Lean protein, oat bran, water, and a daily 20-minute walk are at the heart of the plan. The theory is that limiting carbohydrates forces your body to burn fat.
Basically, you can eat unlimited quantities of food, as long as they’re on the approved foods list, which includes very few carbs, if any.
The diet has four phases.
During the “Attack” phase (1-10 days), you eat all the lean protein you can handle, plus 1.5 tablespoons of oat bran and at least 6 cups of water daily.
In the “Cruise” phase (which can last several months), you add unlimited amounts of non-starchy veggies every other day, plus an extra half-tablespoon of oat bran.
When you get to the third stage, “Consolidation” (5 days for every pound you've lost), you can have veggies every day, plus one piece of fruit, 2 slices of whole-grain bread, and 1 serving of hard cheese. During this phase, you can also have 1 or 2 servings of starchy foods and 1 or 2 “celebration” meals where you can eat whatever you want.
The final phase, “Stabilization” (ongoing), is all about maintenance. You can eat whatever you like, except for one day a week when you follow the all-protein rules from the diet’s “Attack” phase. In this phase, you also eat 3 tablespoons of oat bran a day and walk 20 minutes every day.
Sugar-free gum, artificial sweeteners, spices, and unsweetened coffee and tea are allowed. As for alcohol, you can have a glass of wine per day during the consolidation and stabilization phases.