system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why smoking marijuana makes you hungry.

I've heard a couple different reasons, but I don't know exactly why. Is it completely psychological? Or are your receptors in your brain for hunger being inhibited? Or is your metabolism actually sped up? Or is it none of those?
gpt
It is definitely not psychological, it is biological. Basically the THC binds to endocannabanoid receptors in your body, mainly CB1, which triggers all the effects of marijuana in your body. It simply stimulates hunger, it does not speed up your metabolism (if it did it would be the hottest diet craze). The receptors that control hunger in your body are not inhibited, but rather activated.