As with any exercise program, nutrition is a necessary companion. The official P90X nutrition guide is the probably the best diet book ever. There is a ton of information packed into the small book, which makes it very easy to read. The creators of the nutrition guide understand that some people don’t have the time to make several meals for each day. They have given you options on how to achieve the results desired. If you need someone to tell you what to eat for each meal, then turn the nutrition guide to that page and it details every single meal. If you just want general guidance on what to eat, well, thats in there too. I have read the guide several times and I learn something new each time.