The Protein Number Nobody Agrees On

I'm a carnivore at heart. I'm married to a man who has a degree in meat. We take protein very seriously in our house, but things are getting a little out of hand in the protein maxxing realm of the social media universe. Let's take a quick look at the research and see just how much protein you should actually be getting each day. Two groups of my patients get told the same thing constantly: eat more protein. GLP-1 patients hear it because muscle loss during rapid weight loss is real. Perimenopausal women hear it because social media has decided the answer to almost every midlife symptom is more protein and more strength training. Both groups deserve a real answer, not a round number pulled from an influencer's post, so here is what the actual research supports for each.

Let's start with GLP-1 patients, since this is the more settled of the two. A recent multi-society clinical advisory on GLP-1 therapy, authored by obesity medicine physicians and researchers, recommends 1.2 to 1.6 grams of protein per kilogram of body weight daily during active weight loss, or a simpler absolute target of 80 to 120 grams a day for most adults. This matters because appetite suppression this effective can lead to real muscle loss alongside fat loss, and protein intake at this level, combined with resistance training at least three times a week, is what the evidence actually supports for preserving muscle while losing weight quickly. Protein alone will not do the job. The advisory is explicit that resistance training is not optional if muscle preservation is the goal. It's literally use it or lose it when it comes to your muscles.

Eighty to 120 grams sounds abstract until you put it next to actual food. A six-ounce chicken breast gets you around 50 grams. Three eggs add another 18. A cup of Greek yogurt contributes about 20, and a scoop of protein powder in a shake adds another 25 or so. Stack a protein-forward breakfast, a chicken or fish based lunch, and a dinner built around meat, fish, or tofu, and 100 grams a day is genuinely achievable without supplements doing all the work. The harder part on a GLP-1 medication is not the math. Appetite suppression means you may only have room for small portions at each sitting, which makes protein-dense choices, not just protein-sized ones, the real strategy. A few bites of chicken accomplishes more than a large serving of pasta ever will.

Perimenopausal and menopausal protein needs are a different, messier story, and it is worth being honest about that instead of repeating a number because it sounds confident.

Real muscle loss during this transition is documented. A 2026 narrative review in the Journal of Cachexia, Sarcopenia and Muscle found lean muscle mass drops by roughly 2.5 percent in perimenopausal women and 5.7 percent in postmenopausal women compared to premenopausal women. That is a real, measurable change tied to declining estrogen.

Where things get murkier is exactly how much protein is needed to counteract it. You have likely seen the claim that women in perimenopause need 2 to 2.3 grams of protein per kilogram daily, nearly triple the standard recommended intake. That figure traces back largely to the work and public commentary of one well known exercise physiologist, not a body of randomized controlled trials specific to this life stage. The same claim is often paired with the assertion that muscle protein synthesis drops by up to 40 percent in older women after eating, which is where this gets genuinely interesting. That 2026 review found the opposite in several of the studies it examined, muscle protein synthesis was actually elevated, not reduced, in older women compared to younger women in some research. The evidence underlying the most repeated number in this space is far less settled than the confidence around it suggests.

What does hold up reasonably well is more modest. The PROT-AGE expert group, a body that reviews protein needs across the aging population generally, recommends 1.0 to 1.2 grams per kilogram daily for older adults to maintain muscle mass, well above the standard 0.8 gram RDA but far short of the more dramatic numbers circulating online. A controlled trial of women aged 60 to 75 with sarcopenia found that 1.2 grams per kilogram daily preserved and improved muscle mass and strength over twelve weeks significantly better than the standard 0.8 gram RDA did. That is real evidence, and it points to a target in the 1.0 to 1.6 gram range as reasonably well supported, not 2 or more.

A formal review focused specifically on postmenopausal women summed up the state of the science bluntly: the evidence is limited and not high quality enough to make strong, specific recommendations, though what exists suggests protein intake at least at the RDA, and likely somewhat above it, supports better outcomes than staying at the bare minimum.

Put plainly, if you are perimenopausal or postmenopausal and not on a GLP-1 medication, targeting somewhere in the 1.0 to 1.6 gram per kilogram range, spread across meals rather than loaded into one, is a reasonable, evidence-supported goal. Chasing 2 or more grams per kilogram is not clearly harmful for most healthy people, but it is also not something the current research firmly supports over the more moderate target, whatever your feed is telling you.

The one piece of advice that holds steady across every version of this research, for GLP-1 patients and perimenopausal women alike, is that protein without resistance training accomplishes far less than protein paired with it. If you are only changing one variable, strength training two to three times a week will likely move the needle more than pushing your protein target higher.

If you want a number tailored to your actual body composition rather than a guess, that is exactly what body composition testing is for, and it is something we can build into your visit rather than estimating from a formula alone.

TL:DR on the Study

Link to the study: https://pmc.ncbi.nlm.nih.gov/articles/PMC12104658/

The basics: Higher protein intake may better preserve muscle mass in older women with sarcopenia than the standard recommended daily allowance.

Who was in the study: 126 women aged 60 to 75 with sarcopenia, divided into two equal groups.

What they did: One group consumed the standard RDA of 0.8 grams of protein per kilogram of body weight daily, the other consumed a moderately higher 1.2 grams per kilogram daily, for 12 weeks.

The results: The higher protein group showed significant improvements in muscle mass, strength, and body composition, including reduced waist circumference and fat mass, compared to the standard RDA group.

Why it matters: This is real controlled trial evidence that moderately increasing protein intake above the standard RDA meaningfully benefits older women, without needing to reach the much higher numbers often promoted online.

The catch: The study ran 12 weeks, so it doesn't tell us what happens over years, and it studied women already diagnosed with sarcopenia, not the general perimenopausal population.

How it works (probably): Extra dietary protein provides more amino acid building blocks for muscle repair and growth, and older muscle appears to need a larger protein stimulus to trigger that repair process than younger muscle does.

Learn more about physician-guided nutrition and body composition testing at www.presencemd.net.