How do you keep from losing weight. Everything I eat even low FODMAP seems to cause colon pain. I'm nearly 80 years old & have had this for more years than I can remember. To make it worse I can't drink (because of allergies & kidney disease) the things like Ensure that helps keep weight on & gives us our vitamins & Min. Even though I am still eating some I lose weight daily. The only advise my GP has is "don't lose anymore weight". It's difficult to eat when you're not hungry & know it will make you feel worse. Anyone have suggestions for gaining weight? Never thought I would have this problem. Thanks.