Most research-backed expert groups recommend that a healthy 73-year-old woman eat roughly 1.0 to 1.2 grams of protein per kilogram of body weight each day, which works out to about 60 to 80 grams for a woman weighing around 150 pounds. That is meaningfully more than the standard Recommended Dietary Allowance of 0.8 grams per kilogram, which was set for all adults regardless of age and which many geriatric nutrition researchers now consider inadequate for older people. The gap between that official baseline and what the evidence actually supports is where things get interesting.
Why the Standard Recommendation Falls Short
The RDA of 0.8 grams of protein per kilogram of body weight per day was designed to prevent deficiency in the general adult population, not to optimize health in someone in her seventies. The PROT-AGE Study Group, an international panel of geriatric nutrition experts, has stated directly that this recommendation is too low for older people and that maintaining lean body mass requires eating above that level.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 The distinction matters because the RDA is not a target for good health; it is a minimum to avoid clinical protein deficiency. For a 73-year-old woman trying to stay strong, independent, and resilient, “not deficient” is a low bar.
The reason the number needs to be higher has to do with how aging muscle responds to protein. Older adults require a larger dose of protein to trigger the same muscle-building response that a younger person gets from a smaller serving.2PubMed Central. Protein Consumption and the Elderly: What Is the Optimal Level of Intake? You are not just eating to maintain the status quo; you are eating to overcome a biological headwind that gets stronger with age.
The Muscle-Building Headwind of Aging
The technical name for this headwind is anabolic resistance. In simple terms, it means your muscles become less efficient at using the protein you eat to repair and build new tissue. A 30-year-old eating a chicken breast gets a strong muscle-building signal. A 73-year-old eating the same chicken breast gets a weaker one. This blunted response is recognized as a key contributor to the gradual loss of muscle mass that occurs with aging.3PubMed Central. Age-Related Anabolic Resistance: Nutritional and Exercise Strategies, and Potential Relevance to Life-Long Exercisers4PubMed. Age-related muscle anabolic resistance: inevitable or preventable?
One reason this happens involves what occurs between your mouth and your muscles. As you age, your gut and liver tend to extract and use a larger share of the amino acids from your food before they reach your bloodstream. Research in animal models has found that this increased extraction can lower the amount of dietary amino acids circulating in the blood by roughly 20 to 30 percent compared to younger subjects.5PLoS ONE. Features, Causes and Consequences of Splanchnic Sequestration of Amino Acid in Old Rats In humans, this same process has been implicated in the weakened muscle response to meals, though researchers are still working out exactly how large the effect is.6PubMed Central. Dietary protein splanchnic uptake and digestibility via stable isotope tracers The practical upshot is straightforward: because less of what you eat gets to your muscles, you need to eat more of it.
How Protein Protects Against Frailty
Frailty, the state of being physically vulnerable to even minor health stresses, is one of the biggest threats to independence in older age. A study of older Finnish women found that those eating at least 1.1 grams of protein per kilogram of body weight were far less likely to be frail or pre-frail at a three-year follow-up, and were also less likely to have slow walking speed or weak grip strength.7PubMed Central. Higher protein intake is associated with a lower likelihood of frailty among older women, Kuopio OSTPRE-Fracture Prevention Study
Separate research in elderly women found that those eating 1.2 grams per kilogram or more performed better across a wide range of physical tests, including hand-grip strength, walking speed, chair rises, and balance tasks. Over a three-year follow-up, the higher-protein group also showed less decline in grip strength and balance.8PubMed. Dietary protein intake is associated with better physical function and muscle strength among elderly women These are observational studies, so higher protein intake could partly reflect an overall healthier lifestyle. But the pattern is consistent enough that the 1.0 to 1.2 gram range keeps showing up as the threshold where real functional benefits appear.
A Study Directly in Elderly Women
One of the more useful pieces of evidence for a 73-year-old woman comes from a study that specifically tested what happens when community-dwelling elderly women increase their protein to 1.2 to 1.3 grams per kilogram while doing light-to-moderate resistance exercise. The women gained muscle mass, improved their walking speed, and increased their knee strength.9Journal of Aging Research and Lifestyle. EFFECT OF INCREASED DAILY INTAKE OF PROTEIN, COMBINED WITH A PROGRAM OF RESISTANCE EXERCISES, ON THE MUSCLE MASS AND PHYSICAL FUNCTION OF COMMUNITY-DWELLING ELDERLY WOMEN Another study found that elderly women eating above 1.2 grams per kilogram had significantly more muscle mass and bone mass than those eating less.10PubMed. Dietary protein intake in elderly women: association with muscle and bone mass That 1.2 gram figure comes up so often in the literature that it serves as a reasonable practical target for a healthy older woman.
