What are you eating? Low carb highlighted issues I have with gluten and a few other things. I've done some trial and error tests and found that gluten, nuts and certain raw veggies upset my gut a lot. I'd cook all veggies until your gut settles down.

If you're eating low carb products, check them for gluten. It is also in soy sauce, beer, anything containing malt (in the US). You can usually buy gluten free soy, beer and so on.