How Much Protein Should a 57-Year-Old Woman Eat?

A 57-year-old woman likely needs somewhere between 1.0 and 1.2 grams of protein per kilogram of body weight each day, and possibly more if she exercises regularly. That range comes from expert panels and newer metabolic research, and it sits well above the long-standing U.S. recommendation of 0.8 grams per kilogram, which many researchers now consider inadequate for people in midlife and beyond. The gap between what official guidelines say and what the evidence supports is one of the more interesting disagreements in nutrition science right now, and understanding it can change how you plan your meals.

Why the Standard Recommendation Falls Short

The U.S. Recommended Dietary Allowance for protein is 0.8 grams per kilogram of body weight per day for all adults, regardless of age. That number was designed to prevent deficiency in the general population, but it was not optimized for preserving muscle, bone, or metabolic health as people get older. An international expert panel reviewed the evidence and recommended that adults aged 65 and older eat 1.0 to 1.2 grams per kilogram daily, with even higher intakes for those who are physically active.¹

At 57, you are not yet in that 65-plus bracket, but the biological changes that drive higher protein needs do not wait for a birthday. A study using more precise metabolic techniques to measure actual protein requirements in older women found that their average requirement was about 0.85 grams per kilogram per day, roughly 29% higher than the standard estimate used to set the current RDA.² That study looked at women in their eighties, but the underlying principle, that traditional methods underestimated how much protein older bodies actually need, applies earlier than most guidelines acknowledge.

For a 57-year-old woman weighing around 70 kilograms (about 154 pounds), the difference is meaningful. The RDA would suggest roughly 56 grams of protein per day. The expert panel’s range would put her at 70 to 84 grams, and active women might aim even higher. For a woman weighing 80 kilograms (about 176 pounds), those numbers scale up to 64 grams under the RDA versus 80 to 96 grams under the updated recommendation.

What Menopause Does to Protein Needs

Most women at 57 are postmenopausal or in late perimenopause, and this matters for protein in a specific way. The decline in estrogen that comes with menopause affects how efficiently the body builds muscle. A review of human studies on menopause and muscle protein turnover found that the muscle-building response to exercise and to eating protein may be blunted in older women.³ In practical terms, your muscles become less responsive to the signals that should trigger repair and growth. You eat the same amount of protein, do the same workout, and get less out of it.

This blunted response is one reason researchers keep pushing the recommended intake upward for midlife and older women. If your body is less efficient at using each gram of protein, you need more grams to get the same result. It is not that your muscles have stopped responding entirely. They just need a louder signal, and more protein at each meal is part of that signal.

How Aging Changes Protein Digestion

The issue is not just about how your muscles respond once amino acids arrive. Getting those amino acids from your plate into your bloodstream becomes less efficient with age. A review of age-related changes in the digestive system found that older adults produce fewer digestive enzymes from the pancreas, experience delayed gastric emptying, and show decreased absorption of amino acids into the bloodstream after meals.⁴ Another review noted reduced function of amino acid transporters in both the intestines and the muscles, further limiting how much of the protein you eat actually reaches the tissues that need it.⁵

Interestingly, the decline in gastric digestion itself may not be the main bottleneck. Research using detailed analysis of protein breakdown in the stomach found that while pepsin levels dropped with age, overall protein digestion was not dramatically affected at that stage.⁶ The bigger problems happen downstream: more of the amino acids get used up by the gut and liver before they ever reach your muscles, and the transporters that move amino acids into muscle cells work less effectively. The net effect is that you absorb less usable protein from the same meal than you did at 30.