Spreading Protein Across Meals
How you distribute protein throughout the day matters almost as much as how much you eat in total. Many older adults eat very little protein at breakfast, a moderate amount at lunch, and then load up at dinner. Research has shown that spreading protein more evenly across three meals, rather than concentrating it at one, produced about 25 percent more muscle protein building over a 24-hour period.11The Journal of Nutrition. Dietary Protein Distribution Positively Influences 24-h Muscle Protein Synthesis in Healthy Adults
For a 73-year-old woman aiming for roughly 70 grams of protein a day, that means trying to get around 20 to 25 grams at each meal rather than eating 10 grams at breakfast and 45 at dinner. Practically, that could look like Greek yogurt with nuts at breakfast, a bean and cheese wrap at lunch, and a serving of fish or chicken at dinner. The even-distribution approach gives your muscles three strong anabolic signals per day instead of one overwhelming dose that partly goes to waste.
Leucine and Protein Quality
Not all protein sources are equally effective at stimulating muscle building in older adults. The amino acid leucine acts as the primary trigger for muscle protein synthesis, and older muscles need a higher proportion of leucine to get the signal through. Research has shown that older adults failed to increase muscle protein building when given a standard essential amino acid mixture, but did respond when the leucine content was increased to a much higher proportion of the mix.12PubMed. A high proportion of leucine is required for optimal stimulation of the rate of muscle protein synthesis by essential amino acids in the elderly
This has practical implications for food choices. Animal proteins like eggs, dairy, chicken, fish, and beef are generally richer in leucine and produce a stronger muscle-building response than most plant proteins. Plant-based sources like soy and wheat tend to be lower in leucine, are digested somewhat differently, and produce a weaker muscle-building signal per gram.13The Journal of Nutrition. The Skeletal Muscle Anabolic Response to Plant- versus Animal-Based Protein Consumption That does not mean plant proteins are useless. It means that someone relying primarily on plant sources may need to eat a larger total amount of protein and pay attention to combining different plant proteins to cover their amino acid needs. Dairy products like whey and Greek yogurt are particularly leucine-rich and convenient options for older women who tolerate them well.
Exercise Changes the Equation
Protein and resistance exercise work together in a way that makes each more effective. In a study of older women who were already doing resistance training, adding whey protein supplementation produced nearly double the gains in skeletal muscle mass and substantially greater strength improvements compared to training with a placebo.14PubMed. Effects of Whey Protein Supplementation Associated With Resistance Training on Muscular Strength, Hypertrophy, and Muscle Quality in Preconditioned Older Women
The evidence is not unanimous, though. A more recent trial that randomized middle-aged and older women to different protein targets alongside either resistance training or concurrent training found no clear difference in skeletal muscle mass across the protein groups.15PubMed Central. Resistance versus concurrent training with three assigned protein targets in middle-aged and older women: a randomized 2 × 3 factorial trial The discrepancy may come down to differences in study design, the women’s baseline fitness, or how much extra protein they were actually eating above what they normally consumed. The weight of evidence still favors combining adequate protein with some form of strength training, but the protein alone does not produce miraculous gains. The exercise is not optional if the goal is to maintain or build muscle.
Protein and Bone Density
Bone health is a major concern for women in their seventies, and protein plays a role there too. A large cross-sectional study of older adults found that higher total protein intake was associated with higher bone mineral density at the spine and whole body.16PubMed Central. Protein intake and bone mineral density: Cross‐sectional relationship and longitudinal effects in older adults A systematic review and meta-analysis for the National Osteoporosis Foundation found moderate evidence that higher protein protects bone density at the lumbar spine, though the evidence was less clear at the hip and other sites.17The American Journal of Clinical Nutrition. Dietary protein and bone health: a systematic review and meta-analysis from the National Osteoporosis Foundation
An interesting wrinkle comes from a large analysis of U.S. adults that found a threshold effect in women: below about 61 grams of protein per day, each additional gram was associated with a measurable increase in bone density, but above that threshold the relationship flattened out.18Scientific Reports. Association between dietary protein intake and bone mineral density based on NHANES 2011–2018 This suggests that for bones specifically, getting enough protein matters a great deal, but piling on extra protein beyond a reasonable intake does not keep delivering additional bone benefits. The 60-to-80-gram range that most older women should be targeting already clears that threshold comfortably.
