Glycemic-index diets

The glycemic index ranks carbohydrate-containing foods based on their effects on blood sugar. Similar to the theory behind low-carb diets, most low-glycemic-index diets claim that lowering blood sugar levels leads to weight loss.

You may have difficulty following a diet that emphasizes only foods with a low-glycemic-index ranking. Many factors other than food influence your blood sugar level, including your age and weight, the type of food preparation, and the portion size. The South Beach diet is an example of a low-glycemic-index diet.