Here is a very good video on understanding nutrition and it's function in bodybuilding. There is also a part 2 and 3. Well worth the watch.
Exclusive Species Nutrition with Dave Palumbo - P…: Exclusive Species Nutrition with Dave Palumbo - Part 1 of 3 - YouTube
Exclusive Species Nutrition with Dave Palumbo - P…: Exclusive Species Nutrition with Dave Palumbo - Part 1 of 3 - YouTube