IANA nutritionist or expert at all in this area so take this with a grain of salt, but my understanding from looking into it is that the sugar alcohol doesn't break down in digestion and isn't absorbed, that's why the "carbs" from sugar alcohol "don't count."

I would recommend taking it easy on the sugar alcohols even though they "don't count" because they can cause significant gas ;-)

I also hate the games they play with labeling such as "no sugar added." Bought a cherry pie from a local market labeled "no sugar added" thinking it was going to be extra tart only to take it home and taste sugar. Reading the label it listed sugar alcohol which I learned can cause gas and bloating in some people, which I soon found out. Once slice had me doubled over with gas pains a whole night and shit my brains out the next day. I got my money back for that piece of garbage pie. I want to punch whoever thought no sugar added means fuck all...

Sugar alcohols seem simple enough to me. The properties vary but they generally have fewer calories per gram and a low glycemic index, and some of them are much sweeter per calorie.