What the GLP-1 Hormone Does in the Body
GLP-1 is released by specialised cells in the small intestine in response to food. Once in the bloodstream, it acts on several systems at once — signalling to the brain that you have eaten, slowing the rate at which the stomach empties, and helping to regulate insulin release. The combined effect is a stronger, more sustained sense of fullness and a reduction in what many people describe as constant background hunger, sometimes called "food noise".
GLP-1 and appetite regulation
The appetite-suppressing effect of GLP-1 comes primarily from its action on receptors in the hypothalamus — the part of the brain involved in hunger and satiety signalling. In people with natural GLP-1 production, this effect is relatively short-lived after a meal. GLP-1 receptor agonist medicines are designed to mimic and extend this hormonal signal over a longer period.
How prescribed medicines relate to this hormone
Medicines in the GLP-1 receptor agonist class — including semaglutide (the active substance in Wegovy) and tirzepatide (the active substance in Mounjaro, which also acts on a second hormone pathway called GIP) — are engineered to bind to the same receptors as natural GLP-1 but with a much longer duration of action. This is why they are taken once weekly rather than with every meal. You can read more about how GLP-1 receptor agonists work and explore GLP-1 medications in more detail in our related guides.
Commonly reported effects linked to GLP-1 activity
Because GLP-1 slows stomach emptying, it is also associated with some of the gastrointestinal effects many people notice early in treatment — such as nausea, a feeling of fullness after small amounts of food, or changes in digestion. These are commonly reported and often ease over time, but if you experience anything severe or persistent, contact your healthcare professional promptly. For a broader look at what to expect, our overview of GLP-1 side effects and experiences covers this in more depth.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Your GLP-1 Journey with GLP Trackr
Understanding the GLP-1 hormone is one thing; noticing how it actually shows up in your daily life is another. GLP Trackr's daily check-in feature lets you log food noise levels, hunger, energy, and mood each morning — so over time you can see how your body's response to your prescribed medicine shifts week by week. That pattern is often far more informative than a single weigh-in.
The app's side-effect tracking is also directly relevant here: because GLP-1 activity affects digestion and appetite, logging symptoms like nausea or changes in fullness helps you spot whether they are improving, staying stable, or worth raising with your prescriber. The insights and analytics tools can surface correlations between how you eat, how you feel, and how your weight is moving — giving you something concrete to discuss at your next appointment.
GLP Trackr supports people already on Mounjaro and Wegovy, wherever they are in their journey. If you are looking for broader context on your treatment, the Mounjaro hub brings together guidance on dosing, side effects, nutrition, and more in one place.
Always follow the guidance of your prescriber or doctor — they know your full medical history and are best placed to interpret how your body is responding. GLP Trackr helps you record what you notice so those conversations are richer and better informed, not as a substitute for clinical advice.
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Morning Check-In
Start every day with a 60-second wellness check-in. Log how you're feeling, track nausea, appetite, energy, and mood — giving you and your care team a complete picture of how your medication is working.
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Log every dose with a single tap. Track your dose history, phase in your cycle, estimated medication levels, and upcoming injection dates — with reminders so you never miss a scheduled shot.
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Staying hydrated is especially important on GLP-1 medications. Set daily water targets, log intake throughout the day, and receive smart nudges when you're falling behind your goal.
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Frequently asked questions.
GLP-1 (glucagon-like peptide-1) is a hormone released by the gut after eating. It signals fullness to the brain, slows stomach emptying, and helps regulate insulin. GLP-1 receptor agonist medicines are designed to mimic and extend this natural hormonal effect.
Medicines like semaglutide and tirzepatide bind to the same receptors as natural GLP-1 but remain active much longer — which is why they are taken once weekly. Tirzepatide also acts on a second hormone pathway (GIP). Your prescriber will have chosen the right medicine for your situation.
GLP-1 slows the rate at which the stomach empties food into the intestine. This is part of how it promotes fullness, but it can also cause nausea, particularly early in treatment or after a dose adjustment. For many people this eases over time. If nausea is severe or persistent, speak to your healthcare professional.
Yes. Logging daily food noise, hunger levels, mood, and any side effects in a tracking app like GLP Trackr lets you see patterns over time. This kind of record can be useful to share with your prescriber to help them understand how your treatment is going.
No. GLP-1 and GIP (glucose-dependent insulinotropic polypeptide) are two distinct gut hormones. Some prescribed medicines target only GLP-1 receptors, while others — such as tirzepatide — target both. Your prescriber decides which medicine is appropriate for you.