Hello and welcome to another edition of The Weekly Dose!

You're watching the scale drop, and honestly — it feels incredible. But here's something most people on GLP-1 medications don't discover until it's too late: the scale can't tell you what you're losing, only how much. On Mounjaro, Wegovy, Ozempic, and Zepbound, that distinction could be the difference between results that last a lifetime and results that reverse within a year. Today, we're breaking down exactly why body composition — not the number on the scale — is the metric that will define your long-term success.

💡 Let's dive in!

📌 Here's what's inside this issue:
✅ Announcement: The Weekly Dose Community is LIVE!
✅ Main Topic: 5 Reasons Why Body Composition Matters More Than Scale Weight on GLP-1s
✅ Research Recap: What the Science Says About Lean Mass on GLP-1 Medications
✅ Question of the Week: How are you tracking your body composition?

💊 Not on a GLP-1 yet? Zealthy offers 100% online GLP-1 weight loss care — get started for just $39, with or without insurance. 200,000+ prescriptions written. → Check your eligibility here

Quick Reminder: The Weekly Dose Community is LIVE!

If you've been waiting for a place to stay accountable, share progress, and connect with others on the GLP-1 journey — it's here.

Inside the Weekly Dose Skool Community, you'll find: 🏆 Weekly Wins — celebrate your progress and get inspired by others 📊 Accountability Challenges — small, sustainable goals to keep momentum 💬 Peer Support & Q&A — ask questions, get real feedback, share what's working 🎥 Expert Insights — resources and replays from trusted health pros

Whether you're on Mounjaro, Wegovy, Ozempic, Zepbound, or just starting out — this space was built for you.

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Let's keep showing up for ourselves — and for each other. 💪🚀

Studies show that 25–39% of the total weight lost on GLP-1 medications can come from lean muscle mass, not fat — a finding consistent across multiple clinical analyses, including a 2024 systematic review published in Obesity Reviews. Most people focusing solely on the scale are watching the wrong number. Understanding what your body is actually losing — and protecting against the wrong kind of loss — is what separates a transformation that lasts from one that unravels.

Here's what separates the people who sustain their results long-term from those who struggle to keep the weight off: they aren't just watching the scale go down. They're watching what's staying up.

A few years ago, most weight loss conversations were simple: calories in, calories out, watch the scale. GLP-1 medications changed that conversation dramatically. The appetite suppression is powerful enough that many users eat significantly fewer calories — sometimes too few, and often without enough protein. The result? Rapid weight loss that looks great on the scale but tells an incomplete story about what's actually happening inside the body. Today, with millions of people on GLP-1s, understanding what type of weight you're losing is more important than ever.

Here's the hidden reality nobody talks about at the starting line: your scale measures everything at once — fat, muscle, bone, water, and organs — lumped together into one number. When you eat less (which GLP-1 medications make remarkably easy), your body pulls energy from whatever source is most available. Fat stores are the goal. But muscle is also accessible — especially when protein intake is insufficient.

Sound familiar? This is why two people on the same medication, same dose, same timeline can look and feel completely different at the same weight. The scale doesn't explain it. Body composition does.

This is the system flaw hiding beneath every GLP-1 success story that eventually stalls. Here's how it unfolds:

Here's what makes this especially frustrating: the scale might keep going down even as your metabolism is slowing. The weight you're losing in later months might be more muscle than fat. And when the medication stops or the dose changes? The math works against you.

The good news is that this is entirely preventable — and the fix is simpler than most people expect.

One of the most effective tools for protecting lean mass on a GLP-1 is creatine. Research shows it supports muscle endurance, power output, and lean body mass retention — exactly what GLP-1 users need when appetite suppression makes it hard to eat enough. In our community, we use Thorne Creatine — 5g creatine monohydrate per scoop, NSF Certified for Sport, gluten/soy/dairy free. (Fun fact: I personally take a double dose as part of my own daily stack.)

Here's a market truth that doesn't get enough airtime: GLP-1 medications suppress appetite so effectively that hitting daily protein targets becomes a real challenge. The International Society of Sports Nutrition Position Stand (Jäger et al., Journal of the International Society of Sports Nutrition, 2017) recommends 1.4–2.0 grams of protein per kilogram of body weight for active individuals — and even lower-end targets can be difficult to reach when nausea or early satiety limits how much you can eat.

A practical target: aim for 0.7–1.0 grams of protein per pound of body weight daily. At 200 pounds, that's 140–200 grams of protein. For most people eating on a GLP-1-suppressed appetite, hitting that number takes a plan — not guesswork.

Here's where most processes break down. People start a GLP-1, the weight starts falling, and resistance training feels optional — something to add "later" when they have more energy or motivation. But this is the process gap that separates transformations from temporary wins.

Think about it this way: a scale can't tell you that you built muscle this week. But your clothes fitting differently, your energy being higher, and your strength increasing? Those are body composition changes the scale will never show you.

