A ketogenic diet can be great for people who are overweight, diabetic or looking to improve their metabolic health. For more details on the weight loss effects of a ketogenic diet, read this article. One study found that people on a ketogenic diet lost 2.2 times more weight than those on a calorie-restricted low-fat diet. Triglyceride and HDL cholesterol levels also improved . However, only the standard and high-protein ketogenic diets have been studied extensively.