From what I understand, it has something to do with the fact that the human body did not evolve with any way to send the signal that it craves more cannabis, so it uses the hunger signal instead. When you get the munchies, your body is apparently just craving more THC, but it doesn’t know how to tell you.
Cannabis molecules (cannabinoids) interact with all sorts of systems in the body. One of these systems is the food-seeking system. We think that it increases the levels of hormones that make you feel hungry.
More indepth:
https://www.nature.com/articles/s41398-020-0756-3
An important thing to note is that the endocannabinoid system is a regulatory system, which has its hand in regulating a whole heap of different bodily functions like digestion, fertility, immune function, mood, the list goes on. This is why cannabis has such profound effects across the brain and body. It directly interacts with the endocannabinoid system, which then affects other systems through regulatory processes.
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