system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do we make such bad decisions related to food when we're hungry?
gpt
One of the reasons is that self-control is actually a resource that can be depleted. The brain has to expend more energy to exhibit self-control rather than just doing what it wants. Want to guess what form that energy takes? Glucose! That's right, sugar. So, when your sugar levels drop you actually have less ability to exhibit self-control.

That's why it's a good idea to have your meals planned and prepared before you're insanely hungry because you won't have the self-control to stop yourself from going to McDonald's.