Thinking takes a lot of calories

Not sure where I heard it but intense thinking burns loads of calories. Peak consumption is something like 500 calories an hour or something. Of course people don't think at that rate all the time.

Perhaps that's why cannabis gives people the munchies? There is a system somewhere in the brain or as some part of the brain's psychology which realises the cannabis high means resources are low so more food is needed.

At any rate, a good bit of brain training can keep people slimmer...perhaps...