I’m not talking about while you’re eating, I’m talking about during the next couple hours after over eating. A food coma is absolutely the same feeling as a good high from some drugs. After eating a way too huge meal and laying on the couch i feel soooooo relaxed and floaty and drifting in and out of heavy sleep.
Yes there’s also a mechanism in our brains that if a food is high enough in nutrients like calories, fat, etc. we don’t feel full and just keep eating. In the past such sources were few and far between, so when one came upon them, we needed to eat as much as physically possible. The issue is, these days we have a lot of food like that. Our brains can’t handle it, so we overeat very easily.