Spreading Protein Across Meals

A common piece of advice is to spread your protein evenly across breakfast, lunch, and dinner rather than loading it all into one meal. The logic makes sense on paper: if your muscles can only process so much protein at once, giving them repeated doses throughout the day should be more efficient than dumping it all at dinner. And there is some observational support for this. A large longitudinal study of older adults found that people who distributed protein more evenly across meals had greater muscle strength, though it did not prevent the age-related decline in physical function over three years.⁷

When researchers have tested this more rigorously in controlled trials, though, the picture gets murkier. A randomized trial in healthy older adults found no difference in muscle protein synthesis between an even and a skewed distribution pattern, as long as total daily intake was sufficient.⁸ Another trial found that even distribution led to better amino acid absorption rates and a more favorable whole-body protein balance after breakfast and lunch, but actual muscle protein synthesis rates were the same between groups.⁹

The takeaway is that total daily protein matters more than perfect distribution. That said, if you currently eat a tiny breakfast with almost no protein and a huge steak at dinner, you are probably leaving some benefit on the table. Aiming for at least 25 to 30 grams of protein at each meal is a reasonable practical target, and it solves the distribution question without requiring you to obsess over it.

A Pre-Sleep Protein Trick Worth Knowing

One timing strategy does have consistent support: eating protein before bed. Research has shown that protein consumed before sleep is effectively digested and absorbed overnight, and it increases muscle protein synthesis during sleep.¹⁰ For someone who exercises, this gives the body an extended window of recovery during the hours it would otherwise go without fuel. A glass of milk, a serving of cottage cheese, or a small protein shake before bed is an easy way to add this into your routine without rearranging your main meals.

Protein and Exercise Work Together

Protein recommendations for midlife women make the most sense when combined with resistance training. The two are genuinely synergistic, not just additive. A study of postmenopausal women found that those who consumed protein-containing supplements alongside strength training gained lean body mass over 24 weeks, while those who trained without the extra protein did not. The supplement group also saw improvements in bone mineral density at the femoral neck, a critical site for fractures.¹¹

A meta-analysis focused specifically on whey protein supplementation in postmenopausal women found that when combined with resistance training, whey had a meaningful positive effect on arm strength and lower-limb lean mass.¹² The key word there is “combined.” Protein without exercise, or exercise without adequate protein, gives a weaker result than the two together. If you are going to make the effort to hit higher protein targets, adding resistance training two or three times a week is how you get the full return on that investment.

One thing that has not shown clear added benefit is isolated branched-chain amino acid supplements. A study of postmenopausal women doing resistance training found that both the supplement group and the placebo group gained muscle mass and strength, with no meaningful difference between them.¹³ If you are already eating enough total protein from whole foods, spending extra money on BCAA pills or powders is unlikely to help.

The Weight Loss Complication

If you are trying to lose weight at 57, the protein question gets more interesting and a bit trickier. Higher protein intake during calorie restriction is widely recommended because it helps preserve muscle mass. A study of postmenopausal women with obesity confirmed this: those eating 1.2 grams of protein per kilogram daily during weight loss retained about 45% more lean tissue than those eating 0.8 grams per kilogram.¹⁴

But that same study found an unexpected downside. The higher-protein group did not experience the improvement in insulin sensitivity that normally accompanies weight loss. The lower-protein group, eating the standard 0.8 grams per kilogram, lost more muscle but gained better blood sugar regulation. This is a genuine tradeoff, not a reason to avoid protein, but a reason to be aware that “more is always better” is too simple a framing. For postmenopausal women with obesity or insulin resistance, the sweet spot may require attention to both muscle preservation and metabolic health, and working with a dietitian could be worthwhile.

Bone density adds another layer. Research on postmenopausal women found that higher-protein diets during weight loss were associated with slightly greater bone mineral density loss compared to normal-protein diets.¹⁵ The losses were small but detectable, and they were more pronounced with animal protein sources. This does not mean high protein causes osteoporosis. It means that during active weight loss, the combination of calorie restriction and high protein may stress the skeleton slightly, and making sure you get enough calcium and vitamin D during that period is especially important.

