How Ozempic works: why a diabetes shot makes people stop feeling hungry
GLP-1: the fullness message from your gut that Ozempic copies
A shot made for diabetes can leave a person full after two slices of pizza. Ozempic copies a message your own gut sends after every meal. Where does that message, GLP-1, start, and which parts of your body read it?
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Every Friday, you share a big pizza with your friend Rono, a taxi driver. Tonight, he stops after two slices. He is not upset, and he is not on a diet. He is just not hungry.
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Six weeks ago, his doctor gave him a new medicine for his diabetes. It is a small shot, once a week, called Ozempic. Since then, Rono's hunger has gone quiet.
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The shot copies a message that your own body sends after every meal. Follow your own pizza. From your stomach, it moves into your small intestine, the long tube where food gets into your body.
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Some cells in the wall of the small intestine can sense food passing by. When food touches them, they send a message into your blood. The message is a hormone called GLP-1.
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A hormone is a message carried by the blood. It works like a key: it acts only on cells that have the right lock.
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Three places that read GLP-1 matter most here. In your pancreas, GLP-1 helps release insulin, which moves sugar out of your blood. In your stomach, it slows food down. And in your brain, it adds to the feeling that you have eaten enough.
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The drug in Rono's shot is a copy of GLP-1, made in a lab. It fits the same locks. So the fullness message reaches Rono's brain all week long, and not only after a meal.
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There is a catch. Your own GLP-1 is gone from your blood in a minute or two. Rono gets one shot a week, and it works all week long.
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Quick check
Sugar in a vein.
Show the answer
No, or hardly. Those cells sit in the wall of the gut and react to food passing by them. Sugar in a vein never touches them.
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