system
Given the following post, respond as if you're commenting on Reddit:
human
What happens in the body to create the "loss of appetite" sensation after experiencing something unpleasant?
gpt
Activation of the sympathetic nervous system and the neuroendocrine stress response. This puts the body in what is termed "fight or flight" mode by diverting blood flow away from the internal organs and more towards the skeletal muscles, and by causing pupillary and bronchial dilatation as well as other effects.