Protein will not make you fat!
Myth: Excess protein just turns to fat
We find this myth the most amusing. Even if you knew nothing about nutrition, you’d probably assume it was quite difficult to turn a piece of muscle tissue into the fat that sometimes surrounds it. Just look at a piece of marbled steak. Intuitively, you’d probably think it would be some kind of magic to turn the red tissue into the white tissue.
You’d be right. It isn’t necessarily magic, but it is a very long and metabolically costly process to turn protein into fat. Protein needs to be broken down into amino acids and absorbed. That process alone burns about five times as many calories as the process of breaking down carbohydrates to glucose. Once the amino acids are available, they can be used for growth and repair or converted to glucose. If they are to be converted, that requires some energy again. The body will turn protein to glucose when necessary, but it prefers not to. If the glucose isn’t needed, it can then be converted to fat.
You can’t turn protein directly into fat. At some wildly excessive point, you might be able to eat so much protein that it could become useless and get stored as fat. However, protein has such a potent effect on reducing appetite, you wouldn’t be able to eat that excessive level on a daily basis. You’d also expend a lot of energy as heat with the excessive protein intake.