What GIP and GLP-1 actually do — and how Mounjaro uses both
GIP stands for glucose-dependent insulinotropic polypeptide, and GLP-1 stands for glucagon-like peptide-1. Both are naturally occurring hormones released by the gut after eating. Each plays a role in signalling fullness, influencing appetite, and supporting the body's response to food intake.
GLP-1: the better-known pathway
GLP-1 receptor agonists have been used in weight management for several years. When GLP-1 receptors are activated, many people experience a stronger sense of fullness after eating, reduced appetite, and — commonly reported with this drug class — a quietening of persistent food-related thoughts sometimes called "food noise". You can read more about how GLP-1 works in weight management and explore GLP-1 medicines more broadly for additional context.
GIP: the second mechanism in Mounjaro
GIP receptor activation is thought to complement the GLP-1 pathway rather than simply duplicate it. Research suggests that GIP signalling may influence fat tissue and energy storage, as well as contributing to appetite regulation through different neural pathways. The combined effect of activating both receptors simultaneously is what defines tirzepatide as a dual agonist — a mechanism distinct from semaglutide, which targets GLP-1 only.
GIP vs GLP-1: what the difference means in practice
When comparing GIP vs GLP-1 receptor activity, the key point is not that one pathway is superior to the other, but that tirzepatide engages both at the same time. Whether this dual action is the right approach for any individual is entirely a matter for their prescriber — it depends on personal health history, other medications, and clinical judgement. For a direct factual comparison of the two medicines, see Mounjaro and GLP-1: what you need to know.
As with all prescription-only medicines, Mounjaro carries a black triangle (▼) designation in some countries, meaning it is subject to additional monitoring. If you experience side effects, report them through your national reporting scheme (such as the UK's Yellow Card scheme) and speak with your healthcare professional.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking your Mounjaro journey with GLP Trackr
Understanding the mechanism behind your medicine is useful context — but staying consistent week to week is where the real work happens. GLP Trackr's insights and analytics feature is particularly relevant here: once you've been logging your doses, weight, energy, and food over time, the app surfaces correlations from your own data — helping you see what's actually shifting and when.
Alongside that, the daily check-in lets you record how you're feeling each morning in about 30 seconds: weight, mood, energy, food-noise level, sleep, and water. Over weeks, these data points build a picture of how your body is responding that you can bring to your prescriber appointments — the app's doctor report feature makes it easy to share a clear summary.
GLP Trackr is a tracking and journaling tool, not a clinical service. Any questions about how Mounjaro's mechanism relates to your individual response should be directed to your prescriber or doctor — they know your full history and are best placed to interpret what you're experiencing. For a broader overview of Mounjaro, visit the Mounjaro hub.
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Frequently asked questions.
GIP (glucose-dependent insulinotropic polypeptide) is a gut hormone involved in appetite regulation and energy storage. Mounjaro (tirzepatide) activates both GIP and GLP-1 receptors simultaneously, making it a dual agonist — a mechanism that differs from medicines targeting GLP-1 alone.
GLP-1 and GIP are both gut hormones released after eating. GLP-1 is associated with increased fullness and reduced appetite. GIP is thought to additionally influence fat tissue and energy pathways. Tirzepatide targets both; semaglutide targets GLP-1 only. Your prescriber can explain what this means for your individual situation.
Whether Mounjaro is appropriate for any individual compared with a GLP-1-only medicine is a clinical decision for a prescriber — it depends on personal health history and circumstances. Neither approach should be described as universally superior; suitability varies from person to person.
GLP Trackr lets you log doses, weight, mood, energy, and food-noise daily. Its insights feature surfaces patterns from your own data over time, and the doctor report helps you share a clear summary with your prescriber — useful context when discussing how you're responding to treatment.