Lemon water may be a dieter’s best friend. “The polyphenols in lemon may aid in reducing appetite,” registered dietician Erin Palinski-Wade, RD, CDE, author of Belly Fat Diet For Dummies. Rodent studies have shown that the polyphenols in lemon do help to prevent weight gain. Plus, she adds, “when you drink a glass of water, especially before a meal, this helps to fill your stomach, offsetting the amount of food needed to feel satisfied.” Lemon-flavored water is also a healthy option to replace your morning glass of orange juice—think of all the calories saved! To make lemon water, use whole lemons (not lemon juice in a bottle). “Try squeezing the juice from one lemon into 8 to 12 ounces of water,” Palinski-Wade says. You can also grate in a bit of the zest (just wash the lemon first). “Enjoy it cold or warm, but if you will be having it to promote weight loss, drink it chilled with ice,” she says.