Red meat, poultry, fish, leafy greens vegetables, lentils and beans are all rich in iron. Iron is involved in the synthesis of thyroid hormones, and its deficiency can alter thyroid hormone levels in several ways: (1) iron deficiency can reduce TPO activity; (2) iron deficiency can increase rT3 deiodination, leading to thyroid hormone metabolism by inactivating pathway; and (3) iron deficiency can lead to inefficient erythropoiesis, consequently causing a decrease in oxygen transport to tissues. Oxygen is crucial for various enzymatic reactions (including thyroid hormone synthesis). In a study conducted on 42,162 individuals, Wopereis et al., observed a higher chance of anemia in patients with hypothyroidism and hyperthyroidism. In their meta-analysis, Talebi et al., observed decreased iron levels in patients with subclinical hypothyroidism. Consistent with this finding, another study conducted on 1764 pregnant women showed an increase in TSH levels and a decrease in fT4 levels in the iron deficiency group. Although few, studies in euthyroid individuals mainly observed a decrease in thyroid hormone levels and no change in TSH levels in patients with anemia or iron deficiency (Table 1).

Copper. Copper is crucial for the normal functioning of many body functions and is an important component of many enzymes. It is also involved in the normal functioning of the thyroid gland and the production of thyroid hormones. Reducing copper levels can increase oxidative stress in thyrocytes because copper is a component of superoxide dismutase that protects cells from oxidative stress. It has also been observed that blood copper levels can change according to thyroid function. Although some studies have indicated a link between copper imbalance and benign thyroid diseases, a recent meta-analysis by Talebi et al., showed that there was no significant difference in the copper levels between hypothyroid patients and healthy controls. Although few, studies in euthyroid individuals have observed a positive correlation between copper levels and T4 and tT3 levels.

Iodine excess. It is well known that iodine deficiency disrupts the normal functioning of the thyroid gland, but, on the other hand, high iodine intake can also cause thyroid problems. Although most healthy people tolerate high iodine intake well, in vulnerable individuals, it can lead to the development of hyperthyroidism and even hypothyroidism (reviewed in). Causes of excess iodine are the consumption of overiodized salt, seaweeds (as already mentioned), consumption of excess iodine through water and milk and taking diary supplements that contain iodine. Most studies investigating the effect of high iodine intake on TSH and thyroid hormone levels in healthy adults observed an increase in TSH levels and a decrease in the levels of thyroid hormones after excess iodine. Although only a few studies have been conducted, the pattern of TSH and thyroid hormone levels observed in these studies has shown consistency: an increase in TSH levels followed by a decrease in thyroid hormone levels (Table 1). This hormone profile is a characteristic of hypothyroidism.

Magnesium. Magnesium is an essential mineral involved in the functioning of more than 300 enzymes, among which are those important for the synthesis of thyroid hormones. Magnesium is absorbed mainly from magnesium-rich food such as leafy greens, nuts, whole grains and seeds. Some studies have shown a link between magnesium imbalance and benign thyroid diseases. However, the meta-analysis of Talebi et al., showed that there was no significant difference in magnesium levels between hypothyroid patients and healthy controls. The effect of magnesium deficiency on TSH and thyroid hormone levels in euthyroid individuals has not been well studied.

3.1.5. Exercise

Exercise affects the homeostasis of the body, the regulation of which involves the HPT axis. Thus, alterations in TSH and thyroid hormone levels were observed after exercise. Additionally, thyroid hormones are involved in the normal functioning of skeletal muscles and pulmonary, cardiac and vascular systems whose activity is significantly altered during the exercise. Many studies have measured TSH and thyroid hormone levels after exercise in healthy individuals, but it is difficult to draw any conclusions due to inconsistencies between studies (; Table 1). A recent study involving 2740 healthy individuals observed no changes in TSH and fT4 levels after exercise. Factors contributing to inconsistencies between studies are the physical status of the subjects, the intensity, duration and type of exercise, differences in age and gender among the subjects and even the ambient temperature.

3.2.1. Chemicals

Many industrial chemicals and pesticides can alter the normal functioning of the thyroid gland. These chemicals are classified as endocrine-disrupting compounds (EDCs). Because thyroid hormones are crucial in normal brain development, any compound that could potentially affect normal thyroid function should be thoroughly investigated. In fact, many studies on the impact of potential EDCs on normal thyroid function have included pregnant women, infants and young children. However, these studies are not discussed in this section, which only considers studies including a general healthy population. Although so far many studies have been conducted on the influence of different types of chemicals on TSH and thyroid hormone levels, there is still a high degree of variation between the results. The majority of conducted studies were underpowered, not including a sufficient number of participants (Table 2). In addition, exposure of participants to different subtypes and doses of chemicals could contribute to the differences between the results. Therefore, it is difficult to draw a general conclusion about whether or how a particular chemical affects thyroid function.

