…as long as you drink in moderation. That’s according to Harvard University researchers. They found that study participants were only likely to gain weight if they consumed more than 3 drinks a day. And those who drank liquor were more likely to gain weight than those who preferred wine. Even though a serving of wine has about the same number of calories as a serving of liquor. The reason? Because most people drink hard liquor with mixers and flavored syrups – which are packed with sugar and calories. And that can turn a 100-calorie shot into a 500-plus calorie margarita or mai-tai.