Scientists have found that marijuana-like substances naturally produced in the brain, called endocannabinoids, stimulate appetite. The study showed that these endocannabinoids are part of the brain's complex system for controlling when and how much to eat. Scientists have known for several years about the existence of these substances, which are chemically similar to the active ingredient in marijuana but do not make people high. Thanks to Zach for the help. Thought everyone would like the technical facts about the munchies! I love you guys!