system
Given the following post, respond as if you're commenting on Reddit:
human
[eli5] What happens physically to people when they are heart broken?

I recently broke up with my girlfriend of 3 years and I feel like crap. I never feel like eating, feeling a little bit depressed, and I've had a knot in my stomach ever since. What physically is going on?
gpt
Your brain is telling parts of your body to secrete various hormones in response to the mental stress you're in. For the most part, this is your body's misguided attempt to prolong your life because you're experiencing mental trama.