A 67-year-old woman likely needs somewhere between 1.0 and 1.2 grams of protein per kilogram of body weight per day, and possibly more if she exercises regularly or is dealing with illness. That range, recommended by an international panel of researchers, is meaningfully higher than the standard government guideline of 0.8 grams per kilogram that applies uniformly to all adults. The gap between the two numbers reflects decades of research into how aging changes the way your body uses dietary protein, with particular relevance to women after menopause.
Why the Standard Recommendation Falls Short
The current Recommended Dietary Allowance for protein in the United States is 0.8 grams per kilogram of body weight per day for all adults, regardless of age. For a 67-year-old woman weighing around 150 pounds (68 kg), that works out to roughly 55 grams of protein daily. The PROT-AGE study group, an international consortium of geriatric and nutrition researchers, concluded that this number is too low for people over 65. Their position paper recommends a daily intake of at least 1.0 to 1.2 grams per kilogram to help older adults maintain lean body mass and function.1Journal of the American Medical Directors Association. Evidence-Based Recommendations for Optimal Dietary Protein Intake in Older People: A Position Paper From the PROT-AGE Study Group For the same 150-pound woman, that translates to about 68 to 82 grams of protein per day.
A separate review of the evidence came to a similar conclusion, noting that the standard RDA does not increase with age despite the growing body of research suggesting it should.2PubMed Central. Protein Requirements and Recommendations for Older People: A Review The disconnect exists partly because the RDA was originally established using nitrogen balance studies in younger adults. More recent work using a different measurement technique in women over 80 found that their actual protein requirement was about 29% higher than the estimated average requirement the RDA is based on, with an adequate allowance of around 1.15 grams per kilogram per day.3PubMed Central. Assessment of protein requirement in octogenarian women with use of the indicator amino acid oxidation technique In other words, even the updated expert recommendations may be conservative for some older women.
Anabolic Resistance and the Aging Muscle
The reason older adults need more protein per kilogram is not that they waste more of it or absorb less of it overall, though digestive changes do play a role. The core problem is that aging muscle becomes less responsive to the signal protein sends to trigger muscle building. Researchers call this “anabolic resistance,” and it means that the same serving of chicken breast that would fully activate muscle repair in a 30-year-old may only partially activate it in a 67-year-old.4PubMed. Anabolic resistance of muscle protein synthesis with aging You can think of it as a dimmer switch that has been turned down: the signal still gets through, but you need a stronger signal to get the same response.
Research into overcoming this resistance points to two practical strategies: eating protein sources rich in the amino acid leucine, and eating enough protein at each sitting to cross the threshold where muscle-building kicks in.5Advances in Nutrition. Keeping Older Muscle “Young” through Dietary Protein and Physical Activity Current evidence on leucine requirements in older men and women suggests that standard recommendations for this amino acid should be revised upward as well.6PubMed Central. Dietary leucine requirement of older men and women is higher than current recommendations
Why Protein Matters Even More for Women After Menopause
Women face an additional challenge that men do not. The drop in estrogen around menopause accelerates muscle loss, and the anabolic response to exercise appears to be dampened in postmenopausal women compared to premenopausal women or men of similar ages.7PubMed Central. Transdermal Estrogen Therapy Improves Gains in Skeletal Muscle Mass After 12 Weeks of Resistance Training in Early Postmenopausal Women This means a 67-year-old woman is dealing with two compounding forces: the age-related anabolic resistance that affects everyone, and the hormonal shift that makes muscle maintenance harder specifically for women. Adequate protein intake becomes one of the most accessible tools for pushing back against both of those forces simultaneously.
A study of postmenopausal women aged 60 to 90 found that those who consumed more protein performed significantly better on physical function tests. They could stand on one leg longer, walked faster over a short distance, and scored higher on composite measures of physical performance than women eating less protein.8The Journal of nutrition, health and aging. Adequate dietary protein is associated with better physical performance among post-menopausal women 60–90 years These are the kinds of functional differences that affect daily life: catching yourself when you trip, climbing stairs without strain, maintaining independence.
The Per-Meal Threshold
One practical question that comes up often is whether it matters how you spread your protein across the day. Research on this has been somewhat surprising. The idea that you should eat protein evenly at each meal, aiming for roughly 25 to 30 grams per sitting, sounds logical given the anabolic resistance problem. Some researchers have proposed that roughly 30 grams per meal represents a promising threshold for older adults wanting to maintain muscle while controlling body fat.9PubMed Central. Dietary protein and muscle in older persons
However, controlled trials comparing even distribution versus skewed distribution (eating most protein at one meal) have not found a clear winner. A randomized trial in healthy older adults found no difference in muscle protein synthesis between evenly and unevenly distributed protein patterns.10PubMed Central. Comparing Even with Skewed Dietary Protein Distribution Shows No Difference in Muscle Protein Synthesis or Amino Acid Utilization in Healthy Older Individuals: A Randomized Controlled Trial An eight-week trial confirmed the same result for lean body mass, muscle strength, and functional outcomes.11PubMed Central. Protein intake distribution pattern does not affect anabolic response, lean body mass, muscle strength or function over 8 weeks in older adults: A randomized-controlled trial The takeaway: getting enough total protein over the course of a day matters more than obsessing over exactly how it is divided between meals. If you find it easier to eat a protein-rich breakfast and a lighter dinner, or vice versa, the evidence suggests that is fine as long as the daily total hits the right range.
