A frozen margarita yields between 450 and 750 calories, compared to between 100 and 200 calories in a glass of sangria, says Anne VanBeber, R.D., chair of the Department of Nutrition Science at Texas Christian University in Fort Worth, Texas. That’s a meal’s worth of calories in one frosted glass. Plus, eat the fruit in your sangria and you get fiber and vitamins. If you have to have your margarita, ask if there's a "skinny version" on the menu. And pass on the salt -- your dinner will deliver more than enough sodium.