system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5- if snakes must shed their skin because it doesn’t stretch, how can they eat things so large that it stretches out the skin along the snake’s body?

I’m not asking about the jaw thing they do but the actual skin along the body after the snake has swallowed the egg or rat or deer or whatever.
gpt
Ok, it's not that a snakes skin doesn't stretch, it's that the skin doesn't grow with the snake. 

Think if it like a sock, you might still be able to stretch a small sock over your foot, but you'd rather have a sock that fits correctly. So they discard the overly tight sock, and replace it with a more appropriately fitting one.

This has the added benefit of helping keep their skin clear of parasites and other harmful infections.