I've gone almost the opposite direction... I seem to have a negative reaction to so many foods. When I gave up all heavy carbs, I've done much better and lost about 60# (I'm still fat and diabetic, but still working on it). But just about any foods with any significant carbohydrate I seem to respond negatively to. When sticking to mostly meet and greens, I feel significantly better.

It's worth noting that I seem to be allergic to legumes (and cranberries). So that precludes complete protein from non-animal sources. My biggest issue is actually eating the more fatty meats. I've also never cared for organ meat of any kind. I'm getting more used to it now, but it isn't always easy to swallow so to speak.