The research revealed that CB1 receptors flick a switch in the brain that induces this group of neurons to secrete a substance that makes the marijuana user hungry. “Using cannabis also stimulates the production of ghrelin — the ‘hunger hormone’, which increases your appetite,” Professor Copeland said.
https://www.abc.net.au/news/health/2016-09-20/why-does-marijuana-give-you-the-munchies/7861526
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