ABSTRACT
Background: vitamin D deficiency has a strong association with insulin resistance and NAFLD.Objective: to assess vitamin D levels in patients having type2 diabetes with NAFLD and to study its relationship withinsulin resistance. Patients and methods: a casecontrol study conducted on 50 subjects who were divided into 2 groups: 35 patients having T2DM and NAFLD (group 1) and 15 healthy subjects served as control (group 2). Fasting plasma glucose (FBG), 2 hour post prandial (2hrpp), and fasting plasma insulin (FPI) were measured with calculation of HOMA-IR. Fasting lipids, Hb A1c, calcium, phosphorus, urea, creatinine, serum alanine aminotranseferase (ALT), aspartate aminotransaminase (AST) were also measured. BMI was calculated, serum 25 (OH)D was measured with ELISA and abdominal ultrasonography was done for all participant. Results: the study showed lower level of vitamin D in patients with T2DM and NAFLD 10.6 (5.5-21.3) as compared to control group 31 (27-39.7). While non-significant difference was found between male and female regarding 25(OH) D level and HOMA-IR. There was significant negative correlation between vitamin D level and HOMA-IR. Conclusion: Vitamin D level was associated with presence of NAFLD. There was strong relation between vitamin D level and insulin resistance as vitamin D deficiency was associated with higher levels of HOMA-IR. Obesity may be related to low vitamin D level, but no difference in VD level between males and females was found