Protein farts are smelly farts that often occur in fitness enthusiasts and may be related to irrational diet, excessive protein intake, and intestinal flora imbalance. 1. Excessive protein intake: Especially fitness enthusiasts, who often consume all kinds of protein powder, will have excessive protein intake. Protein powder contains a large amount of lactose, if consumed in excess, lactose fermentation in the intestinal tract to produce gas, which will cause protein farts. 2. Imbalance of intestinal flora: If the intestinal tract is not functioning well, the intestinal flora will be out of balance, and there may be a large number of gas-producing bacteria multiplying, coupled with the intake of a large number of proteins, which are difficult to digest, and protein farts will occur. There may be other reasons for protein farts, so it is recommended that you go to the hospital in time, complete the examination to determine the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.