Diarrhea is because protein can't be fully digested and absorbed, which increases the burden on the intestine, leads to intestinal dysfunction and accelerated peristalsis, shortens the time for feces to stay in the intestine, and excretes water in feces without being absorbed by the intestine, so the stool is sparse. If this happens for a long time, it is recommended to stop using protein powder. The average person can get enough protein from normal food. If the intake of protein exceeds the intake of protein, excessive protein will become a burden to the body and be harmful to the body. Extremes must be reversed.