How GLP-1 Medication Works in the Body
GLP-1 stands for glucagon-like peptide-1, a hormone your gut naturally releases after eating. GLP-1 receptor agonists are medicines that act on the same receptors as this hormone, producing several effects that are commonly associated with appetite and fullness.
The main mechanisms
- Reduced appetite and food noise: By acting on appetite-regulating pathways in the brain, many people report a significant quietening of thoughts about food and a reduced drive to eat.
- Increased sense of fullness: These medicines slow how quickly the stomach empties, which commonly leads to feeling satisfied on smaller amounts of food.
- Blood-sugar regulation: GLP-1 receptor agonists support the release of insulin in response to meals and reduce the release of glucagon, helping to stabilise blood-sugar levels.
Mounjaro and Wegovy: the same family, different mechanisms
Wegovy contains semaglutide, a GLP-1 receptor agonist. Mounjaro (tirzepatide) works on both GLP-1 and a second receptor — GIP (glucose-dependent insulinotropic polypeptide) — making it a dual agonist. You can read more in our overview of GLP-1 medication and in our guide to how GLP-1 works.
Both medicines are taken as once-weekly injections, starting at a low dose that is adjusted over time by your prescriber. The specific dose schedule and titration is always decided by your prescriber or doctor based on your individual circumstances — not a decision to make on your own.
These medicines are not insulin, and they are not suitable for everyone. Suitability is assessed by a prescriber. According to NHS guidance, these treatments are intended to be used alongside dietary changes and increased physical activity, under clinical supervision.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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Tracking Your GLP-1 Journey with GLP Trackr
Understanding what GLP-1 medication does is one thing — tracking how it affects you personally is where real insight comes from. GLP Trackr is a companion app built specifically for people already prescribed Mounjaro or Wegovy, and it is designed to help you stay consistent and informed throughout your treatment.
The daily check-in feature lets you record your weight, mood, energy levels, food noise, sleep, and water intake in around 30 seconds each morning. Over time, this builds a picture of how your body is responding week by week — patterns that can be genuinely useful to bring to your next prescriber appointment. The app also includes an insights dashboard that surfaces correlations across your data, so you can see what is and is not shifting over time.
For a broader overview of how Mounjaro fits into all of this, the Mounjaro hub is a good place to explore next.
Important: GLP Trackr is a tracking and journaling tool — it is not a source of medical advice and does not replace the guidance of your prescriber or doctor. If you have any questions about your treatment, dose, or side effects, always speak with your healthcare professional. They know your full history and are best placed to advise you.
Ready to start making sense of your journey? Download GLP Trackr on the App Store or Google Play and try it free for 7 days — no commitment needed.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
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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.
Injection Tracking
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.
Hydration Reminders
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.
Smart Meal Planning
Personalized meal plans built around your current dose phase and side effects. Every meal is GLP-1 optimized — high in protein, gentle on the stomach, and scaled to your reduced appetite.
Recipe Library
Browse 50+ high-protein, GLP-1-friendly recipes filtered by meal type, prep time, and dietary needs. Every recipe includes full nutrition info, step-by-step instructions, and tips for eating with side effects.
Progress Analytics
Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
AI Meal Scanning
Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
Exercise & Steps
Log walks, workouts, and movement with activity targets that flex with your energy levels. On lower-energy dose days, gentler targets keep you moving without burning out.
Community Support
Connect with thousands of others navigating the same medication journey. Share milestones, ask questions, find accountability partners, and get support from people who truly understand.
Never Forget a Dose Again.
Log your Mounjaro or Wegovy injection in seconds. Track your pen, your dose level, and your injection site — so you always know exactly where you are in your treatment.
Watch Your Body Transform, Week by Week.
Log your weight, measurements, and how you're feeling after each dose. GLPTrackr turns your data into clear, motivating charts that show you how far you've really come.
You're Not on This Journey Alone.
Connect with thousands of real GLP-1 users sharing their wins, side effect tips, and meal ideas. Get the support of people who truly get it — because they're living it too.
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The first AI built exclusively for GLP-1 weight loss. Every insight, every meal plan, every prediction trained on one thing only: helping you get the most out of your medication.
Knows Your Cycle
GLPIQ tracks where you are in your injection cycle and adjusts everything around it: lighter meals on nausea days, higher protein when appetite returns, and smarter targets as your medication level shifts.
Predicts Before You Feel It
GLPIQ learns your personal side effect patterns over time. After a few cycles, it starts warning you the morning before a rough day — and adjusts your meal plan automatically.
Finds Your Golden Dose
GLPIQ analyses every dose you've been on: weight loss rate, side effects, food noise, mood, protein adherence and tells you which dose gave you the best results. No other app does this.
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Frequently asked questions.
GLP-1 medications are prescription-only injectable medicines that mimic the glucagon-like peptide-1 hormone. They act on appetite-regulating pathways and slow stomach emptying. Examples include semaglutide (Wegovy) and tirzepatide (Mounjaro), both taken as once-weekly injections under prescriber supervision.
These medicines act on GLP-1 receptors in the brain and gut, which are involved in hunger signalling and feelings of fullness. Many people report reduced food noise and feeling satisfied with smaller meals. Effects vary between individuals and are most noticeable as the dose is established.
A GLP-1 receptor agonist such as semaglutide (Wegovy) acts on one receptor type. Tirzepatide (Mounjaro) is a dual agonist that also activates GIP receptors. Both are prescription-only. Your prescriber decides which, if either, is appropriate for you.
No. Dose decisions — including when to adjust or titrate — belong entirely with your prescriber or doctor. They will tailor your schedule based on your response and medical history. Never change your dose without speaking to your healthcare professional first.
GLP Trackr is a companion app for people already prescribed Mounjaro or Wegovy. It lets you log your daily check-in, track weight, mood, energy and food noise, and review insights over time. It is a tracking tool, not a medical service, and is free to try for 7 days.