Excessive abdominal adiposity and body fat are associated with lower serum vitamin D levels: A population-based study/Excesso de adiposidade abdominal e de gordura corporal se associa a menor concentracao serica de vitamina D: um estudo de base populacional

To estimate the prevalence of 25-hydroxyvitamin D deficiency and to analyze factors associated with lower serum vitamin levels in Brazilian adults. A cross-sectional, population-based study consisted of 626 adult individuals of both sexes living in the urban area of Vicosa, Minas Gerais. The dependent variable used was the serum level of 25-hydroxyvitamin D and the independent variables were sociodemographic, anthropometric and body composition variables. The associations among the variables were verified using simple and multiple linear regression models, considering alpha lower than 0.05 for the input in the final model. The prevalence of 25-hydroxyvitamin D deficiency was 14.4% and the prevalence was 42.0%. Excess abdominal fat was higher in subjects with 25-hydroxyvitamin D sufficiency. The serum level of 25-hydroxyvitamin D was 30.34[+ ou -]9.85ng/ml. Body adiposity was higher in men with vitamin insufficiency. Negative associations were observed between serum 25-hydroxyvitamin D levels and age, educational level, body adiposity (p=0.028) and abdominal adiposity (p=0.023). Our results showed that excess body and abdominal adiposity are strong predictors of alterations in the serum vitamin D levels, thus public policies for prevention and treatment in this population are essential. Estimar a prevalencia de deficiencia de 25 hidroxivitamina D e analisar fatores associados a menor concentracao serica da vitamina em adultos brasileiros. A prevalencia de deficiencia de 25 hidroxivitamina D foi de 14,4% e a insuficiencia de 42,0%. O excesso de gordura abdominal foi maior em individuos com suficiencia de 25 hidroxivitamina D. A concentracao serica de 25 hidroxivitamina D foi de 30,34[+ ou -]9,85 ng/ml. A adiposidade corporal foi maior em homens com insuficiencia. Foram verificadas associacoes negativas entre a concentracao serica de 25 hidroxivitamina D e a idade, a escolaridade, a adiposidade corporal (p=0,028) e a adiposidade abdominal (p=0,023).