system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is eating fiber (which goes through my digestive system) good for my heart?
gpt
Your body uses cholesterol to make bile, which is what allows you to break down fats in the small intestines. Fiber binds cholesterol in your food and the bile you secrete. That bile would otherwise be reabsorbed into your body. So the fiber gets the bile out through feces, and your body is forced to make more bile from the cholesterol you have in your body. Without getting into too much detail, high levels of some types of cholesterol can cause blood vessel damage, which is why its bad for your 'heart.'