GLP-1 Master Trainer Keep the Muscle
For people on Ozempic, Wegovy, Mounjaro, Zepbound & other GLP-1s

The medication takes the fat. You decide what happens to the muscle.

Muscle retention on a GLP-1 — Ozempic and Wegovy (semaglutide), Mounjaro and Zepbound (tirzepatide).

In GLP-1 trials, up to 30–40% of the weight people lose is lean mass. Not because the drug attacks muscle — because appetite collapses and they stop eating enough to keep it. That part is fixable.

0.5–1% weekly loss cap, enforced 0 protein-first recipes 0 foods priced by protein

Your weekly loss rate

Live check
—%
enter your numbers
The green band is where muscle is most protected.
How it works

Muscle stays when synthesis outpaces breakdown. Everything here serves that one equation.

A GLP-1 is very good at creating a deficit. That shifts your risk from overeating to under-eating protein, under-training, and losing weight too fast. These are the three levers that decide whether the loss comes from fat or from you.

LEVER 01

Pace the loss

Past roughly 1% of body weight a week, amino acid oxidation climbs and the body starts pulling from contractile tissue. Every plan here is capped at 0.5–1%.

LEVER 02

Feed the signal

In a deficit, protein gets diverted to making glucose. You have to overshoot baseline — spread across the day, in doses big enough to trigger synthesis each time.

LEVER 03

Keep the load heavy

Mechanical tension is the message that says this muscle is still load-bearing, don't recycle it. Lighten the weight and you've sent the opposite one.

Build my plan

Tell us who we're building for.

A few answers set your safe weekly pace, your daily and per-meal protein targets, and which recipes we show you. Everything stays in your browser.

1 You
2 Food
3 Body scan

Your numbers

These set your safe pace and your protein target.

How you like to eat

We'll only show recipes that fit. Tap all that apply.

DEXA scan (optional)

Lean mass is the best basis for a protein target — it's the tissue you're actually defending. No scan? Skip it; we'll anchor to your goal weight instead.

I have body-composition numbers to enter
From a DEXA, InBody, or BodPod scan.
Your muscle-safe loss range
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Est. time to goal at this pace
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Daily protein target
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Weekly loss cap
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A ceiling, not a target. Above this, more of what you lose is muscle.
Total to lose
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Leucine per meal
2.5–3.0 g
The switch that turns protein synthesis on. Hit the gram target but miss this and the meal barely registers — which is how plant-heavy days quietly fail.
Daily water
3.5–4.5 L
Dehydrated muscle cells shrink, and cell shrinkage itself downregulates protein synthesis.
Creatine monohydrate
3–5 g / day
Don't cycle off in a deficit. It's what keeps your top-end power — and your training stimulus — intact.
Sleep
7–9 hrs
Restriction drops testosterone and growth hormone while raising nocturnal cortisol. It's a catabolic setting.

Your protein, spread across the day

Weigh-in tracker

The cap only works if something is watching it.

Log your weight once a week, same day, same conditions. We calculate your rolling rate as a percentage of body weight — and tell you the moment you break through 1% a week, which is where the loss starts coming out of muscle.

Add a weigh-in

Morning, after the bathroom, before eating. Consistency matters more than precision.

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No data yet

Log two weigh-ins at least five days apart and your rolling rate appears here, along with an alert if you cross the cap.

Latest week
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vs previous weigh-in
Rolling 28-day
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the number that matters
Total change
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since first weigh-in

Weekly rate against the cap

Each bar is one weigh-in interval, expressed as % of body weight lost per week. The green band is the target zone.

In the 0.5–1% band Under 0.5% — room to eat more Over 1% — muscle at risk

Your log

Every entry, with the rate it produced.

Recipes

Small plates. Serious protein.

Built for a suppressed appetite: high protein per bite, leucine-rich sources, and gentle on a stomach that's emptying slowly. Tap any card for the full ingredients and method. Anything you flagged as an allergy is filtered out automatically.

MEAL
STYLE
Scale portions to
Goal weight (lb)
1.00×
portion multiplier
Training

Heavy enough to matter. Short enough to recover from.

