OBJECTIVE:To test the effect of low calorie diet (LCD) on body weight, lipid profile, and glycemic control in obese type 2 diabetes mellitus (DM) patients. DESIGN: Dietary intervention. SETTING: Department of Human Nutrition, Copenhagen. SUBJECTS: Outpatients: 11 type 2 DM patients (three males/eight females) (10 completed), four on oral hypoglycemic agents (OHA). Body mass index (BMI) 36.875.5 kg/m 2 and age 6275.7 y. INTERVENTIONS: In all, 8 weeks full meal-replacement diet: eight sachets of a nutrition powder (Nutrilett s , 850 kcal/day). Lipid profile assessed by NMR spectroscopy. RESULTS: Mean body weight fell by 10.9 kg (B11%, Po0.001). Fasting insulin, fasting blood glucose, hemoglobin A 1c , fasting plasma triglycerides, total cholesterol, and low-density lipoprotein (LDL) cholesterol fell significantly. There were large positive changes (statistically insignificant) in LDL subclass distribution and a similar shift in high-density lipoprotein subclass distribution. Medication was discontinued in all four subjects taking OHA for 2 weeks prior to the intervention and throughout the whole 8-week intervention period. CONCLUSION: LCD is effective in improving glycemic control and blood lipids through weight loss in overweight type 2 DM patients.