Drinking isolated whey protein diarrhea may be caused by the user’s allergy to this whey protein, in addition, the water used for brewing is too cold or unclean, can also lead to symptoms of diarrhea in the drinker. Drinking isolated whey protein diarrhea may be due to the user’s allergy to the whey protein, in which case the patient may also experience abdominal pain, nausea, vomiting, mucous blood stools and other symptoms, such cases need to avoid eating whey protein. It should also be noted that the water used to brew the whey protein isolate should not be too cold or unclean, if the brewing water is too cold may lead to gastrointestinal sensitivity, which may lead to diarrhea, and the brewing of the use of unclean water, will lead to intestinal bacterial infections, which may lead to diarrhea. If you have diarrhea after drinking whey protein isolate, it is recommended that you seek medical attention in a timely manner and ask your doctor to take care of it.