The number nobody gives you a straight answer on

Ask how much protein you need on a GLP-1 and you'll get a shrug dressed up as advice. "Get enough." "Prioritize protein." "Aim high." All true, all useless when you're standing in the kitchen with a half-eaten chicken breast and an appetite that vanished three weeks ago.

The problem is that the famous number — the 0.8 grams per kilogram you might half-remember — was never meant to answer the question you're actually asking. It's a floor, not a goal. And on a GLP-1, building your day around a floor is how you lose the wrong kind of weight.

Let's fix the number.

Why the RDA is the wrong starting point

The official Recommended Dietary Allowance for protein, roughly 0.8 g per kilogram of body weight, is defined as the amount needed to keep a sedentary adult from going into deficiency — the point below which most people start losing nitrogen, a rough proxy for breaking down tissue. It answers "how little can I get away with," not "how much helps me thrive."

Two things about your situation make that floor especially poor guidance.

First, you're in an energy deficit, often a steep one. When you eat fewer calories than you burn, your body becomes more willing to break down muscle for fuel and amino acids. Higher protein intake partially offsets that — a well-documented effect sometimes called protein-sparing. The deeper the deficit, the more protein you need just to hold position.

Second, GLP-1 medications blunt appetite so effectively that total intake drops without you deciding to diet harder. Protein is usually the first casualty, because meat and other dense protein sources are filling and sometimes unappealing when nausea is in the picture. So the deficit gets steeper and the protein gets scarcer at the same time. That's the exact combination that costs you lean mass.

A target you can actually use

Research on athletes and dieters in a calorie deficit — much of it from groups like Stuart Phillips's lab and reviewed extensively by sports nutrition researchers — converges on a range well above the RDA. For active people trying to preserve muscle while losing fat, intakes in the neighborhood of 1.6 to 2.4 grams per kilogram of body weight per day repeatedly come out ahead. The steeper your deficit and the leaner you already are, the higher in that range you want to be.

But there's a catch for many GLP-1 users: body-weight math overshoots if you're carrying a lot of fat, because fat tissue doesn't need feeding the way muscle does. The cleaner fix is to anchor the target to your goal body weight rather than your current one.

A practical translation that holds up well:

Aim for roughly 0.7 to 1 gram of protein per pound of your goal body weight per day.

If your goal weight is 160 pounds, that's about 110 to 160 grams a day. Start at the lower end of the range, and push toward the upper end if you're lifting, if your deficit is aggressive, or if you're older — protein needs rise with age because aging muscle responds more sluggishly to each meal, a phenomenon called anabolic resistance.

If you prefer metric and a lean-tissue anchor, 1.6 g per kg of goal weight lands in the same place. You don't need to be precise to the gram. You need to stop accidentally eating half of what you should.

Why more protein does double duty here

The muscle argument is the headline, but protein earns its place on a GLP-1 in two quieter ways.

It's the most filling macronutrient and the hardest to overeat — which sounds irrelevant when you already have no appetite, until you realize the flip side: protein also has the highest thermic effect, meaning your body spends more energy digesting it than it does digesting fat or carbohydrate. Roughly 20 to 30 percent of protein's calories are burned just processing it. In a deficit, that's a small but free tailwind.

There's also the protein leverage idea, developed by researchers Stephen Simpson and David Raubenheimer: humans appear to keep eating until a protein need is met, and diets low in protein can drive overeating of everything else to get there. A GLP-1 caps how much you'll eat at all. If the limited food you do eat is protein-poor, you may be quietly under-meeting the one need your appetite was trying hardest to satisfy — without the hunger signal that would normally correct it.

Spreading it out matters more than you'd think

Hitting your daily total is the main thing. But once you're in range, distribution becomes the next lever. Your body can only use so much protein to build muscle at one sitting; muscle protein synthesis responds to a meal and then plateaus, regardless of how much more you pile on.

That argues for spreading protein across the day rather than backloading it all into dinner — which is exactly the trap GLP-1 users fall into, skipping a queasy breakfast and a small lunch, then trying to make it up at night when there's no appetite left to make it up with. Three meals of 30 to 40 grams each does more for muscle than one heroic 100-gram dinner, and it's easier on a stomach that empties slowly.

How to actually hit the number when food repels you

A target is only useful if it survives contact with a suppressed appetite. A few things that help:

Front-load the day. Appetite and nausea are often mildest in the morning. Get a real protein dose in early, before the day's window of tolerance closes.

Drink some of it. A whey or soy shake delivers 25 to 30 grams in a volume your stomach barely registers. Liquids are your friend when chewing through a chicken breast feels like a chore.

Anchor every eating occasion to protein first. Eat the protein on the plate before the carbs and vegetables. With limited stomach capacity, whatever you eat first is what actually gets in.

Count it for a week, then stop guessing. Most people are stunned by how far short they fall when they finally tally it. You don't need to track forever — just long enough to recalibrate your sense of what a real protein day looks like.

The number is a floor for muscle, not a ceiling

Here's the reframe worth keeping: on a GLP-1, your appetite is no longer a reliable guide to whether you've eaten enough of the thing that protects your strength. The hunger that used to nudge you toward food has been turned down on purpose. That's the medication working — and it's also why protein has to become a deliberate target instead of an instinct.

So pick your goal weight, multiply by 0.7 to 1, and treat that number of grams as non-negotiable, the way you treat the medication itself. The scale will move either way. Whether what's left underneath is muscle or not depends largely on this one number.

This is the part that's easy to lose track of day to day, which is exactly why we built Lean — a GLP-1 companion that turns this protein target into something you actually hit, anchored to your goal weight, tracked alongside your lifts so you can see muscle being protected rather than hope it is. If you'd rather not do the arithmetic in your head every morning, Lean will carry it for you.