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. 2022 Apr 11;11(8):2118.
doi: 10.3390/jcm11082118.

Body Composition and Serum Concentration of Thyroid Hormones in Euthyroid Men and Women from General Population

Agnieszka Adamska  1 , Andrzej Raczkowski  2 , Zofia Stachurska  2 , Marcin Kondraciuk  2 , Adam Jacek Krętowski  1   3 , Marcin Adamski  4 , Irina Kowalska  5 , Karol Adam Kamiński  2
Affiliations

Body Composition and Serum Concentration of Thyroid Hormones in Euthyroid Men and Women from General Population

Agnieszka Adamska et al. J Clin Med. .

Abstract

Body composition, especially an increased amount of fat mass and decreased lean body mass, is connected with metabolic complications. Thyroid hormones can influence body composition pattern. To date, scarce data defining the relationships between thyroid hormones and parameters of body composition using dual-energy X-ray absorptiometry (DXA), especially in cohort studies, are available. Therefore, the aim of the present study was to investigate the relationships among serum concentrations of (thyroid-stimulating hormone (TSH), thyroid hormones, and distribution of fat tissue assessed using the DXA method in a euthyroid cohort from the Białystok PLUS study. We examined 582 euthyroid subjects who were divided into lean (body mass index (BMI) < 25 kg/m2) and overweight/obese (BMI ≥ 25 kg/m2) (84 lean men, 182 overweight/obese men, 160 lean women, and 156 overweight/obese women). Serum concentrations of TSH, free T3 (fT3), and free T4 (fT4) were assessed, and DXA was performed. We observed lower serum levels of fT4 (p = 0.03) and higher serum levels of fT3 (p = 0.04) in overweight/obese vs. lean men, whereas serum levels of TSH did not differ between these groups (p = 0.38). In lean men, we only observed a relationship between serum levels of TSH and visceral adipose tissue (VAT) (r = −0.24, p = 0.02). In overweight/obese men, we found that serum levels of fT3 were positively connected with total fat mass (r = 0.16, p = 0.02), android fat mass (r = 0.15, p = 0.03), and gynoid fat mass (r = 0.17, p = 0.01), but not with VAT (r = 0.03, p = 0.63). We did not observe differences in serum levels of TSH, fT3, and fT4 between lean and overweight/obese women. Additionally, we did not notice relationships between serum levels of thyroid hormones and fat in different regions estimated by DXA in lean and overweight/obese women (all p > 0.05). We concluded that the serum concentration of TSH is connected with VAT in lean men, whereas, in overweight/obese men, higher fT3 is connected with an increased fat amount. These associations are absent in women.

Keywords: body composition; cohort study; thyroid hormones.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Serum levels of TSH (a), fT3 (b), and fT4 (c) in overweight/obese women (n = 149) and lean (n = 160) women.
Figure 2
Figure 2
Serum levels of TSH (a), fT4 (b), and fT3 (c) in lean (n = 84) vs. overweight/obese men (n = 175).
See this image and copyright information in PMC

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