The first few days you'll feel like you're force-feeding yourself, and then it will all change and you'll feel incredible. Get at least 20 grams of protein per meal, no matter what.
Related problem: not eating enough food. Do not try to restrict portions or calories. Eat until you are full, and eat as much as you like of the approved foods. If you don't, you will either downshift your metabolism or cheat between meals with banned-food snacks.
Find out more about this book:The 4-Hour Body: An Uncommon Guide to Rapid Fat-Loss, Incredible Sex, and Becoming Superhuman