The Zone diet touts eating foods in a tight balance (often referred to as "blocks"). A block has 40% carbohydrate, 30% protein, and 30% fat. The idea is that this ratio is both health and satisfying for people.

Overall blocks per day are set as well. Thus, the amount of food you eat is limited. This is a low calorie diet.

The diet is broken down into 3 phases: Entering, eating, and living in The Zone.

From the back-cover of "Enter the Zone":

1. Eat for a better quality of life
   
2. Americans are getting fatter in spite of eating less fat.
   
3. Eating fat doesn't make you fat.
   
4. Athletes perform better on a high-fat diet.
   
5. You can burn more fat watching TV than by exercising.
   
6. A high-carbohydrate diet for cardiovascular patiences may be dangerous to their health.
   
7. The quality of your life is controlled by the foods you eat.
   
8. Food may be the most powerful drug you will ever come in contact with.
   
9. The new dietary recommendations of the US government nutrition experts and medical experts are dead wrong.
   

The Zone tells you why

1. Achieve permanent fat loss and better physical performance while reducing the likelihood of disease.
   

The Zone tells you how