National Ice Cream Day is Sunday. If you want to celebrate without so much guilt, keep those portions under control. A kiddie cup is actually an appropriate portion of ice cream. Doctors with the Cleveland Clinic say if you choose a cone instead of a cup, go with a cake cone. It has about 15 calories, much less than sugar and waffle cones. Doctors also say go easy on the toppings. You could end up doubling the fat and calories if you're not careful.