Food can be (and there are those that are) designed to optimize for the desire to eat more. Slot machines payouts are designed to encourage people to play one m

Food can be (and there are those that are) designed to optimize for the desire to eat more. Slot machines payouts are designed to encourage people to play one more time. There are games that are famous for eliciting "one more turn... oh my god it's 5 a.m. already". When a stimulus reliably elicits a particular response on a large enough population, you can reasonably say that it's the stimulus and not the individual's failure to apply moderation/critical thinking/what-have-you.