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Background Obesity is a worldwide problem and is a major risk factor for chronic diseases. The relation between obesity and vitamin D is not completely understood. Obesity is associated with vitamin D insufficiency. Some studies claim that vitamin D may reduce lipogenesis and others claim that vitamin D can promote adipogenesis. Aim of the study This study was planned to evaluate the effect of alteration in vitamin D level on body weight and adipose tissue metabolism in an obese rat model. Methods 32 Female Albino-rats were randomly allocated into: control group (C, n = 8), fed on control diet containing 1000 IU vitamin D/kg diet, and a high caloric diet group (HCD, n = 32). The HCD group was further subdivided into 3 groups according to the vitamin D dose into: standard vitamin D dose group (HCD+SVD) containing 1000 IU vitamin D/kg diet, low vitamin D dose group (HCD+LVD) containing 25 IU vitamin D/kg diet and high vitamin D dose group (HCD+HVD) containing 5169 IU vitamin D/kg diet. Body mass index, serum vitamin D, glucose, lipid profile, TNF-α and adipose tissue UCP-1 were measured. Different fat depots were weighed and histopathologically assessed. Results HCD+HVD group showed a significant increase in the final body mass index and in the different fat depot weights compared to all groups. Compared to the HCD+SVD group, the HCD+HVD group showed significantly lower serum total cholesterol and LDL-c levels, while it showed a non-significant change in serum glucose, TNF-α and visceral adipose tissue UCP-1. A significant negative correlation was found between serum 25(OH)D and visceral adipose tissue UCP-1. HCD+LVD showed the highest visceral adipose tissue UCP-1 compared to all groups. Conclusion Vitamin D promoted adiposity and decreased visceral adipose tissue UCP-1 but improved the associated derangements in lipid profile.

Vitamin D Promotes Adiposity But Improves Associated Metabolic Derangements In An Obese Rat Model