Sugar Alcohols?
As long as I stay under about 5-6 grams of Sugar Alcohol I seem to be just fine. If I go above that I get the laxitive effect and on top of it too many calories. Never heard that it makes you tired. Actually, the whole point of sugar alcohol is that it has a no impact on blood sugar so it shouldn't do anything. Sugar on the other hand can make you first wired and then more tired later.