system
Given the following post, respond as if you're commenting on Reddit:
human
When you are "full" is your stomach really full, or has it just passed a certain threshold where it starts telling you to stop eating?
gpt
Aside from the mechanical effects of stretching the stomach, satiety is also conveyed through fat-tissue-release of leptin. This lets the brain know that at least fat levels within the blood are adequate for the work output. More leptin in the blood = less desire to eat.