Animal Protein, Plant Protein, and Practical Choices
Not all protein sources trigger muscle building equally. Animal-based proteins from meat, dairy, eggs, and fish tend to produce a stronger muscle protein response than plant-based proteins from soy, wheat, legumes, and grains. The difference comes down to digestibility, the amino acid profile (especially leucine content), and how much of the protein gets diverted to other uses before it reaches muscle tissue.12PubMed Central. The Role of the Anabolic Properties of Plant- versus Animal-Based Protein Sources in Supporting Muscle Mass Maintenance: A Critical Review Plant proteins generally have less leucine and may lack adequate amounts of certain other essential amino acids.13PubMed. The Skeletal Muscle Anabolic Response to Plant- versus Animal-Based Protein Consumption
This does not mean plant protein is useless for muscle. A large cohort study found that higher intake of both animal and plant protein was associated with significantly lower odds of sarcopenic obesity.14PubMed. Dietary intake of total protein, animal- and plant-based protein is associated with a lower likelihood of having sarcopenic obesity If you eat a mostly plant-based diet, you may need to eat somewhat more total protein and be strategic about combining sources (legumes with grains, for instance) to cover the full range of amino acids. Adding dairy or eggs, even in small amounts, can fill the gaps. One study of postmenopausal women found that adding soy protein to milk during 16 weeks of resistance training roughly doubled their strength gains compared to a group that did resistance training without supplemental protein.15PubMed. Adding Soy Protein to Milk Enhances the Effect of Resistance Training on Muscle Strength in Postmenopausal Women Combining protein sources appears to work better than relying on a single plant protein alone.
Exercise Changes the Equation
Protein intake and resistance training are far more powerful together than either one is alone. A meta-analysis of whey protein supplementation in postmenopausal women found that the protein only improved strength and lean mass when paired with resistance training. In the subgroup that did resistance training, whey supplementation significantly boosted bicep curl strength and lower-limb lean mass. In the subgroup that did not exercise, the extra protein had no measurable effect on muscle and actually corresponded to slightly lower overall dietary intake, suggesting the supplement just replaced other food.16PubMed Central. Effect of Whey Protein Supplementation in Postmenopausal Women: A Systematic Review and Meta-Analysis
A trial in overweight and obese older adults makes the same point from a different angle: a high-protein diet combined with resistance exercise increased fat-free mass, while high protein alone or exercise alone did not produce statistically significant changes.17PubMed Central. Effect of a high protein diet and/or resistance exercise on the preservation of fat free mass during weight loss in overweight and obese older adults: a randomized controlled trial If you are already lifting weights, walking with a weighted vest, or doing bodyweight exercises like squats and push-ups, your protein intake is doing double duty. If you are not exercising, even a perfect diet may not be enough to maintain the muscle you have.
Sarcopenic Obesity and Losing Weight After 65
Sarcopenic obesity, the combination of too little muscle and too much body fat, is common in older women and creates a vicious cycle. Excess weight stresses the joints and limits activity, while insufficient muscle makes movement harder and metabolism slower. The standard advice to simply “eat less” is risky here because calorie restriction without adequate protein can strip away the very muscle you are trying to protect.
In a study of sarcopenic obese women, those on a calorie-reduced diet with normal protein intake lost significant muscle mass. Those on a calorie-reduced diet with higher protein actually gained muscle mass despite eating fewer calories overall.18PubMed Central. Dietary protein intake in sarcopenic obese older women A trial pairing whey protein supplementation with resistance training in older women with sarcopenic obesity found that the protein group gained about 6% more appendicular lean mass and lost about 5% more trunk fat than the group that exercised without extra protein.19PubMed. Effect of whey protein supplementation combined with resistance training on body composition, muscular strength, functional capacity, and plasma-metabolism biomarkers in older women with sarcopenic obesity For a 67-year-old woman who is both overweight and noticing she’s weaker than she used to be, keeping protein high while cutting calories from refined carbohydrates and excess fat is a much safer strategy than an indiscriminate calorie cut.
Will Extra Protein Hurt Your Kidneys?
