If you are constantly looking at junk food, you will constantly eat junk food. That's because "you are three times more likely to eat the first thing you see than the fifth thing you see," says by Brian Wansink, PhD, director of the Cornell University Food and Brand Lab. To take advantage of this out-of-sight, out-of-mind effect, banish bad foods to upper cabinets and remote pantries. Instead, shelve healthy foods like fruits, vegetables, and nuts at eye level on the counter or in the refrigerator. Leaving sugary or salty snacks out will only encourage you to eat when you notice them.