Okay, here is what you diet needs to be like to build muscle. Every day you need to eat 1.5 - 2 grams of protein per lbs. bodyweight. This sounds like a lot, but is easy to do.
The Professional Muscle Building Diet - Part 1


Okay, here is what you diet needs to be like to build muscle. Every day you need to eat 1.5 - 2 grams of protein per lbs. bodyweight. This sounds like a lot, but is easy to do. Next, make sure you are eating enough calories. You should eat as many calories as possible while not gaining fat. You need a lot of complex carbohydrates(not only do they account for most of your calories, but these are what "fill you up" and give you the much needed energy.)

For example: During my "offseason" (term refering to the time not dieting for a competition,) I was eating 3,000 to 4,000 calories a day. Your daily caloric intake should be as much as possible but without getting fat, as I already mentioned. Just be sure to spread them out evenly. Make sure that you are not eating too much sugar or that will lead to gaining fat as well. 5 - 6 meals daily will suffice with 2 - 3 hours between each "feeding".If you notice that you are gaining fat, reduce daily caloric intake by 300 calories for a week and keep doing so until you stop gaining fat. For this reason, it is imperative to measure your bodyfat once a week to make sure that the weight that you are gaining is not fat. You can get a skinfold caliper that measures bodyfat just about anywhere and for cheap.

You need to purchase a food scale. You will also need to record when you eat, what you eat, and how much of it you eat. Microsoft Excel is an excellent program to use, as it can be saved, and will add up all of your total calories, protein, fats, and carbohydrates. You also want to make sure that you are not allergic to any foods that you have never tried. For example: if you have never tried green beans, don't eat a lot at first. Be Smart.


Supplements


Supplementation plays a HUGE role in getting enough nutrients. Supplements come in many shapes, forms, and sizes. I feel that the most important supplements include the following: Protein Shakes (Both Low-Carb and High-Carb), Protein Bars (Both Low-Carb and High-Carb), Amino Acid Supplements, Vitamins, and Creatine Monohydrate.