You don't eat less, you eat better.
There is a guide in the nutrition book that has you measure your weight and check it against a chart that shows you which diet to go with.
Most of the food is a lot of lean meat and veggies. Very little fat and carbs, nothing is cut out completely, but most of what you will eat is meat and veggies. You'll drink a lot of water too. (I cut out drinking adult beverages for the three months too) I found that if I just commited to the entire plan, every workout and the eating plan I was able to stick with the whole program. Not being a veggies guy is no excuse, you'll need to find something you can get by with. I am also not exactly a veggies guy, but I found some stuff I could eat. I can't remember the exact portions, but I found I had to eat all day long to make sure I ate everything I was suppose to. I bought a little scale to help count out the portions too, it really helps you get an idea of exactly how much you are taking in. Most people have no idea what the size of the portions they are actually comsuming are.