system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how come you can donate more than half your liver and it'll grow back in aa few months, but excessive alcohol will permanently scar it?
gpt
Alcohol damages cells indiscriminately; and once you have a lot of damaged cells, the repair mechanisms can’t keep up. When you chop off half of a healthy liver, the remaining healthy cells regrow the missing part.