system
Given the following post, respond as if you're commenting on Reddit:
human
[ELI5] What is whole grain?

What is whole grain and what does it mean?
gpt
When most companies make bread flour, they usually use just one small part of the wheat grain, called the endosperm, because that makes bread feel softer and look whiter. "Whole grain" means they use most of the rest of the wheat grain (not just the endosperm, but the germ and the bran, too), so you get more nutrients and fiber.