Half your weight may sound like a sky-high amount of water to sip, but this magic number could be the key to unlocking your body's fat-burning potential.

Dietician Julie Upton, MS, RD, of Appetite For Health [1] recommends "drinking about half of your body weight in fluid ounces of water (or other calorie-free beverages). Cold water provides a brief shock to your metabolism, raising it by about 30 percent so that over the course of a day, your body will burn about 100 more calories." It may sound like a ton of liquid, but it's an absolutely doable amount; for example, if you weigh 150 pounds, Julie is recommending that you aim for 75 fluid ounces (or just under nine and a half cups of water) a day.

If you're a soda or juice drinker who is having a tough time making the transition to good old H2O, try these healthy water additions [2] like lemon and mint that can amp up the flavor of your cup and double its detox power.