The glycemic index
From “The South Beach Diet” to “The Zone,” many trendy diets are based on the concept that not all carbohydrates are the same — some are better than others for weight loss and good health. While common sense tells us it’s good to eat whole grains and fresh fruits and vegetables, a tool called the glycemic index (GI) makes it even easier to choose wholesome foods that may aid weight loss and help prevent disease.