system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we eat some grains, like rice or corn, by themselves, but we almost always grind wheat into flour?

I know that there is rice flour and corn flour as well, but I have never seen anyone eat wheat grains by themselves.
gpt
Wheat has been specifically bred over time for grinding. It's generally not used as human food without processing -- not that you can't, we just don't.

Wheat flour is also fairly typical of Old World culture -- rice flour dominates in the East, while natives in the New World were using corn flour as they didn't have wheat.