If you want to lose weight, you should drink diet soda, right? Well, not necessarily...too much may have the opposite effect. Research shows that people who have diet drinks regularly may be more likely to gain weight and develop metabolic syndrome, a condition that includes having excess belly fat, high cholesterol, high blood pressure and insulin resistance. One theory why: Taste signals how many calories are in a particular food and helps your body judge how they should be used. Loading up on sweet drinks with no calories interferes with that signal, making it difficult for your body to determine how much you really need to eat.
AVOID IT... Water is always an ideal choice, but you don't have to go cold turkey on the diet soda. Limit yourself to one a day, and be careful not to compensate with high-calorie beverages like fruit juice or sport drinks.