GLP-1: What Is It and What Does It Do?

GLP-1 is an incretin hormone released by cells in the small intestine in response to eating. Its main jobs include stimulating insulin release, reducing glucagon (a hormone that raises blood sugar), and signalling to the brain that you have eaten — creating a sense of fullness. It also slows the rate at which the stomach empties, which contributes to that feeling of satiety lasting longer after a meal.

In people without any medical intervention, GLP-1 is released in short bursts after eating and breaks down very quickly — within minutes. The prescription medicines that act on this pathway are engineered to last much longer in the body, sustaining these effects over the course of a week with a single injection.

What does "natural Mounjaro" mean?

You may have come across the phrase "natural Mounjaro" used informally online to describe foods or drinks — typically high-protein or fibre-rich combinations — that are claimed to trigger a GLP-1 response naturally. This is not a medical term and there is no clinical evidence that any food or drink replicates the effect of a prescribed GLP-1 medicine. While certain foods do prompt a modest release of GLP-1, the magnitude and duration are not comparable to what a prescribed medicine delivers. If you have seen this term and are curious about it, it is worth discussing with your prescriber or doctor rather than substituting anything in your routine.

GLP-1 medicines: two types

The two medicines most commonly discussed in this context work slightly differently. Wegovy contains semaglutide, which acts on GLP-1 receptors. Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP (glucose-dependent insulinotropic polypeptide) receptors — making it a dual agonist. You can read more in the dedicated pages on how the GLP-1 pathway works, what Mounjaro is, and what Wegovy is. For a broader look at the mechanism behind tirzepatide specifically, see the guide on how Mounjaro works.

Both medicines are prescription-only, taken as a once-weekly injection, and are only suitable for people for whom they have been prescribed. According to information published on the electronic Medicines Compendium, both carry additional monitoring requirements — if you experience side effects, report them to your healthcare professional and your national reporting scheme (such as the UK's Yellow Card scheme or the equivalent in your country).

Understanding the mechanism behind your medicine is a useful starting point — but staying consistent week to week is where a lot of the real work happens. GLP Trackr is built specifically for people already on Mounjaro or Wegovy, and its insights and analytics feature is directly relevant here: the app draws on your own logged data — weight, food, mood, energy, sleep — to surface patterns that help you understand what is actually influencing your results.

Because GLP-1 medicines are taken on a weekly schedule, keeping track of each injection is also important. The dose logging feature lets you record every shot — date, time, and dose strength — so you always have a clear picture of your treatment history. That log can also be useful to bring to appointments with your prescriber.

If you notice changes in appetite, energy, or how you feel in the days after an injection, the daily check-in makes it easy to capture those observations in 30 seconds or less. Over time, patterns emerge that are genuinely informative to discuss with your prescriber or doctor.

GLP Trackr is an information and tracking tool — it is not a substitute for clinical advice. Always follow the guidance of your prescriber or doctor; they know your full medical history and are best placed to answer questions about your treatment.

Ready to bring your weekly journey into focus? GLP Trackr is free to try for 7 days — available now on the App Store and Google Play.