How GLP-1 Receptor Agonists Work
GLP-1 is released from the gut in response to food and sends signals to the brain that help reduce hunger — sometimes described as quieting "food noise". GLP-1 receptor agonists replicate this signalling by binding to the same receptors, which is why reduced appetite and a greater sense of fullness are among the most commonly reported effects.
The two medicines most people on this journey are prescribed
The GLP-1 receptor agonists most widely prescribed for weight management are semaglutide (the active substance in Wegovy) and tirzepatide (the active substance in Mounjaro). Both are once-weekly injectable medicines supplied as pre-filled pens. Tirzepatide is a dual agonist — it also activates GIP (glucose-dependent insulinotropic polypeptide) receptors alongside GLP-1 receptors. You can read more about how the GLP-1 receptor itself works and explore a deeper look at semaglutide as a GLP-1 receptor agonist in the related guides on this site.
Common effects people report
- Reduced appetite and food-noise
- Increased sense of fullness after smaller meals
- Slower gastric emptying (which can contribute to nausea, particularly early on)
- Gastrointestinal side effects such as nausea, constipation, or loose stools, especially around dose changes
These effects are commonly reported but are not universal, and how strongly any individual experiences them varies. For a broader overview of the medicines in this class, see the guide to GLP-1 receptor agonist medicines on GLP Trackr.
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.
AI Meal Tracking. Built for GLP 1 Appetites.
Point your camera at any meal and let our AI do the rest. Breakfast, doses, weight, mood all tracked in seconds.
Tracking Your GLP-1 Journey with GLP Trackr
Understanding what GLP-1 receptor agonists do is one thing — making sense of how they are affecting you, day to day, is another. GLP Trackr's side-effect and symptom tracker lets you log how you feel after each dose, so patterns become visible over time: whether nausea clusters around injection day, how energy shifts across the week, or when appetite changes feel most noticeable.
Alongside symptom logging, the app's daily check-in captures mood, energy, food-noise levels, sleep, and weight in around 30 seconds each morning — building a personal record that is genuinely useful to bring to appointments with your prescriber. The insights tools then surface correlations across your own data, turning a scattered diary into a clear picture of your progress.
For those already taking Mounjaro (tirzepatide), the app also logs each injection — dose strength, date, and site — so nothing gets lost in a weekly routine.
If any side effect is severe, persistent, or worrying, contact your healthcare professional promptly. GLP Trackr helps you record what you are experiencing so you can have an informed conversation with your prescriber — it is not a substitute for their guidance, and any decisions about your treatment belong with them.
Ready to bring some clarity to your GLP-1 journey? Download GLP Trackr free on the App Store or Google Play — there is a 7-day free trial waiting for you.
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.
Download on the App Store Download on the Google Play
Founding Member Offer
One plan. Everything included. No hidden extras.
Founding Member
Exclusive Offer
Join the first 1,000 membersand lock in our lowest ever price
Offer expires in:
786 of 1000 founding spots remaining
50% OFF
Lifetime Price Lock
Never pay full price • Forever
🔒 No credit card required • Cancel anytime
Premium
Ad-free- Track weight, meals, water, exercise, & sleep
- Log doses, injection sites, & side effects
- 60-second daily morning check-in
- AI meal scanning & barcode scanning
- Personalised AI meal plans & recipes
- Golden Dose Finder AI
- Medication Clock — real-time level tracking
- Daily Brief and predictive side effects
- Full insights & weekly transformation cards
- Unlimited progress photos
- Doctor PDF export & body measurements
- Community Access—Connect with GLP-1 users
Powered by
🔒 No credit card required • Cancel anytime
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.
Download glptrackr today.
Available on iOS and Android. 7-day free trial, no credit card needed.
Frequently asked questions.
A GLP-1 receptor agonist is a prescription medicine that activates the same receptors as the body's natural GLP-1 hormone. This helps regulate appetite and supports feelings of fullness. Semaglutide and tirzepatide are two examples prescribed for weight management.
These medicines bind to GLP-1 receptors in the brain and gut, mimicking signals the body sends after eating. Many people report reduced hunger and less preoccupation with food, though the degree of effect varies from person to person.
A GLP-1 receptor agonist activates GLP-1 receptors only, as semaglutide does. A dual agonist like tirzepatide also activates GIP receptors. Both are prescription-only medicines; which is appropriate for you is a decision for your prescriber.
Gastrointestinal effects such as nausea, constipation, or loose stools are commonly reported, particularly early on or around dose changes. They are not universal. If any symptom is severe or persistent, speak with your healthcare professional promptly.
Yes. GLP Trackr lets you log side effects, mood, energy, food-noise, and weight daily, helping you spot patterns over time. This record can be useful to share with your prescriber. The app is available free on the App Store and Google Play with a 7-day trial.