system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can I eat a massive meal, and get to the point when I'm so full I cant even imagine eating another bite, but I would love to eat some chocolate?
gpt
We're pretty much hard wired to get sugar whenever we can, since it's such a useful source of energy. When we were hunter-gatherers, sources of lots of sugar were hard to come by and it was a good survival strategy to grab any you found. Now that you can buy your own weight in chocolate from any grocery store, our instincts are a bit off.