PCW Clarity · Muscle, protein and nutrition
How much protein do I need to keep muscle after 40?
You've heard "eat more protein" everywhere. Here's what the research actually supports, and where it stops.
The short answer
For most midlife women, more than the bare minimum, and it works best paired with strength training. An international expert group, PROT-AGE, recommends that adults over 65 eat at least 1.0 to 1.2 grams of protein per kilogram of body weight per day. It advises 1.2 or more for people who are active, and 1.2 to 1.5 for most people with acute or chronic illness. People with severe kidney disease who aren't on dialysis are the exception and may need less (Bauer 2013). That group studied older adults, not women at 40, so treat it as a reference point, not a prescription.
A large review of strength-training trials found that adding protein helped muscle size and strength, with no further gain in lean mass above about 1.6 grams per kilogram per day (Morton 2018). Your own number depends on your health, especially your kidneys, and should be set with your clinician or a registered dietitian.
Why does this matter?
- Muscle fades faster in the transition. SWAN found lean mass begins to decline at the start of the menopause transition (Greendale 2019).
- Strength is a health marker. The European consensus on sarcopenia, or age-related muscle loss, now uses low strength as the first sign to look for (Cruz-Jentoft 2019). Losing function predicts falls and loss of independence (Bauer 2013).
- Protein alone isn't the whole answer. Protein boosted the gains from strength training, but the extra benefit got smaller with age (Morton 2018). Lifting and eating work together.
- Skipping meals can cost muscle. In a 12-week trial, eating only between noon and 8 PM didn't beat regular meal timing for weight loss, and the time-restricted group lost some lean mass (Lowe 2020). Fewer meals can make it harder to get enough protein.
How do I find a protein target that fits me?
- Start with your kidneys. Ask your clinician whether anything in your labs or history means you should be careful with more protein. PROT-AGE makes an exception for severe kidney disease (Bauer 2013).
- Know your weight in kilograms. Divide pounds by 2.2. The research ranges are per kilogram.
- Look at breakfast first. Many women eat most of their protein at dinner. A dietitian can help spread it across the day. Exact per-meal targets are less proven than daily totals (Bauer 2013).
- Pair it with strength work. U.S. guidelines call for muscle-strengthening activity at least 2 days a week (Piercy 2018).
- Think pattern, not just protein. A Mediterranean-style pattern lowered heart events in a large trial (Estruch 2018), and higher-fiber, whole-grain eating is linked with better health (Reynolds 2019).
- Re-check strength, not just weight. Track something you can repeat, like a carry, a sit-to-stand or grip strength, with your trainer or clinician.
Who on my care team handles what?
- Your clinician checks kidney function and medications before you change protein a lot.
- A registered dietitian turns a daily range into real meals you'll actually eat.
- A trainer or physical therapist builds the strength plan that gives protein something to do.
- A pharmacist checks protein powders and supplements against your medications.
Where it breaks: the trainer says "eat more protein," the dietitian has never seen your training plan, and nobody checked your kidney labs first. One shared summary fixes most of that.
How does the DAITT® Method connect to this?
DAITT® (say it like “date”) is our five-part way to look at a whole life. In wellness, the letters stand for Discipline of the body, Awareness, Intellect, Trust and Treasury. Here's how each one touches this question:
- Discipline of the body: Protein spread across meals, plus strength work your body can recover from.
- Awareness: Notice whether food rules or guilt are driving your choices.
- Intellect: Learn the difference between a daily range backed by research and a per-meal number from a podcast.
- Trust: Protect what you want your body to do in 20 years, not just next month.
- Treasury: Budget for a dietitian visit before buying another supplement. The money side lives on drpatclarity.com.
Have you made a DAITT® with your future self? Take the free wellness DAITT® quiz on drpat.co. No forms, and nothing is saved.
What does the math look like?
Illustration
An illustration of the arithmetic, not a recommendation for you. Take a woman who weighs 150 pounds. That's about 68 kilograms (150 ÷ 2.2).
At the PROT-AGE range of 1.0 to 1.2 grams per kilogram, that's about 68 to 82 grams of protein a day. At 1.2 grams per kilogram, the level PROT-AGE suggests for active older adults, it's about 82 grams. The 1.6 grams per kilogram point, where extra protein stopped adding lean mass in strength-training trials, works out to about 109 grams (Bauer 2013; Morton 2018).
If her day looks like a coffee and toast breakfast, a salad at lunch and chicken at dinner, most of her protein lands at night. A dietitian might help her move some to breakfast and lunch. Her clinician confirms her kidneys are fine first.
What do the experts say, and where does the evidence land?
Dr. Mary Claire Haver and Dr. Stacy Sims both emphasize protein and strength training in midlife. Dr. Gabrielle Lyon (on Huberman Lab and in Forever Strong) and Dr. Peter Attia (in Outlive) go further with specific per-meal targets. Here's the evidence check: research supports more protein for older adults (Bauer 2013), but exact per-meal targets are less proven. Dr. Sims also co-authored the International Society of Sports Nutrition's position stand on nutrition concerns for female athletes (Sims 2023). Set your own amount with your clinician or dietitian.
