A 73-year-old woman needs more protein than the government minimum suggests. The official Recommended Dietary Allowance (RDA) is 0.8 grams per kilogram of body weight per day, the same number set for all adults 19 and older. But geriatric nutrition experts now widely agree that older adults should aim higher, at 1.0 to 1.2 grams per kilogram daily, to protect muscle mass, strength, and overall function. For a woman weighing around 150 pounds (68 kg), that translates to roughly 68 to 82 grams of protein per day, rather than the 54 grams the RDA would prescribe.
Why the Standard RDA Falls Short
The RDA of 0.8 g/kg was designed to prevent protein deficiency in the general adult population. It was never intended as an optimal target for aging bodies. After about age 65, muscles become less responsive to the protein you eat. Your body still breaks down and rebuilds muscle tissue constantly, but the rebuilding side of that equation slows down. This phenomenon, sometimes called anabolic resistance, means older adults need a stronger dietary signal to maintain the same muscle-building response a younger person gets from a smaller meal.
Both the European Society for Clinical Nutrition and Metabolism (ESPEN) and the international PROT-AGE study group have published recommendations reflecting this. ESPEN advises at least 1.0 to 1.2 g/kg daily for healthy older adults, rising to 1.2 to 1.5 g/kg for those who are malnourished, recovering from illness, or managing a chronic condition. The PROT-AGE group recommends 1.0 to 1.5 g/kg for everyone over 65, adjusting within that range based on health status.
How to Calculate Your Personal Target
The math is straightforward. Divide your weight in pounds by 2.2 to get your weight in kilograms, then multiply by your target range.
- 130-pound woman (59 kg): 59 to 71 grams per day at 1.0–1.2 g/kg
- 150-pound woman (68 kg): 68 to 82 grams per day
- 170-pound woman (77 kg): 77 to 93 grams per day
If you’re recovering from surgery, managing an infection, or dealing with significant weight loss, your needs shift toward the higher end of the range or beyond it. If you carry significant extra weight, using an adjusted or ideal body weight rather than your actual weight gives a more accurate number. Your doctor or a dietitian can help you pin that down.
Spreading Protein Across Meals Matters
How you distribute your protein throughout the day is nearly as important as how much you eat in total. Research on muscle-building in older adults points to a clear threshold: each meal should contain 25 to 30 grams of protein to trigger meaningful muscle repair. Below that amount, your muscles may not get enough of the amino acid leucine to kick-start the rebuilding process.
Leucine is the key amino acid that signals your muscles to start synthesizing new protein. Younger adults can hit that signal with relatively small amounts, but older adults need about 2.5 to 3 grams of leucine per meal to get the same effect. A study in healthy women aged 65 to 75 found that the presence of adequate leucine, not just total protein, was the primary driver of increased muscle protein production. That 25-to-30-gram-per-meal target naturally provides enough leucine when you’re eating quality protein sources.
The practical implication: eating 10 grams of protein at breakfast and 60 grams at dinner is less effective than eating 25 to 30 grams at each of three meals. Many older women eat very little protein at breakfast, so that meal is often the best place to start making changes.
Best Protein Sources for Older Adults
A wide variety of foods can get you to your daily target. Lean meats, fish, eggs, dairy products, beans, lentils, nuts, seeds, and soy products all contribute. Animal-based proteins tend to have a more complete amino acid profile and are absorbed more readily. That doesn’t mean plant proteins are inadequate, but you may need slightly larger portions of beans or lentils to match what you’d get from a piece of chicken or fish.
For reference, a palm-sized portion of chicken breast (about 4 ounces cooked) provides roughly 30 grams of protein. A cup of Greek yogurt has around 15 to 20 grams. Two eggs provide about 12 grams. A cup of cooked lentils delivers about 18 grams. Combining a few of these at each meal makes reaching 25 to 30 grams realistic without dramatically changing how you eat.
If appetite is low or chewing is difficult, protein powders can help fill the gap. Whey protein in particular has strong evidence for supporting muscle maintenance in older adults, outperforming both plant-based and casein powders in studies. Soy protein isolate is a reasonable alternative for anyone avoiding dairy, though its amino acid profile and absorption rate are somewhat lower. Some people experience digestive discomfort with dairy-based powders, so trying a small amount first makes sense.
Protein and Bone Health
Bone density is a major concern for women in their 70s, and protein plays a supporting role here too. A systematic review and meta-analysis from the National Osteoporosis Foundation found moderate evidence that higher protein intake has a small protective effect on bone mineral density in the lumbar spine, with about a 0.5% net improvement compared to lower protein intake. The effect on hip and total body bone density was less clear. Protein alone isn’t a bone-health strategy, but it works alongside calcium and vitamin D as part of the bigger picture.
Is Higher Protein Safe for Your Kidneys?
This is one of the most common concerns, and for women with healthy kidneys, the answer is reassuring. Higher-protein diets are not known to cause kidney problems in healthy people. The concern is real, however, for anyone with existing kidney disease. When kidney function is already reduced, the body struggles to clear the waste products generated by protein metabolism, and higher intake can accelerate decline.
Since kidney function naturally decreases somewhat with age, and many older adults have mild kidney impairment they aren’t aware of, it’s worth knowing your kidney status before significantly increasing protein intake. A simple blood test can measure your kidney filtration rate. For women with diabetes, which can silently affect kidney function, this is especially relevant.
What This Looks Like in a Day
For a 150-pound woman aiming for roughly 75 grams of protein daily, a realistic day might look like this: two eggs and a slice of whole-grain toast with a glass of milk at breakfast (about 22 grams), a lunch of lentil soup with a piece of cheese (about 25 grams), and a dinner of baked salmon with vegetables (about 28 grams). That reaches the target without supplements, large portions, or drastic dietary changes.
If your appetite is smaller, swapping regular yogurt for Greek yogurt, adding a spoonful of nut butter to oatmeal, or stirring protein powder into a smoothie can add 10 to 20 grams without adding much volume. Small, consistent upgrades tend to be more sustainable than overhauling your entire diet at once.