system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does eating high fibre food prevent us from getting constipation?
gpt
You can't digest/break down fibre. It stays in your gut. When things stay in your gut, it tends to pull water in because the water can't be absorbed into your intestinal wall. That water acts to soften up your poop, making it pass along easier.