Free triiodothyronine is associated with smoking habit, independently of obesity, body fat distribution, insulin, and metabolic parameters.

Journal of Endocrinological Investigation
G De PergolaP Guida

Abstract

The aim of this study was to examine the relationship between thyroid hormones and smoking and several other parameters like age, gender, insulin, and anthropometric and metabolic parameters in subjects with a wide range of body mass index (BMI). A total of 931 euthyroid normal weight (BMI<25.0 kg/m2), overweight and obese subjects (BMI ≥25.0 kg/m2), 663 women and 268 men, aged 18-68 yr, were investigated. Fasting TSH, free T3 (FT3), free T4 (FT4), insulin, glucose, and lipid serum levels were determined. Waist circumference was measured as an indirect parameter of central fat accumulation. Smokers were younger (p<0.001) and showed higher FT3 (p<0.01), and triglyceride (p<0.01) levels and lower glucose (p<0.01) and HDL (p<0.001) concentrations than non smoking subjects. FT3 levels were directly associated with BMI (p<0.001), waist circumference (p<0.001), insulin (p<0.001), and triglyceride (p<0.01) levels and negatively correlated with age (p<0.001) and HDL-cholesterol levels (p<0.001). When a multiple regression analysis was performed with FT3 levels as the dependent variable, and smoking, age, gender, and TSH, insulin, triglyceride, and HDL-cholesterol serum concentrations as independent variables, FT3 levels maintained an i...Continue Reading

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Citations

Aug 10, 2012·Thyroid : Official Journal of the American Thyroid Association·Tuija MännistöEila Suvanto
Dec 29, 2011·Internal and Emergency Medicine·Anna BoggioAdriana Branchi
Apr 16, 2013·Clinical Endocrinology·Wilmar M Wiersinga
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Nov 5, 2016·Thyroid : Official Journal of the American Thyroid Association·Ji Eun JunJae Hyeon Kim
Jul 3, 2021·International Journal of Molecular Sciences·Mirjana Babić LekoTatijana Zemunik

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