What It Is: The Zone Diet, developed by Dr. Barry Sears, purports to balance the body's hormone levels within a specific range by controlling the foods that are consumed. According to the official website for the diet, "The Zone Diet can best be described as a moderate-carbohydrate, moderate-protein, moderate fat diet that has approximately one gram of fat for every two grams of protein and three grams of carbohydrates."
The Zone Diet places special emphasis on the moderate intake of low-fat protein, low glycemic-load carbs (such as those found in fruits and vegetables), and monounsaturated fats, as well as all needed nutrients.
Expert Verdict:
Ayoob: "This one is fairly moderate, focusing on a good amount of lean protein, moderate fat and moderate carbs. Skip the vegetarian version if it's not your thing."
Katz: "I think this is too high in protein. It works by providing a strict dietary discipline, but suffers the same problem with sustainability as the others."
Ikeda: "Another oldie that had no impact whatsoever on the obesity epidemic in this country."