This is mostly a vegetarian diet. Fats are kept to a 10% of overall intake. You are encouraged to eat 6-7 meals per day. Processed grains are also excluded. You are required to walk 45 minutes per day.

From the back-cover of "The Pritikin Weight Loss Breakthrough":

By understanding our genetic "fat instinct," he explains, we can outsmart it -- balance our diets and slimming our bodies successfully. The exciting new discovery makes weight loss easier than ever, with a more workable approach for today's lifestyle and new food choices for a diet experience that's about satisfaction, not deprivation. This book includes:

1. A proven plan to shed pounds--without hunger and withou drugs
   
2. The real story on carbohydrates
   
3. Tips on outsmarting the fat instinct by altering behaviors
   
4. Helpful advice on resisting unhealthy foods
   
5. 60 delicious new recipes and more