The reason this happened, theorize the researchers, is that the pictures act as a subtle visual reminder of the dieters’ weight-loss goals. To get a similar effect, researchers suggest sticking pictures of low-cal, good-for-you foods on your fridge or on your cupboards. That way, you’ll see them before you choose what to eat and may end up consuming fewer calories without even thinking about it. Another option: Make the background on your phone a picture of a low-cal food. Since you probably look at your phone every, oh, two seconds, chances are you’ll see it before you reach for any candy or cookies—so you'll be subtly reminded to eat less.