The instinct in a deficit is to drop the weight and chase reps. That's exactly backwards. Keep the load heavy — that's the signal — and cut the volume instead, because a deficit is where your capacity to recover, not your capacity to lift, falls off.

Intensity — hold it
6–12 reps @ 75–85%

Same loading zone you'd use to build. Mechanical tension is the message. Light weight for "toning" tells the body the muscle isn't needed.

Volume — cut it
−20% to −33% sets

Recovery is what's scarce, not effort. Sets beyond what you can recover from become junk volume that raises fatigue and costs you tissue.

Effort — cap it
1–3 RIR

Leave reps in reserve. Training to failure on low calories spikes cortisol and wrecks the next session, which is the one that mattered.

DAY A

Push & hinge

Do the heaviest compound first, while the nervous system is fresh. Control the lowering phase for 2–4 seconds on every primary lift.

  • ▪ Goblet or barbell squat 3 × 6–10
  • ▪ Chest press (bench, dumbbell, or push-up) 3 × 8–12
  • ▪ Romanian deadlift 3 × 8–10
  • ▪ Overhead press 2 × 8–12
  • ▪ Plank or dead bug 3 × 30s
DAY B

Pull & carry

Backside strength and grip — the tissue a scale never shows but a mirror does. Same eccentric discipline applies.

  • ▪ Row (dumbbell, cable, or TRX) 3 × 8–12
  • ▪ Split squat or step-up 3 × 8 each
  • ▪ Lat pulldown or assisted pull-up 3 × 6–10
  • ▪ Hip thrust 3 × 10–12
  • ▪ Farmer carry 3 × 30s
Deload every 4–6 weeks — before you need it. In a deficit, joint and neurological fatigue accumulate faster than they clear. Don't wait for the performance crash: cut volume by 50% and intensity by 10–15% for a week, let inflammation settle, then resume. A scheduled deload is cheap. An injury on low calories is not.
Walk, don't sprint — and here's the actual mechanism. Hard endurance work activates AMPK, which directly inhibits mTORC1 — the exact pathway resistance training uses to hold onto muscle. The two signals fight each other; this is the interference effect (Wilson et al., 2012). Low-intensity cardio and daily steps don't generate enough localised muscular fatigue to trigger it, which makes them the better tool for burning energy while defending tissue. On a GLP-1 you already have the deficit you need. Walk.
Your strength log is the real body-composition test. The scale can't tell you what you lost. If your primary lifts drop sharply and stay down, that's a lagging signal you're spending contractile tissue — not water, not glycogen. Ease the deficit before you lose more.
Build my program

A program written to the rules — not to whatever's popular.

Tell us what you have to work with. Every program that comes out obeys the same constraints: heavy loading held at 75–85%, volume cut for a deficit, 1–3 reps in reserve, controlled eccentrics, and a deload every 4–6 weeks. Those aren't suggestions we pass along — they're hard-coded, and nothing gets generated that breaks them. Tell us about an injury or a time limit and the exercises change accordingly.

Strength log

The scale tells you that you lost. This tells you what.

Strength retention is the best proxy you have for muscle retention. A weight drop with your lifts holding is fat coming off. A weight drop with your lifts collapsing is muscle — and it's a lagging signal, so by the time you see it, it's been happening a while. Log your top set weekly.

Log a lift

Your heaviest working set — weight and reps. Same lift, same conditions, once a week.

Estimated 1RM uses the Epley formula — it lets you compare a heavy triple against a lighter set of ten on the same scale.

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No lifts logged

Log the same lift across a few weeks and we'll track your estimated 1RM — and tell you if strength is falling faster than a normal fluctuation.

Estimated 1RM over time

Flat or rising while your weight falls is exactly what you want. A sustained decline is the warning.

The protocol

Twenty strategies for keeping muscle in a deficit — translated for a GLP-1.

Most muscle-retention advice was written for lean athletes preparing for competition. The physiology still holds on a GLP-1, but the practicality doesn't always. Each strategy carries a note on what changes when a medication is doing the appetite work for you.

FILTER
Meal builder

Not a recipe. A formula.

