Chocolate. Potato chips. Ice cream. You know the triggers - and the power they have over you. Rest assured, you're not alone. Food cravings can have little to do with hunger, though, and lots to do with mental and physiological components. Let's take a look at the main causes of these cravings - and some tips for overcoming them. n Leptin ResistanceLeptin is a hormone your body produces in fat tissue.