"Eat clean, train mean," may be a mantra you've pinned multiple times, but outside of Pinterest, the lure of a cheesy, carb-loaded pizza after a long day of work may be nearly impossible to resist -- especially if you have to pass a pizza joint on your way home. The reason? Researchers at Cornell University found that women ate more chocolate when it was nearby and in sight. The good news? Researchers say this same principle applies to good food as well as bad. Keep healthful images close (as in, right on your smartphone) to inspire better habits. Here, the best Instagram accounts you need to follow for serious healthy-eating inspiration (it's food porn you won't feel guilty about recreating).