This is probably the most common worry people have about eating more protein, and it deserves a careful answer. High protein intake can increase the filtering pressure inside the kidneys, a phenomenon that in theory could stress them over time.20PubMed Central. The Effects of High-Protein Diets on Kidney Health and Longevity But the clinical evidence in people with healthy kidneys tells a different story. A systematic review looking specifically at community-dwelling older adults found that five out of six included studies showed no significant association between protein intake and kidney function decline.21PubMed. Association Between Dietary Protein Intake and Kidney Function in Community-Dwelling Older Adults: A Systematic Review
A meta-analysis of randomized trials in adults without chronic kidney disease found that high-protein diets did not significantly change serum creatinine, a standard marker of kidney injury, and showed no consistent biochemical signs of kidney damage.22PubMed Central. Effects of High‐Protein Diets on Renal Function and Body Composition in Adults Without Chronic Kidney Disease: A Systematic Review and Meta‐Analysis of Randomised Trials The caveat is important: if you already have kidney disease, the rules change. People with moderate to advanced chronic kidney disease typically need to restrict protein, not increase it. If you are unsure about your kidney function, a basic blood test can settle the question. For a 67-year-old woman with normal kidney function, the evidence does not support avoiding the 1.0 to 1.2 g/kg range out of kidney concerns.
Protein and Bone Health
An older concern that sometimes resurfaces is whether high protein intake leaches calcium from bones. The evidence has largely put this worry to rest. A systematic review and meta-analysis commissioned by the National Osteoporosis Foundation found no adverse effects of higher protein intake on bone. There was moderate evidence that higher protein had a small protective effect on lumbar spine bone mineral density, though the benefit at other bone sites was not statistically clear.23The American Journal of Clinical Nutrition. Dietary protein and bone health: a systematic review and meta-analysis from the National Osteoporosis Foundation
The picture is mixed when you look at fracture outcomes specifically. Data from the Women’s Health Initiative, which followed roughly 140,000 women aged 50 to 79, showed that women who consumed more protein maintained higher total bone mineral density, but this did not translate into significantly fewer hip or spine fractures. There was a protective effect on forearm fractures.24PubMed Central. Impact of Dietary Protein on Osteoporosis Development At minimum, the data indicate that adequate protein is not harmful to bones and may be modestly helpful, especially at the spine, which is one of the sites most vulnerable to osteoporotic fracture in older women.
Practical Barriers to Getting Enough
Knowing you need 70 to 80 grams of protein a day and actually eating that much are different problems. In the United States, roughly half of women over 71 consume inadequate protein.25PubMed Central. Protein and Aging: Practicalities and Practice The reasons are partly biological: appetite declines with age, digestive efficiency drops, and chewing can become harder with dental problems. But social and economic factors matter too. Cooking for one after a partner dies, limited income for groceries, and depression can all reduce both the desire and the ability to prepare protein-rich meals.
Aging also changes how the gut processes protein. Reduced stomach acid and fewer digestive enzymes slow the breakdown of protein in the stomach and small intestine. Weaker gut motility delays transit of digested protein, and amino acid transporter function in the intestines and muscles declines, limiting how much of what you eat actually reaches the tissues that need it. These changes do not eliminate the benefit of eating more protein, but they do mean that a 67-year-old woman absorbs and uses dietary protein less efficiently than she did at 40, which is yet another reason the daily target needs to be higher.
Some practical strategies that help: keeping grab-and-go protein options on hand (Greek yogurt, hard-boiled eggs, cheese sticks, single-serve tuna packets), building meals around a protein anchor first and adding vegetables and starches around it, and considering a protein supplement if whole foods are hard to manage. Whey protein mixed into a smoothie or oatmeal is one of the most studied and effective supplemental options for older women, though any complete protein source counts toward the daily total.
When Illness Raises the Bar Further
The 1.0 to 1.2 g/kg recommendation applies to generally healthy older adults. During acute illness, hospitalization, or recovery from surgery, the body’s protein demands spike. Critically ill older patients present a particular nutritional challenge because their needs change across the phases of illness and recovery, and inadequate protein during a hospital stay can accelerate the loss of muscle that may never fully come back.26PubMed Central. Protein Requirements in Critically Ill Older Adults Even a two-week bout of bed rest from a bad flu can cost an older woman measurable muscle mass. During recovery from any significant illness, keeping protein intake at the higher end of the recommended range, or above it if tolerated, can help limit the damage.
Skin, Connective Tissue, and Protein Beyond Muscle
Most of the conversation about protein and aging focuses on muscle, but protein is also the raw material for collagen, the structural protein in skin, tendons, cartilage, and blood vessels. Collagen production slows with age and drops more sharply after menopause, contributing to thinner skin, slower wound healing, and joint stiffness. While eating more protein will not reverse decades of collagen loss, it provides the amino acids (especially glycine and proline) that your body needs to maintain the connective tissue it has.
Soy protein has drawn particular interest in postmenopausal women because of its isoflavone content. A randomized controlled trial found that postmenopausal women taking a soy protein supplement with isoflavones showed reduced wrinkle severity by about 7% at 24 weeks compared to baseline, and skin hydration increased substantially on both cheeks compared to a control group. These effects were attributed both to the protein content and to the estrogenic activity of soy isoflavones. For a 67-year-old woman, choosing some soy-based protein sources alongside animal protein could offer benefits that extend beyond the gym.