Will Brink's "Muscle Building Nutrition" is in my opinion the the most complete, comprehensive and easy to understand information published to date on "how to eat to achieve lean muscle gains". (It has even been described by bodybuilding legend Lee Labrada as a "must read").The author, Will Brink, is a genuine sports nutrition and supplementation expert, with all the credentials to prove it - not just another of the many "self acclaimed experts" that seem to appear everywhere on the Internet these days. (This fact in itself makes Muscle Building Nutrition worthy of further investigation!)
The fact is that anyone who's been working out for any length of time knows that your efforts in the gym will largely go unrewarded if you don't eat correctly. In fact many experts say that if you're trying to build lean muscle as much as 80% of your end results are down to correct nutrition and rest.