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1. Diet soda
Diet soft drinks may not have the sugar or calories of regular soda but don't fool yourself into thinking that it's the healthier, lighter choice. "Diet sodas are full of artificial sweeteners and ingredients," says Erin Palinski (RD, CDE, CPT), author of Belly Fat Diet For Dummies. Besides, they may not be as good for your waistline as they claim to be: According to a University of Texas study, people who drink diet soda actually has a 41% increase in risk of being overweight for every can or bottle consumed each day.