I always do diets to keep being thin, and i exercise a lot. but lately, when i eat any kind of sugar i get a stomachache and diarrhea, why?

Diet: Hi, usually a lot of people have trouble digesting and breaking down the sugar alcohol which are sorbitol, mannitol, xylitol, isomalt, and hydrogenated starch hydrolysates. Sugar alcohols come from plant products such as fruits and berries. The carbohydrate in these plant products is altered through a chemical process and because they cannot be absorbed well they cause diarrhea and bloating.