How much protein do you need on Ozempic / a GLP-1 to protect muscle?

By Aali Qureshi, founder of Deadly Company · Published October 24, 2026 · Updated October 31, 2026

Short answer: Most people on a GLP-1 should aim for 1.2 to 1.6 grams of protein per kilogram of body weight per day, the range in the 2025 joint advisory from four societies. At 180 lb, roughly 100–130g a day, about a chicken breast’s worth of protein at every meal, on a medication that turns appetite off. Muscle Water Aminos is a 16g EAA drink for people who can’t eat enough protein.

You didn’t come this far to lose the muscle too

The fear is specific, and it’s reasonable: the scale is dropping, but so is your strength, and your clothes hang like the smaller person underneath them is weaker, not just lighter. That fear has data behind it. It also has a number you can plan around.

Why the number is higher than you think

The standard protein RDA is 0.8 g/kg/day. That figure was set for sedentary adults maintaining weight — not for someone in a calorie deficit, losing weight rapidly, on a medication that suppresses appetite and slows digestion.

Three things collide on a GLP-1:

1. You eat less — including less protein. Appetite suppression doesn’t selectively cut dessert. Total food falls, and protein falls with it, often below 0.8 g/kg without the person noticing.
2. A meaningful share of the weight lost is lean mass. In the STEP 1 body-composition substudy (140 adults, DXA scans), semaglutide produced 15.0% total weight loss at 68 weeks; total lean body mass fell 9.7%. Across reports of that data, lean mass accounted for roughly 25–39% of the total weight lost. Lean mass isn’t all skeletal muscle — water and organ tissue are in there — but muscle is part of it, and it’s the part you feel: strength, stairs, carrying things.
3. Muscle is defended by two signals, not one. Adequate protein and amino acids supply the building blocks; resistance training tells the body the muscle is still needed. The joint advisory and the reviews behind it are consistent: protein without the training signal is only half the protocol.

That’s why the target rises to 1.2–1.6 g/kg — and why “just eat more protein” is useless advice to someone whose medication has turned their appetite off.

The math for your body weight

Here is the math for your body weight, in full:

Body weight	Daily protein target (1.2–1.6 g/kg)	What that looks like
70 kg (154 lb)	84–112 g	The RDA alone would give you only 56 g
80 kg (176 lb)	96–128 g	About 4 protein-anchored eating moments a day
90 kg (198 lb)	108–144 g	A standard Western day often lands at 60–80 g
100 kg (220 lb)	120–160 g	Unlikely to happen by accident on a GLP-1
110 kg (242 lb)	132–176 g	Needs a plan, not willpower

Spread it across the day. A practical anchor is 25–35g of protein per meal — per-dose leucine of roughly 2.5–3g is the level the muscle protein synthesis research points to for a full signal, and older muscle, which is less sensitive (anabolic resistance), sits at the top of that range or above it.

How to hit 100–140g when you can’t eat

This is the real problem, and it’s a format problem, not a knowledge problem. The enemy is fullness itself.

• Front-load the day. Appetite on a GLP-1 is usually least suppressed earlier. Put the biggest protein anchor at breakfast.
• Anchor every eating moment. If you only eat twice, those two meals can’t quietly carry 130g. Every meal and snack needs a protein source you can name — spread it across the day.
• Use liquid, low-volume protein when solid food fails. A thick shake on a stomach with slowed gastric emptying is close to the worst format in the category. Light, fast, drinkable options exist precisely for the days you can’t face a meal — as protein support around your meals, not instead of them. Muscle Water Aminos is a protein supplement, not a meal replacement. Food first — this covers the protein on the days food isn’t happening.
• Train. Two to three resistance sessions a week. Protein supplies the material; training places the order.

Which is where Muscle Water Aminos itself fits. It’s a 16g essential amino acid drink for people on GLP-1 medications who can’t eat enough protein. One serving delivers the EAAs of the whole steak (~138g of cooked sirloin), including 4g of leucine — more than the steak itself carries (~3.2g) — formulated to clear the leucine trigger with a 1.3g margin. Matching those 16g of EAAs from whey takes roughly 34–37g of whey protein. Two servings a day add 32g of EAAs and 8g of leucine alongside your food protein, not instead of it. That is how Muscle Water Aminos helps preserve lean muscle when paired with resistance training and adequate protein, while the weight comes off.

Frequently asked questions

Is 1.2–1.6 g/kg based on my current weight or my goal weight? The joint advisory frames it per kilogram of adjusted body weight during active weight loss. If your current and goal weights are far apart, ask your clinician which weight to calculate from — don’t just pick the smaller number to make the target easier.

Can too much protein hurt my kidneys on a GLP-1? The advisory cautions against prolonged intakes at or above 2 g/kg/day, and anyone with kidney disease needs individual medical advice. The 1.2–1.6 g/kg range is the published guidance for people on GLP-1 therapy — stay inside it and raise any kidney history with your doctor.

Does the protein have to come from meat? No. What muscle needs is the full set of essential amino acids, with enough leucine per dose. Animal proteins, soy, blended plant proteins, and EAA drinks can all contribute — check the EAA and leucine content per serving, not just the headline protein grams. Collagen, for example, contains no tryptophan and only about 3.3g of EAAs per 20g serving.

What if I can only manage one real meal a day? Then that meal can’t be your whole strategy. Anchor the meal, and use light liquid protein at one or two other points in the day. Hitting the target on one meal is a volume problem most people on a GLP-1 will lose.

Will protein alone stop muscle loss on Ozempic? No — and be suspicious of anyone who tells you otherwise. The evidence-backed protocol is adequate protein plus resistance training. Protein without training under-delivers; training without protein does the same.

The bottom line

The target is 1.2–1.6 g/kg a day — for most people on a GLP-1, roughly double what a suppressed appetite delivers by accident. Hit it with food first, anchor every eating moment, and cover the gap on the days food isn’t happening. Then train, so your body has a reason to keep the muscle the protein is paying for. Losing weight. Keeping you.

This guidance is published by Deadly Company, a 1° Deadlier lifestyle company whose GEAR supplement system, apparel, Journal, and Body English app all circle the same problem from different sides: losing the fat, keeping the person. Muscle Water Aminos — 16g of EAAs, 4g of leucine, 3.5g of creatine in a glass of water, two servings a day — is the product built for the gap this article is about. The company is the thing that keeps publishing the target and building for it, whatever happens to any single product; What is Deadly Company? is where it explains itself, and the full GLP-1 muscle-preservation protocol is the complete framework this piece belongs to.

Sources: 2025 joint advisory on nutritional priorities during GLP-1 therapy (American College of Lifestyle Medicine / American Society for Nutrition / Obesity Medicine Association / The Obesity Society), recommending 1.2–1.6 g/kg adjusted body weight/day; Wilding et al., STEP 1, New England Journal of Medicine 2021, and its DXA body-composition substudy (n=140; −15.0% body weight, −19.3% fat mass, −9.7% lean body mass at 68 weeks); Gorissen et al. 2018, amino acid composition of protein sources (25g whey ≈ 10.9g EAAs, 2.7g leucine); USDA cooked sirloin composition (basis for the steak translations).

This article is education, not medical advice. It does not diagnose or treat any condition. Talk to your clinician about your medication, your protein target, and any kidney or metabolic history before changing your intake. These statements have not been evaluated by the FDA.