Swap out the squeeze of lemon for a handful of ice: Cold drinks prompt your body to expend more energy to maintain its preferred 98.6-degree temperature. This means downing three 24-ounce servings of ice water in a day can help your body burn up to 100 extra calories, says Mitzi Dulan, R.D., nutritionist for the Kansas City Royals and author of The Pinterest Diet. Do it every day and you could lose up to 10 pounds over the course of a year. (Make that water more interesting with these 25 sassy water recipes.)