system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why Do I Feel Like Throwing Up After Running Or Working Out Too Hard?
gpt
When you train, blood is withdrawn from your digestive organs and reassigned to the muscles. If you train too hard, the digestive organs lack sufficient blood and energy supply and are struggling to do their work properly.

Given you still have food to be digested, your body is preparing to get rid of it in order to free up more resources, currently needed to digest.