3. THE ZONE DIET
CELEB FOLLOWERS: Jennifer Aniston, Demi Moore, Sandra Bullock.
HOW IT WORKS:
Developed by former scientist Dr. Barry Sears, The Zone Diet involves getting 40 percent of your daily total caloric intake from carbohydrates, 30 percent from carbs and 30 percent from fats. According to Sears, balancing the correct amount of amino acids with carbs helps control the appetite to prevent over-eating. Followers eat three portion-controlled meals and two snacks a day, preventing you from getting too hungry or moody.