Polychlorinated Biphenyls and Polybrominated Biphenyls

Polychlorinated biphenyls (PCBs) and polybrominated biphenyls (PBBs) are EDCs. Due to their structural similarities to thyroid hormones, PCBs and PBBs interfere with thyroid hormone signaling. An in vitro study showed that PCBs bind to thyroid hormone receptors, and PBBs could affect iodide intake by the thyroid gland. PCBs have been widely used as electrical insulating fluids and in carbonless copy paper, inks, paints and other industrial and consumer products. They were banned in the United States in 1979 and again by the Stockholm Convention on Persistent Organic Pollutants in 2001. However, these chemicals are persistent organic pollutants (POPs) that can accumulate in the environment and body fat and thus can still have detrimental effects on health. PBBs are also POPs and although they are still used as flame retardants (chemicals added to materials used to prevent potential ignition of products), their use is controlled by the 2003 Restriction of Hazardous Substances Directive. Many studies have investigated the influence of PCBs on thyroid hormone levels in healthy adults, but many inconsistencies have been observed between studies. Some studies have not observed the effect of PCBs on TSH and thyroid hormone levels. However, other studies have shown an increase and a decrease in TSH, an increase and a decrease in T3 and an increase and a decrease in T4 after exposure to PCBs. Although previous studies have investigated the effect of PBBs on the development of thyroid diseases, we have found only one study investigating the effect of PBBs on TSH and thyroid hormone levels in euthyroid individuals.

Polybrominated Diphenyl Ethers

Polybrominated diphenyl ethers (PBDEs) are used as flame retardants. Although, to date, the use of most types of PBDEs has been banned or restricted, these chemicals continue to pose a threat to human health because the Stockholm Convention on Persistent Organic Pollutants considers them to be POPs. These chemicals are also EDCs and share structural similarities with T4. The results of the studies on the influence of PBDEs on TSH and thyroid hormone levels in healthy adults were inconsistent. Some studies did not show an effect of PBDEs on TSH, T3 and T4 levels, while the others observed an increase in TSH, T3 and T4 levels and a decrease in TSH, T3 and T4 levels after PBDE exposure.

Bisphenol A

Bisphenol A (BPA) is one of the world’s most commonly used chemical in food packaging, food can lining, toys, tubes, cosmetics, etc. Because BPA is not chemically bound to the material, it can easily diffuse into food or beverages after repeated use, physical manipulation or under high heat. BPA inhibits thyroid hormone synthesis in several ways: it reduces thyroid iodide intake and TPO activity and alters gene expression for proteins involved in thyroid hormone synthesis (reviewed in). In addition, BPA is an antagonist of thyroid hormone receptors. Studies on the influence of BPA on TSH and thyroid hormone levels in healthy adults have yielded inconsistent results. TSH levels were not affected, increased or decreased after BPA exposure. T3 levels were also unaffected or increased by BPA exposure, while T4 levels were not affected or decreased by BPA exposure.

Phthalates

Phthalates are among the most produced chemicals in the world. They are used as plasticizers and softeners in products such as food packaging, food can lining, toys, tubes, cosmetics, etc. Because phthalates are not chemically bound to the material, they can easily diffuse into food, water and air. In vitro studies have shown that di-(2-ethylhexyl) phthalate (DEHP) has an antagonistic effect on thyroid hormone action. In addition, studies in rats have shown that DEHP causes histopathologic changes in the thyroid gland and increases the level of liver enzymes involved in the degradation of thyroid hormones (resulting in a decrease in thyroid hormone levels). Studies on the influence of phthalates on TSH and thyroid hormone levels in healthy adults have yielded inconsistent results. TSH levels were not affected or increased by exposure to phthalates. T3 levels were also not affected or decreased after phthalate exposure, while T4 levels were not affected, increased or decreased after phthalate exposure (Table 2).

Perchlorate

Perchlorate is a chemical substance used in the production of propellants, pyrotechnics, airbags and fertilizers and is approved as a food contact substance (therefore, it can be released into various foods, milk and water). Perchlorate reduces the intake of iodine in the thyroid because it is an inhibitor of NIS. Studies in healthy adults generally observed a decrease in T4 and T3 levels after exposure to perchlorate, while TSH levels were either not affected or increased (Table 2). Although only a few studies have been conducted so far, they have all included a sufficient number of participants. In addition, a similar pattern of TSH and thyroid hormone levels could be observed among studies: a decrease in thyroid hormone levels, with TSH levels remaining unchanged (Table 2). This indicates that perhaps perchlorate first exerts its effect on thyroid hormones.

