Snap your snack: Taking a photo of your plateful of food can keep you slim. People who took pictures of everything they ate for five days reported consuming fewer snacks and being less likely to go back for seconds than during a week-long period in which they kept a written food diary, a study from the University of Wisconsin at Madison finds. Try capturing your meals for a week to help eyeball portion sizes as well as color variety—aim for more green, less white (unless it's cauliflower).