Most protein meals are the same two decisions: pick a protein, pick what you pair it with. Do it here and we'll flag what the recipe books don't — when a plant protein needs a leucine chaser to actually work, and when a fiber will sit in a stomach a GLP-1 has already slowed to a crawl.

The trap in most "cheap bulking" advice. It optimises for cheap calories, not cheap protein — and those point in opposite directions. 73/27 ground beef is celebrated as a budget staple, but 3 oz gives you about 17g of protein for 230 calories. Canned tuna gives you 26g for 110. On a GLP-1 you have a hard ceiling on how much you can physically eat, so every calorie spent on cheap fat is a calorie not spent on protein you actually need. Budget mode sorts by cost per 30g of protein — the only number that matters when money and appetite are both tight.

1 · Protein base

Sorted by what fits this meal. Your allergies and diet already filter this list.

2 · Pairing

This is the half that does the physiological work.

Questions people actually ask

Straight answers about muscle and GLP-1s.

The questions that bring people here, answered without hedging. If the honest answer is "it depends" or "we don't know yet," it says so.

Does Ozempic make you lose muscle?

Not directly. Ozempic (semaglutide) and the other GLP-1 receptor agonists are not catabolic — they don't attack muscle tissue. What they do is suppress appetite so effectively that most people fall below their protein minimum and lose the energy to train hard. The muscle loss is a consequence of under-eating, not a side effect of the drug itself. That distinction matters enormously, because it means the problem responds to protein and resistance training.

How much muscle do you lose on a GLP-1?

Clinical trials commonly report that 30–40% of total weight lost on a GLP-1 comes from lean mass rather than fat. For context, roughly 25% lean-mass loss is typical in any weight loss, even without medication, and some of what a DEXA scan reads as 'lean' is water and glycogen rather than contractile tissue. So the GLP-1 figure is meaningfully elevated — but it is not catastrophic, and it is not inevitable.

How do I keep muscle while on Ozempic, Wegovy, Mounjaro, or Zepbound?

Three levers, in order of importance. First, cap the pace: keep weekly weight loss between 0.5% and 1% of body weight — faster than that and the body starts spending muscle. Second, hit your protein: roughly 2.0–2.4g per kg of your goal weight (not your current weight), split across 3–5 feedings of 30–40g each. Third, keep lifting heavy: hold your loads at 75–85% of your one-rep max and cut training volume by about 25%, rather than dropping the weight and chasing higher reps.

How much protein should I eat on a GLP-1?

About 2.0–2.4 grams per kilogram of your GOAL body weight, not your current weight. Anchoring to total bodyweight overshoots badly if you're carrying significant fat mass, because fat tissue doesn't need feeding. For most people this lands between 120g and 180g per day. Just as important as the daily total is the per-meal dose: each feeding needs 30–40g of protein and roughly 2.5–3.0g of leucine to actually trigger muscle protein synthesis.

Can you build muscle while on a GLP-1?

It's possible but difficult, and for most people it is the wrong goal. In a calorie deficit, the realistic and correct objective is to RETAIN the muscle you already have while losing fat. Untrained beginners and people returning to lifting after a long break can sometimes gain a little muscle in a deficit, but if you are experienced, expect to hold rather than grow — and treat holding as a win, because most people on these medications are losing it.

Should I lift weights while taking a GLP-1?

Yes, and it is the single most effective thing you can do. Resistance training is the signal that tells your body the muscle is still needed. Without that signal, muscle is metabolically expensive tissue that the body will happily dismantle for energy. Two to three sessions a week of heavy compound lifting is enough. Cardio does not substitute for this — and excessive high-intensity cardio can actively work against it.

How fast should I lose weight on a GLP-1?

0.5% to 1% of your body weight per week. At 250 lb, that's about 1.25 to 2.5 lb a week. Consistently exceeding 1% per week is the clearest warning sign that you are burning through muscle as well as fat. If you're losing faster than that, you are almost certainly under-eating — eat more protein, not less food overall.

Do you gain the weight back after stopping a GLP-1?

