Background: Diabetes mellitus is a metabolic disorder characterized by chronic hyperglycemia and body composition is important in the disease control. The nutritional intervention has relevance in the improvement of glycemia and lipemia in diabetic patients. Aim: Evaluate the influence of fat intake on body composition, lipemia and glycemia on patients with type 1 diabetes mellitus. Methods: 19 patients were evaluated by anthropometric (body mass index and waist circumference), body composition (fat mass, lean body mass and total body water by bioelectrical impedance) and biochemical variables, after 8 hours of fasting. Dietary assessment was performed using the dietary records for 3 days, analyzed for nutritional software DietPró 5i. The groups were formed according to the usual intake of saturated fatty acids (SFA) (G1