How the Weight Loss Injection Works in the Body
Mounjaro and Wegovy belong to a class of medicines that act on receptors involved in regulating appetite and blood sugar. Wegovy contains semaglutide, a GLP-1 receptor agonist — it mimics a hormone your gut naturally releases after eating, signalling to the brain that you are full. Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors, making it a dual-action medicine. You can read more about the underlying mechanisms on our page covering how the weight loss jab works.
What people commonly notice
- Reduced appetite and "food noise" — the mental chatter about food that many people find quietens noticeably on these medicines.
- Feeling full more quickly — partly because these medicines slow gastric emptying, meaning food leaves the stomach more gradually.
- Lower overall calorie intake — a natural consequence of reduced hunger, rather than forced restriction.
What the injection does not do
These medicines are not a passive fix — they work best alongside consistent habits around food and activity, guided by your prescriber or doctor. They are prescription-only, not suitable for everyone, and suitability is always a decision made with a healthcare professional. For a broader look at this topic, our weight loss injections guide covers what to expect across the whole journey.
It is also worth knowing that some commonly reported effects — particularly slower stomach emptying — can contribute to side effects such as nausea, especially early on or after a dose adjustment. These effects are frequently described as temporary, though experiences vary considerably from person to person. According to NHS guidance, these medicines should always be used as part of a supervised programme that includes dietary and lifestyle support.
If you are curious about what these medicines cost in different settings, our page on the cost of the weight loss injection explains what factors are generally involved, without quoting specific prices.
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 What the Injection Is Doing for You
Knowing what the jab is supposed to do is one thing — seeing what it is actually doing for you is where tracking becomes genuinely useful. GLP Trackr is built specifically for people already on Mounjaro or Wegovy, and the feature that tends to matter most early on is the daily check-in: a quick morning log of your weight, hunger levels, food noise, mood, energy, and sleep. Over days and weeks, patterns emerge that are easy to miss when you are living through them one day at a time.
Alongside the check-in, the app's side-effect tracker lets you note symptoms like nausea or fatigue in the moment — so when you speak to your prescriber, you have a clear, dated record rather than a vague impression. You can also explore the science behind the injection in more detail if you want a deeper understanding of the mechanisms involved.
Any concerns about how the medicine is affecting you — whether a symptom feels unusual, persistent, or worrying — should always be discussed with your prescriber or doctor promptly. GLP Trackr records what you experience so that conversation is as informed as possible; it is not a substitute for professional guidance.
Ready to start seeing your own data come together? Download GLP Trackr on the App Store or Google Play and explore it free for your first 7 days — no commitment needed.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
Everything your GLP-1 journey needs. Free to try for 7 days.
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.
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The Most Advanced GLP-1 Brain Ever Built.
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.
Weight loss injections like Mounjaro and Wegovy mimic hormones that regulate appetite, helping many people feel fuller sooner and reducing overall hunger. Mounjaro acts on two hormone pathways (GLP-1 and GIP); Wegovy acts on one (GLP-1). Both are prescription-only medicines.
Many people notice some reduction in appetite relatively early, though the full effect typically builds over time as the dose is adjusted by their prescriber. Individual responses vary considerably, and your prescriber is best placed to guide your expectations.
These medicines are generally prescribed as part of a programme that includes dietary and lifestyle support. They are not intended as a standalone solution, and your prescriber or doctor will advise on what approach is right for your individual circumstances.
Nausea, constipation, diarrhoea, and indigestion are among the most commonly reported effects, particularly in the early weeks. These often ease over time. If any symptom is severe, persistent, or worrying, contact your healthcare professional promptly.
Yes — GLP Trackr lets people already on Mounjaro or Wegovy log daily hunger levels, food noise, mood, weight, and side effects. This builds a personal record you can discuss with your prescriber to understand how the medicine is working for you specifically.