Sunnybear, its very logical if you think about it. You count every carb that your body can process and will effect your insulin levels (blood sugar levels). Fiber is not processed by the body. It is consumed and promply eliminated. You can subract it from the carb count because it isn't absorbed by the body and therefore has no impact on your weight or your blood sugar. Supposedly sugar alcohols are like that too BUT as Yvonne mentions, many people do find that sugar alcohols effect their weight loss. If you are eating your icecream and you are still losing, then you are one of the lucky people who are not effected by the sugar alcohols so go ahead and eat your icecream and subtract the sugar alcohols as well as the fiber to get your net carb count. If you ever find yourself stalled in weight loss, try cutting out the sugar alcohols and see if it helps. I hope this helps.