Perfluoroalkyl Substances

Perfluoroalkyl substances (PFASs) can resist both water and oil and are therefore used as surfactants in products such as textiles, paints, food packaging, cookware and cosmetics. PFASs inhibit the synthesis and increase the metabolic excretion of thyroid hormones. Many studies have tested the effect of PFASs on thyroid hormone homeostasis in healthy adults. The results were inconsistent and showed no effect, increase or decrease in TSH levels after exposure to PFASs. No effect, increase or decrease in T3 levels and no effect, increase or decrease in T4 levels were observed after exposure to PFASs (Table 2).

Pesticides

Pesticides are EDCs, and various in vitro and in vivo studies have shown that pesticides, including insecticides, fungicides and herbicides, alter normal thyroid function (reviewed in). Pesticides affect the metabolism and production of thyroid hormones (reviewed in). The effect of various pesticides on TSH and thyroid hormone levels in healthy adults was tested (phenoxybenzoic acid (3-PBA) (metabolite of pyrethroid insecticide), trichloro-2-pyridinol (TCPY) (a metabolite of chlorpyrifos), cis and trans-3-2,2-dichlorovinyl-2,2-dimethylcyclopropane carboxylic acid (cis and trans-DCCA) (pyrethroid metabolites), 1-napththol (1N) (a metabolite of carbaryl and naphthalene), ethylene bisdithiocarbamate (EBDC) fungicides, insecticide fipronil sulfone metabolite, dithiocarbamate fungicides, lambda-cyhalothrin (pyrethroid), paraquat (herbicide), p,p′-dichlorodiphenyltrichloroethane (DDT), p,p′-diphenyldichloroethene (DDE), hexachlorobenzene (HCB), alpha-chlordane, endosulphan 2, methoxychlor, beta-hexachlorocyclohexane (HCH) and mancozeb (fungicide)) (Table 2). Some studies have compared TSH and thyroid hormone levels between conventional farmers (who use pesticides) and organic farmers. Studies have yielded inconsistent results. Pesticide use increased, decreased or had no effect on TSH levels. T4 levels either increased, decreased or did not change after pesticide use. The same was observed with T3: studies reported an increase, decrease or no change after pesticide use. Such variations in results are expected since different types of pesticides were analyzed.

Nitrate

Nitrate can occur naturally in vegetables grown in soil and in surface water and groundwater. However, due to excessive use of fertilizers, septic systems in rural areas, food processing waste and industrial waste, nitrate levels in the food and water can increase. Nitrate ion competitively binds to NIS, resulting in low iodine intake in the thyroid gland (reviewed in). Higher exposure to nitrate has even been associated with a higher risk of developing hypothyroidism. Studies examining the effect of nitrate on TSH and thyroid hormone levels in healthy adults have yielded inconsistent results. Some studies have observed a decrease, an increase or no change in TSH levels as a result of higher nitrate exposure. Moreover, a decrease, an increase or no change in T4 levels was observed as a result of higher nitrate exposure, while T3 levels did not correlate with nitrate levels.

3.2.2. Heavy Metals

Heavy metals such as arsenic (As), cadmium (Cd), lead (Pb) and mercury (Hg) are environmental toxins that interfere with the normal functioning of the thyroid gland. Arsenic has been shown to inhibit TPO activity. Cadmium affects TPO activity and alters thyroid hormone metabolism. Lead affects the intake of iodide in the thyroid gland and alters the metabolism of thyroid hormones. Mercury affects TPO activity and inhibits deiodinases involved in the metabolism of thyroid hormones. Various studies examining the effect of heavy metals on TSH and thyroid hormone levels in healthy adults have yielded inconsistent results. Arsenic exposure leads to an increase, decrease or no change in TSH levels. T4 levels decreased, while T3 levels either decreased or did not change after arsenic exposure. After cadmium exposure, an increase, a decrease or no change in TSH levels was observed. T4 levels increased, decreased or did not change after cadmium exposure. The same was observed for T3; an increase, decrease or no change after cadmium exposure. Lead exposure caused an increase, a decrease or no change in TSH levels. Likewise, an increase, a decrease or no change in T4 levels and an increase, a decrease or no change in T3 levels were observed after lead exposure. TSH levels were increased or unchanged after exposure to mercury. T4 levels were also increased, decreased or unchanged after exposure to mercury. Inconsistent results for T3 were also observed: studies reported an increase, a decrease or no change after mercury exposure (Table 2). The cause of variability between the studies was probably due to the fact that the participants were exposed to different doses of heavy metals. Moreover, the majority of conducted studies were underpowered. Therefore, additional studies with a larger number of participants are needed to elucidate the influence of heavy metals on TSH and thyroid hormone levels.

