i would strongly suggest your fiance to go see his doctor immediately. especially if he still has his gallbladder as an intolerance to greasy foods is a good indicator of gallbladder problems. it could also be a problem with the way his body is absorbing food. however if he no longer has his gallbladder and this is the only symptom he is showing he could always try eating more fiber as well as taking pepto-bismol before the meal. that would help but i would advise he consult his doctor as this could be a sign of a bigger problem.
is there a medicine or something you can do or take before eating certain foods to prevent diarrhea? . my fiance loves to eat spicy foods mexican and pizza but gets diarrhea every time. he was experiencing diarrhea on a daily basis for months before cutting back on those foods but even with eating them less he still gets it when he eats those foods. i didn't know if there were meds or a supplement he could take before eating so that he would not have diarrhea after. this happens with pizza spaghetti sauce hot sauce mexican and anything with very much grease. any cures would be helpful!