Most women on a GLP-1 should aim for 1.2 to 1.6 grams of protein per kilogram of body weight per day, split into meals of roughly 30 to 40 grams each. For a 163-pound woman, that works out to about 90 to 120 grams daily. Protein at that level, paired with strength training, is what protects muscle while the medication is quieting your appetite.

GLP-1s work. I’m not here to debate that.

What I am here to talk about is what came off. When researchers ran DXA scans on a subgroup of people losing weight on semaglutide in the STEP 1 trial, the split was 60% fat mass and 40% lean mass. Roughly 10.4 kilograms of fat, and 6.9 kilograms of lean tissue. Muscle, bone, the whole structure holding your metabolism up.

That’s the part nobody mentions when they tell you the scale is moving.

Why Protein Matters More on a GLP-1 Than It Did Before

The medication does what it says it does. It slows gastric emptying, it quiets the food noise, and for a lot of women it’s the first thing that ever made eating less feel possible instead of a daily fight. That part is real.

But appetite suppression doesn’t change what your body needs. It changes what you feel like eating. Intake drops by hundreds of calories a day and protein is the first thing to go, because it’s the most filling macro and the least appealing when your stomach feels full at 11am.

In 2025, four organizations, the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society, published a joint advisory on nutrition during GLP-1 therapy. Eight priorities. Number six was adequate protein intake paired with strength training to preserve lean mass. Not a footnote. A named priority from four national bodies at once.

And this matters more if you’re in your forties. The average woman who fills out my new client assessment is 43 years old and starting at 163 pounds, and I’ve now got 5,621 of those forms sitting in a spreadsheet. Perimenopause is already pulling estrogen down, which makes muscle harder to hold onto on its own. Add a medication that sharply cuts how much you eat and you have two forces working on the same tissue at the same time.

Your Actual Protein Goal on a GLP-1

Okay, the number.

A clinical review of GLP-1 optimization puts the target above 1.2 grams of protein per kilogram of body weight per day, spread evenly across meals, alongside structured resistance training. The 2025 joint advisory lands in the same neighborhood, with higher targets in the range of 1.2 to 1.6 g/kg for people actively losing weight.

In pounds, because that’s how most of us think:

• 150 pounds → about 82 to 109 grams a day
• 163 pounds → about 89 to 118 grams a day
• 180 pounds → about 98 to 131 grams a day
• 200 pounds → about 109 to 145 grams a day
• 220 pounds → about 120 to 160 grams a day

Start at the bottom of your range and work up. If you are strength training two or three times a week, which you should be, aim closer to the top.

Those are population ranges from the literature, not your number. Your target shifts with your height, your lean mass, your training load, and your thyroid, which is where a custom macro calculation earns its keep. Talk to the doctor who wrote your prescription before you treat a blog post as the final word.

The medication buys you a window of quiet appetite. Protein and muscle are what you build inside it.

Spreading It Across the Day Matters as Much as the Total

Most women on a GLP-1 eat almost nothing until dinner because nothing sounds good, then get 70 grams of protein in one sitting and call it a win.

Same total. Different result.

Researchers gave 15 women, average age 37, the same 90 grams of protein a day for a week in two different patterns. One week it was 10 grams at breakfast, 20 at lunch, 60 at dinner, which is more or less how Americans eat. The other week it was 30, 30, and 30. The balanced pattern produced greater 24-hour net muscle protein synthesis. Identical protein, better outcome, purely from the spacing.

The mechanism is a threshold. Each meal has to clear roughly 30 grams of quality protein to fully switch on muscle protein synthesis, and that threshold climbs with age. A 12-gram breakfast counts toward your daily total and does close to nothing for your muscle.

Listen, a breakfast of 2 eggs is NOT a high protein breakfast. It’s 12 grams. That’s true whether or not you’re on a medication, and on a GLP-1 it’s worse, because you may not get a real second chance at lunch.

How to Hit Your Protein When You Have No Appetite

The problem on a GLP-1 is rarely knowing what to eat. It’s volume. You can’t chew your way to 110 grams when you’re full after six bites.

When solid food feels heavy:

• Liquid protein at breakfast, before appetite disappears for the day. Greek yogurt blended with protein powder and berries goes down when a plate of eggs won’t.
• Cottage cheese, which is dense enough that half a cup gets you around 14 grams without much volume.
• Bone broth or a protein shake as a bridge between meals rather than a replacement for one.

Front-load the day. Your best window is the morning, before the fullness settles in, and the women who wait to see if appetite shows up later are the ones who end the day 40 grams short.

When you’re just not hungry at all:

• Eat on a schedule instead of on hunger cues, because hunger is no longer giving you accurate information.
• Keep three repeatable meals in rotation so you’re never deciding, only reheating.
• Batch cook protein on Sunday. Rotisserie chicken, a pound of ground turkey, a tray of egg cups.

Long fasting windows are the wrong tool here. When appetite is already suppressed, adding hours of not eating on top makes the protein target close to impossible.

Getting Started: Four Things That Move the Needle

If you do nothing else this week, do these.

Weigh yourself and do the math once. Multiply your weight in pounds by 0.55 for the bottom of your range and 0.73 for the top. Write both numbers down somewhere you’ll see them.

Build the breakfast first. Get one protein-forward breakfast to 30 grams and make it automatic before you touch the rest of the day. It’s the meal with the most room on a GLP-1 and the one most women skip.

Add strength training two to three days a week. Protein without resistance training is half the intervention. Full body, squat and hinge and push and pull, and 30 minutes is plenty.

Get a baseline body composition scan. An InBody or DEXA now, then again in 12 to 16 weeks, tells you whether you’re losing fat or losing muscle. Your bathroom scale cannot, and on a GLP-1 that distinction is the whole game.

My client Diane Black had been training five to six days a week for nine straight years when she came to me. Strength, HIIT, cardio, all of it. She had almost no visible muscle definition to show for it, plus hypothyroidism, Hashimoto’s, PCOS, and perimenopause. She wasn’t training wrong. Nine inches came off in six weeks once the nutrition matched the effort, three of them from her waist.

Katie Smith came in at 46 eating 1,200 calories or less, chronically exhausted, carrying 35 pounds she’d put on over four years. She’d worked with a nutritionist through insurance for a full year and gained five. The fix was eating more, on purpose, with structure.

Neither woman was on a GLP-1. The pattern is the one I see in women who are, which is under-fueling a body that needs building material.

Ready to Build the Habits Before the Medication Wears Off?

I put everything I know about eating, training, and transitioning off a GLP-1 into a free guide, including the daily checklist, the recipes my clients use, and what the research says about coming off.

Grab my free GLP-1 Guide!

And when you want your own protein number instead of a range, plus the workouts and the coaching to go with it, that’s what my nutrition & fitness coaching program is built for.

xo, Loren