4. Conclusions

The scope of this review was to provide a comprehensive insight into the literature discussing the influence of environmental factors on TSH and thyroid hormone levels in healthy adults. We included lifestyle factors (smoking, alcohol consumption, diet and exercise) and pollutants (chemicals and heavy metals) (Figure 1). After analyzing the literature, we conclude that there is still a large variability in results between studies. The pollutant that showed the clearest relationship with thyroid hormones was perchlorate; most studies have noticed a decrease in thyroid hormone levels after exposure to perchlorate (Table 2). Lifestyle factors that showed the highest consistency in results between studies were smoking, BMI and iodine (micronutrient taken from the diet). Smoking leads to a decrease in TSH levels and an increase in T3 and T4 levels (Table 1). There was a positive correlation between BMI levels and TSH and fT3 levels (Table 1). In addition, an increase in TSH levels and a decrease in thyroid hormone levels were observed after excess iodine (Table 1). Future studies should continue to analyze the influence of environmental factors on thyroid function. Studies should involve a large number of participants and meta-analyses should also be conducted. More studies in this area will provide researchers with valuable information needed to understand the complex background of gene–environment interactions that underlie the development of thyroid disease.

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    Ye H., Ha M., Yang M., Yue P., Xie Z., Liu C. Di2-ethylhexyl phthalate disrupts thyroid hormone homeostasis through activating the Ras/Akt/TRHr pathway and inducing hepatic enzymes. Sci. Rep. 2017;7:1-12.

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    Huang H.-B., Pan W.H., Chang J.W., Chiang H.C., Guo Y.L., Jaakkola J.J.K., Huang P.C. Does exposure to phthalates influence thyroid function and growth hormone homeostasis? The Taiwan Environmental Survey for Toxicants (TEST) 2013. Environ. Res. 2017;153:63-72.

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    Mendez W., Eftim S.E. Biomarkers of perchlorate exposure are correlated with circulating thyroid hormone levels in the 2007–2008 NHANES. Environ. Res. 2012;118:137-144.

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    Suh M., Abraham L., Hixon J.G., Proctor D.M. The effects of perchlorate, nitrate, and thiocyanate on free thyroxine for potentially sensitive subpopulations o. The 2001–2002 and 2007–2008 National Health and Nutrition Examination Surveys. J. Expo. Sci. Environ. Epidemiol. 2014;24:579-587.

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    Sohn Y.S., Moon S., Park Y.J. Effect of multiple exposure to perfluorinated chemicals on thyroid function among adults in the US: The National Health and Nutrition Examination Survey 2007–2008 and 2011–2012. Int. J. Thyroidol. 2020;13:19-29.

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    Li Y., Xu Y., Fletcher T., Scott K., Nielsen C., Pineda D., Lindh C.H., Olsson D.S., Andersson E.M., Jakobsson K. Associations between perfluoroalkyl substances and thyroid hormones after high exposure through drinking water. Environ. Res. 2021;194:110647.

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    Van Gerwen M., Alpert N., Alsen M., Ziadkhanpour K., Taioli E., Genden E. The impact of smoking on the association between perfluoroalkyl acids (Pfas) and thyroid hormones: A national health and nutrition examination survey analysis. Toxics. 2020;8:116.

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    Kim M.J., Moon S., Oh B.C., Jung D., Ji K., Choi K., Park Y.J. Association between perfluoroalkyl substances exposure and thyroid function in adults: A meta-analysis. PLoS ONE. 2018;13:e0197244.

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    Serum Biomarkers of Exposure to Perfluoroalkyl Substances in Relation to Serum Testosterone and Measures of Thyroid Function among Adults and Adolescents from NHANES 2011–2012 · 2015
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    Lin C.Y., Wen L.L., Lin L.Y., Wen T.W., Lien G.W., Hsu S.H.J., Chien K.L., Liao C.C., Sung F.C., Chen P.C., et al. The associations between serum perfluorinated chemicals and thyroid function in adolescents and young adults. J. Hazard. Mater. 2013;244–245:637-644.

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    Olsen G.W., Burris J.M., Burlew M.M., Mandel J.H. Epidemiologic assessment of worker serum perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) concentrations and medical surveillance examinations. J. Occup. Environ. Med. 2003;45:260-270.

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    Ji K., Kim S., Kho Y., Paek D., Sakong J., Ha J., Kim S., Choi K. Serum concentrations of major perfluorinated compounds among the general population in Korea: Dietary sources and potential impact on thyroid hormones. Environ. Int. 2012;45:78-85.