Animal Versus Plant Protein

For building muscle, animal proteins like dairy, eggs, meat, and fish have a clear edge per gram. They are more digestible, contain more of the essential amino acids that drive muscle building (especially leucine), and trigger a stronger muscle protein synthesis response than plant proteins.¹⁶ Plant proteins tend to be lower in leucine, lower in sulfur amino acids or lysine, and less efficiently directed toward muscle repair.

But the long-term health picture favors a mix. Large prospective studies have consistently found that higher plant protein intake is associated with lower all-cause mortality and lower cardiovascular death risk, while higher animal protein intake shows a weak association with higher mortality.¹⁷ Substituting some animal protein with plant protein has been linked to lower risk of death from cardiovascular disease and dementia.¹⁸ Another study found that plant protein was associated with a meaningfully lower mortality risk even after adjusting for fruit and vegetable intake.¹⁹

The practical solution is not to choose one camp over the other. Eating a variety of protein sources, with a deliberate effort to include legumes, nuts, seeds, and soy alongside animal sources, gives you the muscle-building efficiency of animal protein and the long-term health benefits of plant protein. If you eat entirely plant-based, you can still meet your needs, but you will need to eat somewhat more total protein to compensate for the lower digestibility and amino acid profile. Research modeling plant-based diets for athletes found that well-planned plant diets can meet leucine thresholds for muscle building, but they require deliberate food choices and typically higher total protein volume.²⁰

Will More Protein Hurt Your Kidneys?

This is the concern that stops a lot of people from increasing their intake, and it is largely unfounded for women with healthy kidneys. The worry comes from the fact that the kidneys filter the byproducts of protein metabolism, so more protein means more work for the kidneys. In people who already have chronic kidney disease, high protein intake can accelerate the decline. But in the general healthy population, the relationship is different. A large population-based study found that higher protein intake was associated with higher kidney filtration rate across the normal range, with the relationship flattening out at both the lowest and highest protein intakes.²¹ In other words, the kidneys adapt to handle more protein, and there is no evidence that intakes in the 1.0 to 1.5 grams-per-kilogram range damage healthy kidneys.

One thing that does show up in studies is that high-protein diets, particularly those heavy in animal protein, increase calcium excretion in the urine. Animal research has confirmed that high casein diets lead to higher urinary calcium and conditions that theoretically favor kidney stone formation.²² If you have a history of kidney stones, this is worth discussing with your doctor. For everyone else, adequate fluid intake and a diet that includes fruits and vegetables (which provide citrate, a natural stone inhibitor) largely mitigates this concern.

Actually Hitting Your Target

Knowing you should eat more protein and actually doing it are different challenges. Many women in midlife eat well below even the standard RDA, and breakfast is usually the weakest meal. A study of middle-aged women found that with a specific per-meal protein prescription and nutrition education, participants increased their intake from about 0.8 to 0.9 grams per kilogram up to about 1.2 to 1.4 grams per kilogram over the study period. Women who received additional diet coaching were more likely to hit their breakfast protein targets, with 72% reaching the goal versus only 25% in the non-coached group.²³

Breakfast is where most people have the largest gap between what they eat and what they need. A typical breakfast of toast with jam, or cereal with a splash of milk, provides maybe 5 to 10 grams of protein. Swapping that for eggs with cheese, Greek yogurt with nuts, or a smoothie with protein powder can get you to 25 to 30 grams without much effort. Lunch tends to be easier to fix with leftovers, canned fish, or a bean-heavy salad. Dinner is where most women already eat the majority of their protein, so it often needs only minor adjustments.

If tracking grams feels tedious, a simpler rule of thumb works well: make sure every meal includes a palm-sized portion of a protein-rich food, and include a protein source in at least one snack. That approach, without any counting, will get most women of average size into the 1.0 to 1.2 grams-per-kilogram range. Protein powders are a useful tool, not a requirement. They shine most when added to foods you are already eating, like stirring whey into oatmeal or blending plant protein into a morning smoothie, rather than as stand-alone shakes that replace real meals.