Sugarfree ice cream is most always sweetened with Aspartame which can casue a whole lot of new problems. It is not a safe sweetener even tho it's been approved to use in most sugarfree products. For instance, a few side effects are memory loss, headaches, blurred vision, heart palpatations, dizziness, etc. I've read several horror stories from long-term ingestion of Aspartame (also known as Equal).
If you can't do without ice cream, eat the real thing, just watch your serving size. Also, check the ingredients and get the name brand that has only wholesome ingredients, albeit fat and sugar, which are the main ingredients in all brands. Stay away from as much preservatives and additives as you can, and enjoy.