The study shows that if you increase drinking sugary beverages by one serving per day, it will lead you to gain an additional pound of body weight over four years.
So if your goal is to lose weight or stay healthy, your best bet is probably to have a small serving of regular ice cream, a serving -- no seconds -- of a low-fat and low-sugar ice cream, or better yet, a bowl of fresh fruit -- with a tablespoon or two of ice cream on top if you really love it!