If I read the article right, it's not that you get fat from the aspartame (which the body can't extract any energy from), but that aspartame blocks IAP, which i

If I read the article right, it's not that you get fat from the aspartame (which the body can't extract any energy from), but that aspartame blocks IAP, which is thought to work against the detrimental health effects of a high-fat diet. They also noted that blood-sugar levels for the aspartame-consuming mice where higher for both types of diets.