Background Non-alcoholic fatty liver disease (NAFLD) is prevalent in individuals with type 2 diabetes mellitus (T2DM). Diabetic nephropathy (DN) is also associated with T2DM. However, little is known about the interaction between these conditions in patients with T2DM. Objective To examine the association between NAFLD and DN in patients with T2DM. Methods This retrospective study included patients seen between January 2006 and July 2014. T2DM patients were divided into two groups based on NAFLD status (with NAFLD = group A; without = group B). The cumulative incidence of DN and chronic kidney disease (CKD) staging were compared between the two groups. Liver fat content was examined in some patients. Associations among NAFLD, other factors, and DN were analyzed by the additive interaction method. Results Cumulative incidence of DN in patients from group A (58.58%) was higher than in group B (37.22%) (P = 0.005). In both groups, the number of DN patients with CKD stage 1 was greater than the number of patients with stages 2-5. Increased liver fat content was associated with increased occurrence of severe and mild albuminuria and decreased glomerular filtration rate (GFR). There were positive correlations between NAFLD and insulin resistance index (HOMA-IR), free fatty acids (FFA), tumor necrosis factor-alpha (TNF-alpha), omentin-1, visceral fat area, homocysteine (HCY), and serum uric acid (UA). Conclusion NAFLD might be a risk factor for DN. Elevated liver fat content could be associated with higher DN burden.
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