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    Byrne S.C., Miller P., Seguinot-Medina S., Waghiyi V., Buck C.L., Von Hippel F.A., Carpenter D.O. Exposure to perfluoroalkyl substances and associations with serum thyroid hormones in a remote population of Alaska Natives. Environ. Res. 2018;166:537-543.

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    Campos É., Freire C. Exposure to non-persistent pesticides and thyroid function: A systematic review of epidemiological evidence. Int. J. Hyg. Environ. Health. 2016;219:481-497.

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    Pesticides With Potential Thyroid Hormone-Disrupting Effects: A Review of Recent Data · 2019
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    McKinlay R., Plant J.A., Bell J.N.B., Voulvoulis N. Endocrine disrupting pesticides: Implications for risk assessment. Environ. Int. 2008;34:168-183.

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    Nankongnab N., Kongtip P., Kallayanatham N., Pundee R., Yimsabai J., Woskie S. Longitudinal study of thyroid hormones between conventional and organic farmers in Thailand. Toxics. 2020;8:82.

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    Steenland K., Cedillo L., Tucker J., Hines C., Sorensen K., Deddens J., Cruz V. Thyroid hormones and cytogenetic outcomes in backpack sprayers using ethylenebis(dithiocarbamate) (EBDC) fungicides in Mexico. Environ. Health Perspect. 1997;105:1126-1130.

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    Garry V.F., Holland S.E., Erickson L.L., Burroughs B.L. Male reproductive hormones and thyroid function in pesticide applicators in the Red River Valley of Minnesota. J. Toxicol. Environ. Health Part A. 2003;66:965-986.

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    Meeker J.D., Barr D.B., Hauser R. Thyroid hormones in relation to urinary metabolites of non-persistent insecticides in men of reproductive age. Reprod. Toxicol. 2006;22:437-442.

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    Lacasaña M., López-Flores I., Rodríguez-Barranco M., Aguilar-Garduño C., Blanco-Muñoz J., Pérez-Méndez O., Gamboa R., Bassol S., Cebrian M.E. Association between organophosphate pesticides exposure and thyroid hormones in floriculture workers. Toxicol. Appl. Pharmacol. 2010;243:19-26.

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    Fortenberry G.Z., Hu H., Turyk M., Barr D.B., Meeker J.D. Association between urinary 3, 5, 6-trichloro-2-pyridinol, a metabolite of chlorpyrifos and chlorpyrifos-methyl, and serum T4 and TSH in NHANES 1999–2002. Sci. Total Environ. 2012;424:351-355.

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    Freire C., Koifman R.J., Sarcinelli P.N., Simões Rosa A.C., Clapauch R., Koifman S. Long-term exposure to organochlorine pesticides and thyroid status in adults in a heavily contaminated area in Brazil. Environ. Res. 2013;127:7-15.

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    Farokhi F., Taravati A. Pesticide exposure and thyroid function in adult male sprayers. Int. J. Med. Investig. 2014;3:127-132.

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    Langer P., Tajtaková M., Kocan A., Vlcek M., Petrik J., Chovancova J., Drobna B., Jursa S., Pavuk M., Trnovec T., et al. Multiple organochlorine pollution and the thyroid. Endocr. Regul. 2006;40:46-52.

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    Herin F., Boutet-Robinet E., Levant A., Dulaurent S., Manika M., Galatry-Bouju F., Caron P., Soulat J.M. Thyroid function tests in persons with occupational exposure to fipronil. Thyroid. 2011;21:701-706.

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    Bernieri T., Rodrigues D., Barbosa I.R., Ardenghi P.G., Basso da Silva L. Occupational exposure to pesticides and thyroid function in Brazilian soybean farmers. Chemosphere. 2019;218:425-429.

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    Sala M., Sunyer J., Herrero C., To-Figueras J., Grimalt J. Association between serum concentrations of hexachlorobenzene and polychlorobiphenyls with thyroid hormone and liver enzymes in a sample of the general population. Occup. Environ. Med. 2001;58:172-177.

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    Langer P., Kočan A., Tajtáková M., Rádiková Ž., Petrík J., Koška J., Kšinantová L., Imrich R., Hučková M., Chovancová J., et al. Possible effects of persistent organochlorinated pollutants cocktail on thyroid hormone levels and pituitary-thyroid interrelations. Chemosphere. 2007;70:110-118.

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    Schell L.M., Gallo M.V., Denham M., Ravenscroft J., DeCaprio A.P., Carpenter D.O. Relationship of thyroid hormone levels to levels of polychlorinated biphenyls, lead, p,p′-DDE, and other toxicants in Akwesasne Mohawk Youth. Environ. Health Perspect. 2008;116:806-813.