What do the people who successfully keep the weight off after a GLP-1 journey do differently? Research and clinical observation point to one pattern consistently:

The challenge for this week: take one body composition measurement today. Anything — a waist measurement, a photo, a body fat reading. Take it again in four weeks. The scale will give you one number. Your body composition data will tell you the actual story.

All five reasons point to the same thing: GLP-1 medications create the conditions for fat loss. Your habits — protein intake, resistance training, and tracking the right metrics — determine whether that fat loss is lasting. Start with one action this week. Bump your protein intake by 20 grams. Add one resistance training session. Take a baseline measurement. Small, consistent steps compound into the kind of transformation the scale will never fully capture.

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One of the biggest open questions in GLP-1 research right now is this: as people lose significant amounts of weight on these medications, how much of what they lose is fat — and how much is muscle? Researchers have been studying this closely, and the findings carry real implications for anyone currently on a GLP-1 journey.

✔️ A 2024 systematic review and network meta-analysis published in Obesity Reviews found that GLP-1 receptor agonists produce significant total weight loss, but that a meaningful proportion of that loss can come from lean mass — underscoring the importance of lifestyle behaviors (particularly resistance training and protein intake) alongside medication use.

✔️ The SURMOUNT-1 trial (Jastreboff AM et al., New England Journal of Medicine, 2022), evaluating tirzepatide (the active ingredient in Mounjaro and Zepbound), demonstrated dramatic weight loss outcomes but also highlighted that patients engaging in structured exercise and meeting protein targets showed better lean mass preservation relative to sedentary participants.

✔️ According to the International Society of Sports Nutrition Position Stand (Jäger R et al., Journal of the International Society of Sports Nutrition, 2017), protein intakes of 1.4–2.0 grams per kilogram of body weight per day are associated with significantly better muscle retention during calorie-restricted weight loss periods — a recommendation directly applicable to GLP-1 users managing reduced appetite.

The science is telling us clearly: GLP-1 medications are a powerful tool, but they work best when paired with deliberate nutritional and exercise habits. Protecting muscle isn't just about aesthetics — it's about preserving the metabolic infrastructure that will carry your results forward for years to come. You're already doing the hard work by being on this journey. Now it's about making that work count in all the right ways.

Note: A specific ScienceDaily research article URL was not included with this issue submission. For the published version, Carlos — please link to a relevant source in the "Read it here" spot below, or provide the article URL to update this section.

Want to read the research? Read it here.

Research suggests that 25–39% of total weight lost on GLP-1 medications can come from lean muscle mass rather than fat, though this varies based on protein intake and exercise behavior. A 2024 systematic review in Obesity Reviews confirmed this range across multiple GLP-1 trials and highlighted that patients who engaged in resistance training and met protein targets showed meaningfully better lean mass retention than those who did not.

Tirzepatide, like other GLP-1 medications, does not directly cause muscle loss — but the calorie restriction it enables can lead to muscle breakdown if protein intake and resistance training are insufficient. The SURMOUNT-1 trial (Jastreboff AM et al., New England Journal of Medicine, 2022) demonstrated that participants who paired tirzepatide with structured lifestyle behaviors preserved lean mass more effectively than those who relied on medication alone.

The International Society of Sports Nutrition Position Stand (Jäger R et al., Journal of the International Society of Sports Nutrition, 2017) recommends 1.4–2.0 grams of protein per kilogram of body weight daily for active individuals managing body composition — a range that translates to roughly 0.7–0.9 grams per pound. On a GLP-1 medication where appetite is significantly suppressed, hitting this target intentionally — through protein-dense foods and, when needed, a quality protein supplement — is one of the most impactful things you can do to protect muscle.

Yes — exercise science research consistently shows that resistance training is the most effective behavioral intervention for lean mass preservation during calorie-restricted weight loss. Compound movements (squats, presses, rows, hinges) performed 2–3 times per week are sufficient to meaningfully reduce the proportion of weight lost that comes from muscle. Even minimal resistance training appears to shift body composition outcomes compared to cardio-only or sedentary approaches during GLP-1 treatment.

The gold standard is a DEXA (dual-energy X-ray absorptiometry) scan, which provides precise measurements of fat mass, lean mass, and bone density. For practical ongoing tracking, a combination of a body composition scale, regular waist and hip circumference measurements, and progress photos every 2–4 weeks gives actionable data. The key is establishing a baseline early in your journey — before significant weight loss — so you have a reference point for understanding what you're gaining and losing over time.

How are you currently tracking your progress beyond just the scale — and what's surprised you most about what you've found?

Here are a few to get you started — but don't let these limit you:

Or maybe it's something completely different. Hit reply and tell me — I read every single response, and the best answers get featured in next week's issue (with your permission, of course).

Your experience might be exactly what someone else needs to hear right now. 💪

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📆 See you next week! — The Weekly Dose Team

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