Abstract

OZER, Samet et al. Relationships among thyroid hormones and obesity severity, metabolic syndrome and its components in Turkish children with obesity. Nutr. Hosp. [online]. 2015, vol.32, n.2, pp.645-651. ISSN 1699-5198.  https://dx.doi.org/10.3305/nh.2015.32.2.9212.

Background: we investigated the relationships between thyroid function and obesity severity, metabolic syndrome (MS) and MS components in 260 obese children and adolescents 10-17 years of age. Objectives: we aimed to determine the association of thyroid functions with obesity severity and the components of metabolic syndrome (MS) in pediatric obese patients. Methods: only obese children and adolescents were included, and divided the obese children into three groups according to body mass index (BMI)-SDS quartiles. The first quartile was group 1, the second and third quartiles were group 2, and the fourth quartile was group 3. Group 3 indicated severe obesity. The modified WHO criteria adapted for children were used to diagnose MS. We assessed anthropometric data and serum biochemical parameters, including the lipid profile and fasting glucose (FG), insulin, thyroid-stimulating hormone (TSH), free thyroxine (fT4), and free triiodothyronine (fT3) levels. Blood pressure (BP) was measured with a standard digital sphygmomanometer. The homeostasis model assessment of insulin resistance was calculated to determine insulin resistance (IR). Results: TSH level was significantly higher in obese children with MS than that in the others (p = 0.045). Mean TSH level was not different among the BMI-SDS groups (p = 0.590). TSH levels and the fT3/fT4 ratio were not different in children with dyslipidemia, IR or hypertension (p = 0.515, 0.805, 0.973, 0.750, 0.515, and 0.805, respectively). Discussion: obesity severity does not affect TSH level or the fT3/fT4 ratio in obese children and adolescents. IR is in close relationship with TSH level. Elevated TSH level is a risk factor for MS.

Keywords : Obesity severity; Thyroid hormones; Metabolic syndrome.

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