Soy Protein

I find that whenever I eat soy I get an upset stomach and have diahrea quite badly. Is soy intolerance a common problem and what causes it?

I dont know about soy but I tried the whey protien and it went right through me as well.  

Soy is a common allergen - that could be the problem.  Diarrhea and other GI upsets have many possible causes.  It could have been a recent round of antibiotics changing your intestinal bacteria a little that makes some foods less tolerable, or a medication, or a combination of foods. Depending on how far out your surgery was, you may just be malabsorbing. Try a different protein source - like whey. Try using your protein in a different way - maybe mixed into applesauce where you will eat it slowly. Too hot or too cold can give some people problems. Try to look at the bigger picture - see if there is another possibility for your tummy trouble as well. Good luck!