Mastering The Zone claims most people suffer from insulin imbalances that cause them to gain weight. According Barry Sears, consumption of protein, carbohydrate and fat in exact proportions, the imbalance is corrected and excess weight drops off. Living in the Zone also can prevent heart disease, diabetes, PMS, depression and cancer, according to Sears, who also claims that this plan can slow the aging process. Average caloric intake ranges from 1,000 to 1,700 calories per day.

Advantages:
The plan recommends lean protein sources, minimizing consumption of saturated fat. The typical American diet is not far from the 40/30/30 ratio of carbohydrate/protein/and fat.

Disadvantages:
Carbohydrates such as grains, fruit juices, pasta, starchy vegetables and bread are not prohibited but serving sizes are minute (1/4 c. cooked pasta, 1/8 c. baked beans, one-square-inch of corn bread). Choices, combinations and portions can be odd and unappetizing. For example, a snack choice includes two hard-boiled egg whites, half an apple and three almonds.

Long-term Success:
Because the plan is based on very low calories and strict combinations of protein, carbohydrate and fat at every meal, long-term success would be very challenging.

Created by Barry Sears, Ph.D.