system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did humans develop such that a well balanced human diet consist of a wide variety of foods when throughout most of human history we only had access to a few foods?

This seems like it'd doom our survival as a species.
gpt
Eating sub optimally does not mean a swift certain death. It means a slightly lower quality of life (think of how you feel from a week of eating fast food vs a week of eating healthy), deteriorating more quickly (your brain may slow down faster as you age), a slightly higher risk of developing disease, etc.

Good nutrition is just maximizing your optimal health, not something as polarizing as going from dying of every disease at 20 vs living forever.