GLP-1 (glucagon-like peptide-1) is a natural hormone your gut releases after you eat. It helps you feel full, signals to your pancreas to release insulin, and slows how quickly food leaves your stomach, working together to steady your blood sugar and gently curb your appetite.
GLP-1 is made by cells in your gut lining (called L-cells) and released when you eat.
It's an “incretin” hormone, incretins drive a large share of the insulin you release after a meal. It signals fullness to your brain and slows stomach emptying, so you feel satisfied for longer. Your body breaks it down within minutes, via an enzyme called DPP-4.
GLP-1 medications are lab-made versions built to last far longer than your own GLP-1
What does GLP-1 do?
GLP-1 is a multitasker. After a meal, it does four main jobs and together they help you feel satisfied and keep your blood sugar steady.
Signals fullness: It acts on the appetite centres in your brain, helping you feel satisfied and naturally eat a little less.
Helps release insulin: It prompts your pancreas to release insulin but mainly when blood sugar is high (a “glucose-dependent” effect), which helps avoid lows.
Lowers glucagon: It dials down glucagon, a hormone that raises blood sugar another way it keeps levels steady.
Slows gastric emptying: It slows how fast food leaves your stomach, so a meal keeps you fuller for longer.
Where does GLP-1 come from?
GLP-1 is produced by L-cells concentrated in the lower part of your small intestine and your large intestine. They act like sensors: when food arrives, they respond to protein and amino acids, to certain fats, and to the short-chain fatty acids your gut bacteria make when they ferment fibre and release GLP-1 in response. That's exactly why what you eat shapes the signal something we cover in Foods that naturally support GLP-1.
Why don't we feel it more?
Here's the catch: your own GLP-1 doesn't hang around. An enzyme called DPP-4 breaks it down within about two minutes, so only a small fraction ever reaches the rest of your body. This is one reason your natural GLP-1 works gently and briefly a nudge, not a switch.
Is GLP-1 the same as Ozempic?
This is where people often get confused. GLP-1 is a hormone your body makes. GLP-1 medications (sometimes called GLP-1 receptor agonists) are prescription medicines engineered to mimic that hormone. But built to resist the DPP-4 enzyme, so they last far longer and reach much higher levels than your body's own GLP-1.
That's why their effects on appetite and blood sugar are so much stronger.
These medicines are prescription-only and used under medical supervision, mainly for type 2 diabetes and, in some cases, weight management. In short: the hormone is natural; the medications are a separate, doctor-managed thing. This article is about the hormone, if you have questions about a medication, your GP or pharmacist is the right person to ask.
Can you support your own GLP-1 naturally?
Yes, gently. The foods and habits that trigger a healthy GLP-1 response are simply good eating: meals built around protein and fibre, with healthy fats and a well-fed gut. It won't match a medication, but it's a sustainable way to work with your body.
