system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If diabetic people can have dangerously low sugar from not eating, how can non-diabetic people go on fasts, or skip meals?

I understand when blood sugar gets to high, and in theory when it gets too low. However, I don't understand how my fitness crazed cousin can do intermittent fasting (only eats during a 4 hour window each day) and regular 3-5 day water fasts wouldn't have the same issue.
gpt
Diabetic people have trouble metabolizing sugar, and so must inject insulin to properly use glucose. But if they have insulin and not enough sugar, such as from not eating, their blood sugar can drop too low.

However someone without diabetes shouldn't have trouble with intermittent fasting because their body can adjust insulin levels itself to compensate for the different levels of food and thus sugar intake.