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    Meeker J.D., Barr D.B., Hauser R. Pyrethroid insecticide metabolites are associated with serum hormone levels in adult men. Reprod. Toxicol. 2009;27:155-160.

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    Miranda-Contreras L., Gómez-Pérez R., Rojas G., Cruz I., Berrueta L., Salmen S., Colmenares M., Barreto S., Balza A., Zavala L., et al. Occupational exposure to organophosphate and carbamate pesticides affects sperm chromatin integrity and reproductive hormone levels among venezuelan farm workers. J. Occup. Health. 2013;55:195-203.

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    Khan D.A., Ahad K., Ansari W.M., Khan H. Pesticide exposure and endocrine dysfunction in the cotton crop agricultural workers of Southern Punjab, Pakistan. Asia-Pac. J. Public Health. 2013;25:181-191.

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    Jain R. Association between thyroid function and urinary levels of 3,5,6-trichloro-2-pyridinol: Data from NHANES 2007–2008. Environ. Sci. Pollut. Res. 2017;24:2820-2826.

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    Medda E., Santini F., De Angelis S., Franzellin F., Fiumalbi C., Perico A., Gilardi E., Mechi M.T., Marsili A., Citroni A., et al. Iodine nutritional status and thyroid effects of exposure to ethylenebisdithiocarbamates. Environ. Res. 2017;154:152-159.

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    Hwang M., Lee Y., Choi K., Park C. Urinary 3-phenoxybenzoic acid levels and the association with thyroid hormones in adults: Korean National Environmental Health Survey 2012–2014. Sci. Total Environ. 2019;696:133920.

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    Jain R.B. Variability in the levels of 3-phenoxybenzoic acid by age, gender, and race/ethnicity for the period of 2001–2002 versus 2009–2010 and its association with thyroid function among general US population. Environ. Sci. Pollut. Res. 2016;23:6934-6939.

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    Panganiban L.R., Cortes-Maramba N., Dioquino C., Suplido M.L., Ho H., Francisco-Rivera A., Manglicmot-Yabes A. Correlation between blood enthylenethiourea and thyroid gland disorders among banana plantation workers in the Philippines. Environ. Health Perspect. 2004;112:42-45.

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    Rashidi M.A., Mahabadi H., Khavanin A. Evaluation of the effects of chronic exposure to organophosphorus pesticides on thyroid function. Asia Pac. J. Med. Toxicol. 2020;9:35-43.

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    Toft G., Flyvbjerg A., Bonde J.P. Thyroid function in Danish greenhouse workers. Environ. Health Glob. Access Sci. Source. 2006;5:32.

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    Blanco-Muñoz J., Lacasaña M., López-Flores I., Rodríguez-Barranco M., González-Alzaga B., Bassol S., Cebrian M.E., López-Carrillo L., Aguilar-Garduño C. Association between organochlorine pesticide exposure and thyroid hormones in floriculture workers. Environ. Res. 2016;150:357-363.

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    Bloom M.S., Jansing R.L., Kannan K., Rej R., Fitzgerald E.F. Thyroid hormones are associated with exposure to persistent organic pollutants in aging residents of upper Hudson River communities. Int. J. Hyg. Environ. Health. 2014;217:473-482.

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    Santos R., Piccoli C., Cremonese C., Freire C. Thyroid and reproductive hormones in relation to pesticide use in an agricultural population in Southern Brazil. Environ. Res. 2019;173:221-231.

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    Zaidi S.S., Bhatnagar V.K., Gandhi S.J., Shah M.P., Kulkarni P.K., Saiyed H.N. Assessment of thyroid function in pesticide formulators. Hum. Exp. Toxicol. 2000;19:497-501.

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    Pelletier C., Doucet E., Imbeault P., Tremblay A. Associations between weight loss-induced changes in plasma organochlorine concentrations, serum T3 concentration, and resting metabolic rate. Toxicol. Sci. 2002;67:46-51.

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    García Torres E., Pérez Morales R., González Zamora A., Ríos Sánchez E., Olivas Calderón E.H., Alba Romero J.d.J., Calleros Rincón E.Y. Consumption of water contaminated by nitrate and its deleterious effects on the human thyroid gland: A review and update. Int. J. Environ. Health Res. 2020;1-18.

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    Ward M.H., Kilfoy B.A., Weyer P.J., Anderson K.E., Folsom A.R., Cerhan J.R. Nitrate intake and the risk of thyroid cancer and thyroid disease. Epidemiology. 2010;21:389-395.

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    Modeled nitrate levels in well water supplies and prevalence of abnormal thyroid conditions among the Old Order Amish in Pennsylvania · 2012
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    Van Maanen J.M.S., van Dijk A., Mulder K., de Baets M.H., Menheere P.C.A., van der Heide D., Mertens P.L.J.M., Kleinjans J.C.S. Consumption of drinking water with high nitrate levels causes hypertrophy of the thyroid. Toxicol. Lett. 1994;72:365-374.

