Celebrity Fitness

"Lemon—besides offering a fresh and tangy flavor—has been shown to help with weight loss," says celebrity nutritionist Keri Glassman. "Add an ounce of lemon juice to each of your eight daily glasses of water for a quick antioxidant boost!" If you're on the go, add a True Lemon packet ($5 for 32; at truelemonstore.com) to your water for the same effect.