system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How exactly does someone die from drinking too much water?

I want to know this because when me and my sister were kids we had a bet on who could drink the most cups of water, we pretty much drunk water till we felt sick and could piss water like a fire hydrant so im wondering if at any point either me or my sister could have dropped dead at the time.
gpt
Too much water causes sodium to leave the cells and enter the blood. This gradual dilution isn't a problem except the sodium is lost in small amounts as you urinate. Eventually enough sodium is lost to where muscle cells cannot function and your heart does not reliably generate an electrical impulse to beat. There are also problems with the brain that would lead to death, but the heart is the easiest to explain.