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    Bivolarska A.V., Maneva A.I., Gatseva P.D., Katsarova M.N. Effect of nitrates, thiocyanates and selenium on the iron and iodine status of postpartum women. Folia Med. 2016;58:188-194.

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    Lambers A., Koppeschaar H., van Isselt J., Schothorst R., Mensinga T., Meulenbelt J. The Effect of Nitrate on the Thyroid Gland Function in Healthy Volunteers in a 4-Week Oral Toxicity Study. Rijksinst voor Volksgezond en Milieu. 2000;61.

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    Dos Santos Pinheiro V., Volino-Souza M., Vieira de Oliveira G., Adam Conte-Junior C., Silveira Alvares T. Effect of high-nitrate beetroot juice consumption on thyroid gland hormones and iodine levels in adults. Food Biosci. 2021;40:100869.

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    Palazzolo D.L., Jansen K.P. The minimal arsenic concentration required to inhibit the activity of thyroid peroxidase activity in vitro. Biol. Trace Elem. Res. 2008;126:49-55.

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    Ghosh N., Bhattacharya S. Thyrotoxicity of the chlorides of cadmium and mercury in rabbit. Biomed. Environ. Sci. 1992;236-240.

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    Yoshida K., Sugihira N., Suzuki M., Sakurada T., Saito S., Yoshinaga K., Saito H. Effect of cadmium on T4 outer ring monodeiodination by rat liver. Environ. Res. 1987;42:400-405.

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    Chaurasia S.S., Gupta P., Kar A., Maiti P.K. Lead induced thyroid dysfunction and lipid peroxidation in the fish Clarias batrachus with special reference to hepatic type I-5′-monodeiodinase activity. Bull. Environ. Contam. Toxicol. 1996;56:649-654.

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    Soldin O.P., O’Mara D.M., Aschner M. Thyroid hormones and methylmercury toxicity. Biol. Trace Elem. Res. 2008;126:1.

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    Ciarrocca M., Tomei F., Caciari T., Cetica C., Andrè J.C., Fiaschetti M., Schifano M.P., Scala B., Scimitto L., Tomei G., et al. Exposure to Arsenic in urban and rural areas and effects on thyroid hormones. Inhal. Toxicol. 2012;24:589-598.

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    Molin M., Ulven S.M., Dahl L., Lundebye A.K., Holck M., Alexander J., Meltzer H.M., Ydersbond T.A. Arsenic in seafood is associated with increased thyroid-stimulating hormone (TSH) in healthy volunteers—A randomized controlled trial. J. Trace Elem. Med. Biol. 2017;44:1-7.

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    Jain R. Association between arsenic exposure and thyroid function: Data from NHANES 2007–2010. Int. J. Environ. Health Res. 2016;26:101-129.

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    Jurdziak M., Gać P., Poręba M., Szymańska-Chabowska A., Mazur G., Poręba R. Concentration of thyrotropic hormone in persons occupationally exposed to lead, cadmium and arsenic. Biol. Trace Elem. Res. 2018;182:196-203.

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    Rosati M.V., Montuori L., Caciari T., Sacco C., Marrocco M., Tomei G., Scala B., Sancini A., Anzelmo V., Bonomi S., et al. Correlation between urinary cadmium and thyroid hormones in outdoor workers exposed to urban stressors. Toxicol. Ind. Health. 2016;32:1978-1986.

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    Christensen Y.K.L. Metals in blood and urine, and thyroid function among adults in the United States 2007–2008. Int. J. Hyg. Environ. Health. 2013;216:624-632.

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    Thyroid Hormones in Relation to Lead, Mercury, and Cadmium Exposure in the National Health and Nutrition Examination Survey, 2007–2008 · 2012
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    Luo J., Hendryx M. Relationship between blood cadmium, lead, and serum thyroid measures in US adults—The National Health and Nutrition Examination Survey (NHANES) 2007–2010. Int. J. Environ. Health Res. 2014;24:125-136.

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    Jain R.B., Choi Y.S. Interacting effects of selected trace and toxic metals on thyroid function. Int. J. Environ. Health Res. 2016;26:75-91.

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    Mohammed Sherif M., Solyman Mohammed Y., Abd El-Moaty Zedan H., Abd El-hamid Kheder M., Hassan Abd EL-Salam Mohammed A., Author C. Toxic Effect of Some Heavy Metals (Cadmium and Lead) on Thyroid Function. Egypt. J. Hosp. Med. 2017;69:2512-2515.

