Fats are reduced to 10% of your calories. High fiber foods are recommended. Moderate amounts of alcohol, sugar and salt are allowed as well. You can eat all the food you want otherwise. Exercise is also recommended.

The the back cover of "Eat More, Weight Less":

You really can eat more and weight less -- if you know what to eat. As this groundbreaking book clearly shows, it's not just how much you eat, it's primarily what you eat.
Most diets rely on small portion sizes to reduce calories sufficiently. You feel hungry and deprived. Dr. Ornish's program takes a new approach: abundance rather than deprivation. If you change the type of food, you don't have to be as concerned about the amount of food. You can eat whenever you're hungry, eat more food -- and still lose weight and keep it off. Simply. Safely. Easily. In this book, you'll find 250 gourmet recipes from the country's most celebrated chefs.
Unlike high-protein diets that may mortgage your well-being, Dr. Ornish's diet and lifestyle program is scientifically proven to help you lose weight and gain health. People not only keep off the weight, they lower their cholesterol and reduce their chances for getting heart disease and such other illnesses as breast, prostate, and colon cancer; diabetes; osteoporosis; and hypertension. Dr. Ornish's program has given millions of people new hope and new choices.