I have always been able to eat everything I wanted to but lately sometimes when i eat ice cream i will get diarrhea not every time though and usually i can drink milk and be fine. Also, greasy foods will do the same for me too, or they make me have nausea. I gave up alot of sweets for Lent for my religion and i usually do not tend to eat tons of greasy foods. I exercise daily and am a college student. Should i be concerned about this? or is my body just not used to eating super fatty foods anymore?