The science behind how these injections work
Wegovy contains semaglutide, a GLP-1 receptor agonist. GLP-1 is a hormone your body naturally releases after eating; it signals to the brain that you are full, slows the rate at which your stomach empties, and helps regulate blood sugar. Semaglutide mimics this hormone, amplifying those fullness and appetite signals on a sustained basis throughout the week.
Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors — making it a dual agonist. GIP is another gut hormone involved in appetite regulation and energy balance. By targeting both pathways, tirzepatide engages two complementary appetite-regulating mechanisms simultaneously.
What people commonly notice
Many people on these medicines report a significant reduction in what is often described as "food noise" — the persistent mental preoccupation with food. Appetite can feel noticeably reduced, and feelings of fullness may arrive earlier in a meal. These effects are commonly reported, though they vary from person to person and are not universal. Slower stomach emptying is another frequently described effect; this tends to be most pronounced early in treatment and often lessens over time.
For a broader look at how these medicines are used and what to expect, see our guide to weight loss injections or read more about how the weight loss injection works in more detail. If you have questions about whether the new weight loss injections are safe, that page covers the key considerations — always alongside guidance from your own prescriber.
According to NHS information, these medicines are prescription-only and are used alongside a reduced-calorie diet and increased physical activity as part of a supervised programme.
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 injection journey with GLP Trackr
Understanding how the injection works is only the start — staying consistent with a once-weekly schedule and rotating your injection sites properly is where many people find a structured log genuinely useful.
GLP Trackr's injection-site tracker is built around exactly this. Each time you inject, you record the site — abdomen, thigh, or upper arm — and the app tracks your rotation history, then suggests where to go next. Rotating sites helps avoid localised skin reactions, and having a clear record means you are never guessing. Alongside site tracking, the app's dose logging feature lets you record the date, time, and dose strength of every injection, so your full treatment history is always in one place.
If you ever want to understand patterns in how you are feeling week to week — energy levels, appetite changes, any side effects — the daily check-in captures that alongside your injection data, giving you something concrete to discuss at your next prescriber appointment.
Any decision about your dose or injection schedule belongs with your prescriber or doctor — GLP Trackr helps you record your journey accurately so those conversations are as informed as possible, but it is not a substitute for their clinical guidance. If you experience anything severe, persistent, or concerning, contact your healthcare professional promptly.
You can also explore our overview of the new weight loss injection for more context on what being prescribed one of these medicines involves.
Ready to keep your weekly injection routine on track? GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and let the site-rotation tracker and dose log work for you from your very first injection.
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.
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 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.
They mimic gut hormones — GLP-1 (both medicines) and GIP (Mounjaro only) — that signal fullness and reduce appetite. This leads many people to feel less hungry and more satisfied with smaller meals. Effects vary between individuals.
Wegovy (semaglutide) is a GLP-1 receptor agonist; Mounjaro (tirzepatide) acts on both GLP-1 and GIP receptors. Both are once-weekly prescription-only injections. Which is appropriate for you is a decision for your prescriber or doctor, not something to self-select.
Many people notice appetite changes within the first few weeks, though the timeline varies considerably. Doses are typically started low and adjusted gradually by a prescriber. Individual responses differ, so discuss expected timelines with your own healthcare professional.
Common injection sites include the abdomen, upper thigh, and upper arm. Rotating between sites is generally recommended to avoid skin irritation. Your prescriber or the patient information leaflet for your medicine can guide you on technique and site selection.
Yes — GLP Trackr lets you log each injection by date, dose, and site, and suggests your next rotation site. It also records side effects and daily check-ins, giving you a clear record to share with your prescriber. A free 7-day trial is available on iOS and Android.