Most people regain a substantial portion, and this is exactly why muscle retention matters. Muscle is metabolically active tissue — it is a large part of what determines your resting energy expenditure. If you lose 40 lb and 15 lb of it was muscle, you come off the medication with a slower metabolism than you started with, which makes regain faster and harder to reverse. The muscle you keep is the thing that protects you afterwards.

Why do I lose muscle when I'm barely eating on a GLP-1?

That IS the mechanism. When protein intake falls below what's needed to maintain tissue, the body breaks down muscle to supply amino acids for essential functions. A suppressed appetite makes it very easy to fall into a severe protein deficit without noticing, because you don't feel hungry. The absence of hunger is not evidence that you're eating enough.

What is the leucine threshold and why does it matter?

Leucine is the amino acid that switches on muscle protein synthesis via the mTORC1 pathway. Research indicates you need roughly 2.5–3.0g of leucine in a single meal to fully trigger that switch. This is why protein timing and per-meal dosing matter, not just the daily total — and it's why plant proteins often need a free-form leucine supplement, since they can hit the gram target while still falling short of the leucine needed to register.

What is the cheapest high-protein food?

By cost per 30g of protein, bulk whey protein concentrate is the best overall value at roughly $0.50, and it's protein-dense and complete. Canned mackerel (~$0.67), chicken leg quarters (~$0.68), and canned pink salmon (~$0.83) are the best whole-food options. Dried beans are cheaper still (~$0.39) but a poor choice on a GLP-1, because they deliver only about 6.5g of protein per 100 calories — you'd have to eat 460 calories of them to get one 30g feeding, which is not realistic when your appetite is suppressed.

Is muscle loss on Ozempic permanent?

No. Muscle lost during weight loss can be rebuilt with resistance training and adequate protein, though rebuilding is slower and harder than retaining in the first place. The much better strategy is to prevent the loss while it's happening rather than to try to reverse it afterwards. If you have already lost significant muscle, the same three levers still apply — slow the pace, raise the protein, lift heavy.

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of GLP-1 weight loss can be lean mass
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weekly loss ceiling before muscle goes
0g
of leucine per meal to flip the switch
$0
cheapest complete protein, per 30g
Protein per dollar

The 50 best protein sources, ranked by what they actually cost you.

These medications run hundreds of dollars a month, and then someone tells you to eat 150g of protein a day. That's a budget problem before it's a discipline problem. So here is every major protein source, priced by cost per 30g of protein — one feeding — rather than cost per pound.

Cheap isn't the same as good

Every food below, plotted by price (left is cheaper) against protein density (higher is better). You want the top-left.

Why the cheapest food on the list is a trap

Dried black beans are the cheapest protein you can buy — $0.39 per 30g. They're also a poor choice for you, and the reason is the thing that makes your situation different from everyone else's.

Beans carry only 6.5g of protein per 100 calories. To get one 30g feeding you'd eat roughly 460 calories of them. A normal dieter can do that. You have a medication suppressing your appetite — stomach space is your scarcest resource, not money.

What you actually want: cheap AND protein-dense AND leucine-complete. Bulk whey concentrate hits all three — $0.50 per 30g, 23g of protein per 100 calories, complete amino profile. Canned mackerel, canned tuna, chicken leg quarters and frozen white fish are the whole-food versions.
What to be careful of: peanut butter looks cheap at $0.80 per 30g, but delivers just 4.2g of protein per 100 calories. It's a superb fat anchor and a terrible way to hit a protein target. Same for oats, quinoa and hemp hearts — they're carbs and fats with a protein rumour attached.
SORT BY
Food $ / 30g protein Protein per 100 kcal Leucine

On the numbers. Prices are US national averages for mid-2026 — eggs and chicken breast are anchored to the Bureau of Labor Statistics May 2026 series ($2.19/dozen and $4.17/lb respectively); the rest are typical supermarket and bulk-supplier estimates. They will drift, and they vary a lot by region and by store. The ranking is far more stable than the absolute figures: lentils will always beat scallops. Treat this as a map, not a receipt — and check your own shelf.

The evidence

Where these numbers actually come from.

