system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do you sometimes feel nauseous/queasy when you're extremely hungry?

It seems really weird that at a moment when your stomach is almost (if not totally) empty, that you can feel like you're about to throw up.

What's going on there?
gpt
When you have very low blood sugar, your pancreas releases a hormone called glucagon into the blood stream, which triggers the liver to convert stored glycogen into glucose to raise blood sugar levels. A side effect of glucagon is nausea, and we're not really sure why.