system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 : If we die after roughly 3 weeks without eating, why do eat 3 times a day?

I know you wouldn't spend 3 weeks very wealthy or you would lack energy, but still, it seems it's some sort of waste.
gpt
Eating three times a day is actually a modern invention (modern in terms of human history as a species). It wasn’t uncommon, or even unhealthy to eat once a day, or sometimes skip a day every few days. It still isn’t unhealthy to do that today, you are just so used to eating three times a day that it would be difficult.

We die after 3 weeks of not eating because we are healthy and well nourished. If you ate rarely and were malnourished you would die much quicker. We eat daily to make sure we are in top health.