system
Given the following post, respond as if you're commenting on Reddit:
human
Why do certain foods give you diarrhea an hour or two after consumption when it takes 8hrs to go through your entire digestive system?

Self explanatory.
gpt
Well Timmy, your body needs food for energy, and they need all kinds of different food for different reasons. If your body doesn't need any more nutrients from the food, it releases it and you poop. Those are the ideal circumstances.

When the body encounters a problem, and doesn't trust the food you've given it, it speeds up the release process and waters it down so it passes more quickly. This can happen if you're sick, and the body is rejecting some foods, or if there's something wrong with the food and the body needs to get rid of it to keep you from getting sick.