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    Nie X., Chen Y., Chen Y., Chen C., Han B., Li Q., Zhu C., Xia F., Zhai H., Wang N., et al. Lead and cadmium exposure, higher thyroid antibodies and thyroid dysfunction in Chinese women. Environ. Pollut. 2017;230:320-328.

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    Akgöl E., Tutkun E., Yilmaz H., Yilmaz F., Gunduzoz M., Bal C., Ünlü A., Abusoglu S. Alterations of thyroid hormone levels in cadmium exposure. J. Clin. Anal. Med. 2017;8:202-206.

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    Chung S.M., Moon J.S., Yoon J.S., Won K.C., Lee H.W. Sex-specific effects of blood cadmium on thyroid hormones and thyroid function status: Korean nationwide cross-sectional study. J. Trace Elem. Med. Biol. 2019;53:55-61.

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    Nishijo M., Nakagawa H., Morikawa Y., Tabata M., Senma M., Miura K., Tsuritani I., Honda R., Kido T., Teranishi H., et al. A study of thyroid hormone levels of inhabitants of the cadmium-polluted Kakehashi River basin. Jpn. J. Hyg. 1994;49:598-605.

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    López C.M., Piñeiro A.E., Núñez N., Avagnina A.M., Villaamil E.C., Roses O.E. Thyroid hormone changes in males exposed to lead in the Buenos Aires Area (Argentina). Pharmacol. Res. 2000;42:599-602.

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    Singh B., Chandran V., Bandhu H.K., Mittal B.R., Bhattacharya A., Jindal S.K., Varma S. Impact of lead exposure on pituitary-thyroid axis in humans. BioMetals. 2000;13:187-192.

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    Pekcici R., Kavlakoğlu B., Yilmaz S., Şahin M., Delibaşi T. Effects of lead on thyroid functions in lead-exposed workers. Cent. Eur. J. Med. 2010;5:215-218.

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    Fahim Y.A., Sharaf N.E., Hasani I.W., Ragab E.A., Abdelhakim H.K. Assessment of thyroid function and oxidative stress state in foundry workers exposed to lead. J. Health Pollut. 2020;10:200903.

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    Schumacher C., Brodkin C.A., Alexander B., Cullen M., Rainey P.M., Van Netten C., Faustman E., Checkoway H. Thyroid function in lead smelter workers: Absence of subacute or cumulative effects with moderate lead burdens. Int. Arch. Occup. Environ. Health. 1998;71:453-458.

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    Tuppurainen M., Wagar G., Kurppa K., Sakari W., Wambugu A., Froseth B., Alho J., Nykyri E. Thyroid function as assessed by routine laboratory tests of workers with long-term exposure. Scand. J. Work. Environ. Health. 1988;14:175-180.

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    Erfurth E.M., Gerhardsson L., Nilsson A., Rylander L., Schütz A., Skerfving S., Börjesson J. Effects of lead on the endocrine system in lead smelter workers. Arch. Environ. Health. 2001;56:449-455.

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    Liang Q., Liao R., Su S., Huang S., Pan R., Huang J. Effects of lead on thyroid function of occupationally exposed workers. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi. 2003;21:111-113.

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    Dundar B., Öktem F., Arslan M.K., Delibas N., Baykal B., Arslan Ç., Gultepe M., Ilhan I.E. The effect of long-term low-dose lead exposure on thyroid function in adolescents. Environ. Res. 2006;101:140-145.

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    Soltani S., Sharifiyan A., Ghasemi M., Chavoshi F., Sadeghniiat K., Bahaedini L., Amlnian O., Meisami A.P. Assessment of thyroid function in male workers of battery recycling factory occupationally exposed to lead. J. Pharmacol. Toxicol. 2012;7:338-343.

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    Krieg E.F. A meta-analysis of studies investigating the effects of occupational lead exposure on thyroid hormones. Am. J. Ind. Med. 2016;59:583-590.

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    Dursun N., Tutus A. Chronic occupational lead exposure and thyroid function. J. Trace Elem. Exp. Med. 1999;12:45-49.

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    Saad-Hussein A., Hamdy H., Aziz H.M., Mahdy-Abdallah H. Thyroid functions in paints production workers and the mechanism of oxidative-antioxidants status. Toxicol. Ind. Health. 2011;27:257-263.

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    Thyroxine and Free Thyroxine Levels in Workers Occupationally Exposed to Inorganic Lead · 2011
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    Correia M.M., Chammas M.C., Zavariz J.D., Arata A., Martins L.C., Marui S., Pereira L.A.A. Evaluation of the effects of chronic occupational exposure to metallic mercury on the thyroid parenchyma and hormonal function. Int. Arch. Occup. Environ. Health. 2020;93:491-502.

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