I'd like to start a friendly debate. On a practical, real-world level, you cannot eat to grow bigger muscles. You can eat to grow BIGGER but for the purpose of looking good (as in bodybuilding), eating to get more muscular doesn't make sense. From the EATING FOR SIZE article: "CALORIES At the simplest level, an excess of calories is required for the body to increase its fat-free/water-free mass." If excess calories are needed to build muscle, why does it also build fat? How many extra calories are needed to build just muscle? If eating extra calories did in fact build muscle, why would you stop? If food is anabolic to muscle tissue, then you have to assume the lack of food is catabolic to muscle tissue. So if you took a bodybuilder who ate his way up to a higher bodyweight in the offseason, then you would assume that they would lose what they gained when they dieted down. Just so many holes to the theory.