Dr. Atkins does say that products sweetened with Splenda (Sucralose) are okay for induction, but he also cautions to count 1 packet of sweetener as 1 gram of carb and to limit them to 3 a day on induction. I'm not sure how many packets of sweetener the average sugar free jello cup would have, but the I believe that the Jolly Rancher Jello cups list the total carbs at about 3 per cup so that may be your whole day's artificial sweetener allowance right in one place. In Dr. Atkin's updated version of his book, he also says that he discourages his patients from using anything with Aspartame in it because of health concerns and concerns over safety of the product.