good diabetic clinics in bangalore Diabetes, especially when uncontrolled, can lead to weight loss, particularly in people with type 1 diabetes. However, it can also contribute to weight gain if not managed properly. Unmanaged diabetes causes the body to burn fat and muscle for energy due to high blood sugar levels and insufficient insulin. This leads to unintended weight loss and dehydration due to frequent urination. Weight loss in diabetes can also be a symptom of an eating disorder.