Athletes and weight lifting enthusiasts commonly have the misperception that eating as much protein as possible will give them the biggest muscles and the best performance. This is entirely incorrect.
Protein is necessary for normal function in many ways, and it certainly is critical to building muscle mass. The reality is that each person has a limited amount of protein that can be absorbed into the muscles during a given day. Genetics are a major determinant of this. For all of us, consuming protein above and beyond that limit can result in unwanted fat gain. Proteins are large molecules that take hours to digest. As such, they’re not ideal sources of energy, per se. Often, by the time they’re digested, we are no longer active and their calories have to be put into fat stores if they are otherwise unusable.