Related questions
Do women need more protein after menopause?
Expert groups say older adults likely need more protein than the basic daily amount. PROT-AGE recommends at least 1.0 to 1.2 g per kg per day for adults over 65, more if active, with an exception for severe kidney disease (Bauer 2013). Your amount should be set with your clinician or dietitian.
Is there a point where more protein stops helping muscle?
In a meta-analysis of strength-training trials, protein added beyond about 1.6 g per kg per day didn't produce further gains in lean mass (Morton 2018).
Is intermittent fasting good for women in menopause?
It's optional, not required. In a 12-week trial, eating only between noon and 8 PM wasn't more effective for weight loss than regular meals, and some lean mass was lost (Lowe 2020). Ask your clinician whether it's safe for you.
Sources
Peer-reviewed research
- Morton RW et al. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med, 52:376-384.
- Greendale GA et al. (2019). Changes in body composition and weight during the menopause transition. JCI Insight, 4.
- Lowe DA et al. (2020). Effects of Time-Restricted Eating on Weight Loss and Other Metabolic Parameters in Women and Men With Overweight and Obesity: The TREAT Randomized Clinical Trial. JAMA Intern Med, 180:1491-1499.
- Estruch R et al. (2018). Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts. N Engl J Med, 378:e34.
- Reynolds A et al. (2019). Carbohydrate quality and human health: a series of systematic reviews and meta-analyses. Lancet, 393:434-445.
Medical societies and government
- Bauer J et al. (2013). Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J Am Med Dir Assoc, 14:542-59.
- Cruz-Jentoft AJ et al. (2019). Sarcopenia: revised European consensus on definition and diagnosis. Age Ageing, 48:16-31.
- Piercy KL et al. (2018). The Physical Activity Guidelines for Americans. JAMA, 320:2020-2028.
- Sims ST et al. (2023). International society of sports nutrition position stand: nutritional concerns of the female athlete. J Int Soc Sports Nutr, 20:2204066.
Expert voices (commentary, not research)
- Dr. Mary Claire Haver (OB/GYN). The New Menopause (book, Rodale, 2024).
- Dr. Mary Claire Haver on Huberman Lab. How to Navigate Menopause & Perimenopause for Maximum Health & Vitality (podcast episode, June 2024).
- Dr. Stacy Sims (exercise physiologist). Next Level: Menopause and Beyond (book, Rodale, 2022).
- Dr. Stacy Sims on Huberman Lab. Female-Specific Exercise & Nutrition for Health, Performance & Longevity (podcast episode, July 2024).
- Dr. Gabrielle Lyon on Huberman Lab. How to Exercise & Eat for Optimal Health & Longevity (podcast episode, June 2024).
- Dr. Peter Attia. Outlive: The Science and Art of Longevity (book, 2023).
- Dr. Gabrielle Lyon (physician, muscle-centric medicine). Forever Strong (book, Atria, 2023).
What's a good next step?
Start by learning, not buying. Read the short summary of this topic in the Women's Metabolic Clarity library at Pinnacle Coordinated Wellness, take the wellness DAITT® quiz, and bring the questions above to your clinician. If you'd like to see how a coordinated, done-with-you care team works, visit pinnaclecoordinatedwellness.com.
Read the library summaryTake the wellness DAITT® quiz
Questions to ask a licensed clinician
- How much protein is right for me, given my health and kidneys?
- Are there any reasons I should be careful raising protein?
- Can you refer me to a registered dietitian?
- Should I check my strength or muscle level as a health marker?
- Is a protein powder or supplement safe with my medications?
- Is time-restricted eating safe for me, and how would I protect my muscle?
Bring these, a short symptom log and your medication list to your next visit.
Who is Dr. Pat Pachciarz®?
Dr. Pat Pachciarz® is the founder of Pinnacle Coordinated Wellness and Founder & CEO of The Pinnacle Group in Aurora, Illinois. He is a Certified Personal Trainer and Certified Nutrition Coach through the National Academy of Sports Medicine. He's the guide and educator here, not a clinician: he teaches how to think about coordination and what to ask your licensed clinicians. More about Dr. Pat Pachciarz®.
More answers
- Should I lift weights or do cardio after 40?
- Why am I gaining weight in perimenopause when nothing else changed?
- Why is my blood sugar creeping up after menopause?
- What bloodwork should I ask for in perimenopause and menopause?
- Why can't I sleep through the night in perimenopause?
- Is my brain fog perimenopause, and will it go away?
- Is menopause hormone therapy safe? What changed in 2025?
- Is cortisol causing my belly fat in menopause?
- Why do I feel so guilty when I can't keep up with my workouts?
Also see Pinnacle Coordinated Wellness, drpat.co for the wealth and wellness crossover, and drpatclarity.com for family money questions.