The hardest part about staying healthy is not munching on random cravings in the afternoons/ evenings. But what is it that causes these cravings? Well an article by K. Aleisha Fetters on CNN.com claims that munchies are caused by a lack of sleep. Luckily the article also talks about ways to avoid this bad habit. For example if you are in the mood for fatty foods, eat something with avocado so you are getting healthy fats. In addition if you are craving something sweet, Greek yogurt is always a great option.