Learning the right way to diet for muscle building can be tricky but with careful understanding on what to eat makes it easier than what you think. Dieting goes well with exercise for the reason you need energy to perform any task in muscle building. Protein is the best answer to gain more on muscles without it, its pathetic to workout and youd stay skinny for life. Daily intake of 30% of protein is the usual recommended diet. Not only that protein builds muscles but it serves as energy fuel to have a jumpstart in your mass building workout in a form of amino acids.