What Happens When You Are Trying to Lose Weight
Weight loss in your seventies is a double-edged sword. Losing excess body fat can improve mobility, joint pain, and metabolic health, but dieting always costs some muscle mass along with the fat. For an older woman, preserving muscle during weight loss is critical. A study of postmenopausal women on a reduced-calorie diet found that those assigned to a higher-protein version lost significantly less lean mass and less arm and leg muscle mass than those on a lower-protein version, even though both groups lost a similar amount of fat.19The Journal of nutrition, health and aging. Effects of dietary protein on the composition of weight loss in post-menopausal women
Another trial in postmenopausal women with obesity found that protein supplementation during weight loss helped cushion the initial loss of thigh muscle, though the protective effect on muscle was small and did not translate into measurable strength differences.20PubMed Central. Effect of protein supplementation during diet-induced weight loss on muscle mass and strength: a randomized controlled study If you are a 73-year-old woman intentionally losing weight, keeping your protein high is one of the simplest things you can do to make sure you are losing fat, not the muscle you need to stay on your feet.
Is More Protein Safe for Your Kidneys?
One of the most persistent concerns about higher protein intake is the fear of kidney damage. For someone with existing kidney disease, high protein intake does need to be managed carefully, and a doctor should set the limits. But for healthy older adults, the evidence is reassuring. A systematic review of both controlled trials and observational studies found that protein intake within the recommended range was consistent with normal kidney function in healthy people.21Advances in Nutrition. A Systematic Review of Renal Health in Healthy Individuals Associated with Protein Intake above the US Recommended Daily Allowance in Randomized Controlled Trials and Observational Studies Eating 1.0 to 1.2 grams per kilogram is not the same as eating extreme bodybuilder-level quantities of protein. It is a modest increase above the minimum, and healthy kidneys handle it without trouble.
When Protein Needs Climb Higher
The 1.0 to 1.2 gram range applies to a healthy, relatively active 73-year-old woman living at home. If she becomes seriously ill, is hospitalized, or is recovering from surgery, her protein needs can jump substantially. Critical illness breaks down muscle tissue rapidly, and the body’s protein demands increase to support wound healing, immune function, and recovery. Experts in geriatric critical care have noted that nutritional needs in critically ill elderly patients vary with the phase of illness and recovery, and that protein supplementation should be assessed early and adjusted throughout the hospital stay and into rehabilitation.22PubMed Central. Protein Requirements in Critically Ill Older Adults Some guidelines for acutely ill or recovering older adults push the target to 1.2 to 1.5 grams per kilogram or even higher, depending on the situation.
The Appetite Problem
Knowing how much protein you need is one thing. Actually eating it is another. Many older adults experience a gradual decline in appetite that researchers call the anorexia of aging. It is driven by changes in hormones, slower stomach emptying, blunted taste and smell, medications, depression, and social isolation. The result is that many older people simply do not eat enough food to meet their energy and nutrient needs.23PubMed Central. Anorexia of Aging: Risk Factors, Consequences, and Potential Treatments This appetite decline is linked to a cascade of problems including muscle loss, frailty, and increased risk of death.24PubMed Central. Mechanisms of the anorexia of aging-a review
When whole food feels like too much, oral nutritional supplements like protein shakes or fortified drinks can help bridge the gap. These products are a clinically effective and relatively inexpensive way to boost intake, but adherence can be a challenge, especially in the older adults who need them most. Problems like unpleasant aftertaste from the nutritional ingredients are a real barrier for many people.25PubMed Central. Factors Affecting Adherence, Intake, and Perceived Palatability of Oral Nutritional Supplements: A Literature Review Experimenting with different brands, flavors, and temperatures can help. Some women find that adding unflavored protein powder to oatmeal, soup, or smoothies is more palatable than drinking a ready-made shake.
Protein and the Gut Microbiome in Older Adults
An emerging area of research looks at how protein intake shapes the community of bacteria living in the gut, which influences digestion, immune function, and inflammation. A study of older men found that those with higher protein intakes had greater diversity in their gut microbiome, which is generally considered a marker of gut health. Both animal and plant protein sources were associated with this increased diversity.26PubMed Central. Relation Between Dietary Protein Intake and Gut Microbiome Composition in Community-Dwelling Older Men: Findings from the Osteoporotic Fractures in Men Study (MrOS)
A trial in older women found that switching to a high-protein diet shifted the gut bacteria composition, increasing some beneficial groups like Lactobacillus while reducing some butyrate-producing bacteria.27PubMed. Microbiota Stability and Gastrointestinal Tolerance in Response to a High-Protein Diet with and without a Prebiotic, Probiotic, and Synbiotic: A Randomized, Double-Blind, Placebo-Controlled Trial in Older Women This is a reminder that protein does not act in isolation. Pairing adequate protein intake with plenty of fiber from vegetables, whole grains, and fruit helps keep the gut ecosystem balanced. For a 73-year-old woman adjusting her diet to get more protein, the best approach is not to simply add protein on top of everything else, but to build meals around protein-rich foods alongside the fiber-rich plant foods that feed beneficial gut bacteria.