I am pre-op and have been changing my diet, eating better, cut out all soda and almost all caffeine. I have been feeling good. Today I ate a protein bar for the first time and it has made me feel terrible. Has anyone else had this problem? I feel nauseous and just bad. The fact that I have 3 more protein bars in my pantry makes me want to throw up. Anyone else can't tolerate the protein bars? The drinks don't seem to bother me.

First-good luck with the pre-op. Second, maybe it's the brand of protein bars. I love them. I eat the Cliff ones that have 20g of protein. They make different ones. My dietitian told me to eat these. I have had the chocolate chip, chocolate mint and chocolate with peanut butter. Love them all. If you hate the ones you have, return them. Almost every store takes them back.

Check and see if it has sugar alcohol in it. That can act like a laxative. Also some bars have too much fiber. I gave up trying yo find a bar and decided eatting food works much better for me.