 [ Symptoms ] whey protein has caused unstoppable diarrhea body is getting weaker by the day [ Disease ] whey protein and dairy products over intake may cause stool loosening and diahrrea you may be having a temporary overdose effect or your body has developed lactose intolerance or allergy it takes time to remodel and you need to avoid it at all until you are back to normal eat normal proteins like poultry and meat taking coffee may help for a while and drinking plenty of water is a must to avoid dehydration from diahrrea