It's interesting that you guys mention the IBS and cherry/flavors bothering you. I was like that too. My stomach always bothered me and cherries/blueberries really did a number on my stomach. Turns out I had chronic renal failure and my body didn't like those things because they are loaded with potassium and phosphorous. Your kidneys process that out but if they are failing, they can't do that. Make sure you ask your Dr.s if there's any chance you can have your kidney function determined.