Every target on this site traces to published research, not to gym folklore. Here are the studies doing the work, and what each one is actually claiming — including where the picture is more complicated than a headline.

01

The 30–40% figure

Clinical trials of GLP-1 receptor agonists have found that a large share of total weight lost — commonly cited in the 30–40% range — comes from lean mass rather than fat.

What it actually means: the drug is not catabolic. It doesn't attack muscle. What it does is suppress appetite so effectively that people fall below their protein minimum and lose the glycogen they'd need to train hard. The lean mass loss is a consequence of under-eating, which is why it responds to protein and resistance training.

The honest caveat: some lean-mass loss accompanies any weight loss — roughly 25% is typical even without medication, and part of what a DEXA reads as "lean" is water and glycogen, not contractile tissue. The GLP-1 number is meaningfully elevated, not catastrophic. It's a reason to act, not to panic.
02

The leucine threshold

Muscle protein synthesis runs through the mTORC1 pathway, and leucine is the amino acid that flips the switch. The working target is 2.5–3.0g of leucine per meal — below that, a meal barely registers.

Source: Phillips & van Loon (2011). This is why the site spreads protein across 3–5 feedings instead of chasing a daily total, and why plant-heavy meals get a free-form leucine chaser — plant protein can hit the gram target and still miss the signal.
03

Pre-bed casein

30–40g of slow-digesting protein about 30 minutes before sleep measurably raises overnight muscle protein synthesis, covering the long catabolic window of a night's fast.

Source: Trommelen & van Loon (2016). This is the entire reason the Pre-bed category exists — and why, on a GLP-1, it's the meal most worth defending even when nothing else will go down.
04

The interference effect

High-intensity endurance work activates AMPK, which directly inhibits mTORC1 — the same pathway resistance training uses to build and hold tissue. The two signals fight each other.

Source: Wilson et al. (2012), meta-analysis. This is the mechanism behind "walk, don't sprint." Low-intensity cardio and daily steps don't generate enough localised muscular fatigue to trigger the interference, which makes them the better tool for burning energy while you're trying to keep muscle.
05

Diet breaks

Alternating two weeks of restriction with two weeks at maintenance produced greater fat loss and better retention of fat-free mass than continuous dieting.

Source: the MATADOR study, Byrne et al. (2018). Real evidence, and stronger than I'd have guessed.
But on a GLP-1 this is a clinical conversation. MATADOR studied unmedicated dieters. Eating back to maintenance while on an appetite-suppressing drug may mean adjusting your dose — that's a decision for your prescriber, not a website.
06

Pace, volume, and effort

The three settings this site enforces: loss capped at 0.5–1% of body weight per week, training volume cut by roughly 25% in a deficit, and working sets kept at 1–3 reps in reserve.

Why together: intensity is the signal that muscle is still needed, so load stays heavy. Recovery is what's scarce in a deficit, so volume comes down. And training to failure on low calories spikes cortisol and costs you the next session — which was the one that mattered.
What we left out, on purpose. A lot of physique-world nutrition writing is fluent, confident, and quietly made up. Claims we were offered and declined to publish: that celery burns more calories than it contains (it doesn't — it's simply low-calorie and watery); that chewing hard foods triggers a histamine satiety pathway; that MCTs "bypass the digestive tract" for instant energy; that specific seed oils meaningfully raise testosterone. Each one is repeated constantly and none of it survives contact with the literature. If a rationale here sounds less exciting than what you've read elsewhere, that's the point.
A note on how to read this. Citations are given so you can go and check them, which is the point of citing anything. Individual studies get overturned; effect sizes shrink under replication; none of this is a substitute for a clinician who knows your labs. If something here conflicts with what your care team tells you, they have information this website does not.
Why slow wins

The scale can drop for two very different reasons.

Body weight is fat plus muscle plus water. A fast drop feels like progress but usually means you're spending tissue you'll want back — and muscle is the tissue that keeps the weight off after the medication stops.

0.5–1% / WEEK FAT MUSCLE Muscle held OVER 1% / WEEK MUSCLE LOST Muscle spent SAME LB LOST

Two people lose the same number of pounds. Only one of them still has the muscle.