Hunger claws at your belly. It tugs at your intestines, which begin to writhe, aching to be fed. Being hungry generates a powerful and often unpleasant physical sensation that’s almost impossible to ignore. After you’ve reacted by gorging on your morning pancakes, you start to experience an opposing force: fullness. But how does your body actually know when you’re full?

Learn more about how your body works when it’s hungry and satiated with the help of this TED Ed lesson by Hilary Coller.

Watch these related videos next: How the food you eat affects your gut, You Are Your Microbes, and Sugar: Hiding in plain sight.

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