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The aim of this article is to study the possible relation of serum vitamin D concentrations to body mass index (BMI), visceral fat thickness (VFT), insulin resistance (IR), inflammation (serum monocyte chemoattractant protein-1 – MCP-1) and thyroid parameters in obese patients. A total of 158 non-diabetic, obese patients aged 19–68 without a history of thyroid pathology were recruited. Biochemical markers, insulin, 25-OH vitamin D, thyroid parameters (TSH, FT3, FT4, TPO antibodies, TG antibodies) and VFT were measured. Serum MCP-1 evaluated the inflammation. A HOMA-IR cut-off value of 2.5 defined IR. Most patients had severe (70.3%) or moderate (25.3%) vitamin D deficiency. Vitamin D level was negatively associated with BMI (p = .043) and during the cold season with VFT (p = .009). Vitamin D deficiency correlated with Hashimoto’s thyroiditis prevalence during the warm season (p = .047) and was a …