How Much Protein Does a 47-Year-Old Woman Need?

A 47-year-old woman needs at least 0.8 grams of protein per kilogram of body weight per day, which is the standard recommendation for all adults. But a growing body of research suggests that number is a bare minimum, not an ideal target, and that women in their mid-to-late forties have specific reasons to aim higher. For a woman weighing around 150 pounds (68 kg), the baseline translates to roughly 55 grams per day, yet many nutrition researchers now argue that something closer to 1.0 to 1.2 grams per kilogram, or even more, better supports the demands this particular stage of life places on muscle, bone, and metabolism.

Why the Standard Number Is Probably Too Low

The 0.8 grams per kilogram figure was established as the Recommended Dietary Allowance, the amount sufficient to prevent deficiency in the vast majority of healthy adults. It was never meant to represent the amount that optimizes health, preserves muscle, or supports an active lifestyle. A recent review in the American Journal of Lifestyle Medicine notes that many people benefit from protein intakes above the RDA, and that adequate protein supports preservation of lean mass through perimenopause and aging.¹ The distinction matters because meeting the RDA simply means you are unlikely to develop a protein deficiency disease. It does not mean your muscles, bones, and metabolic health are getting what they need to function well over the coming decades.

For a 47-year-old woman, the practical target that most current research supports falls in the range of 1.0 to 1.2 grams per kilogram of body weight daily, and women who exercise regularly or are trying to build or maintain muscle may benefit from going even a bit higher. Using our 150-pound example, that shifts the daily goal from roughly 55 grams up to about 68 to 82 grams. That difference, an extra chicken breast or a couple of servings of Greek yogurt, is not dramatic, but it can be meaningful over time.

What Happens to Muscle at 47

Age 47 sits right at a physiological inflection point. Data from a large community survey in Milan found that muscle strength begins to decline significantly after age 45 in both men and women, while measures of muscle size tend to hold relatively steady until about age 50 before they begin to slip.² So at 47, a woman is likely already experiencing some early loss of strength even if the mirror and the scale haven’t changed much. This is not about looking different. It is about the practical consequences of weaker muscles: harder time carrying groceries, reduced balance, higher injury risk from falls later in life.

The hormonal picture intensifies the issue. Menopause, and the perimenopausal years leading up to it, brings a gradual decline in estrogen and other sex hormones that directly affects how efficiently muscles repair and grow. Research published in The Obstetrician & Gynaecologist describes how these hormonal shifts impair mitochondrial health and muscle protein synthesis, the process by which your body uses the protein you eat to maintain and build muscle tissue.³ Over time, this leads to sarcopenia, which is the clinical term for age-related muscle wasting, and it carries real consequences for quality of life and independence.

The takeaway is that a 47-year-old woman’s body is becoming less efficient at using protein to maintain muscle. That inefficiency is one of the strongest arguments for eating more of it. The goal is not bodybuilding. It is giving a body that is getting worse at this particular job enough raw material to keep doing it adequately.

How to Distribute Protein Throughout the Day

Total daily protein matters, but how you spread it across meals appears to matter almost as much. Many people eat very little protein at breakfast and lunch and then load up at dinner. Research suggests this pattern is not ideal for muscle preservation. A review in Current Opinion in Clinical Nutrition & Metabolic Care found that reaching a protein threshold of roughly 30 grams per meal is a promising strategy for middle-aged and older adults who want to maintain muscle mass while controlling body fat.⁴

A separate study in Clinical Nutrition looked at this more closely and found that consuming between 30 and 45 grams of protein per meal, at least once or twice per day, produced the strongest association with leg lean mass and leg strength.⁵ The reasoning behind this has to do with how the body triggers muscle protein synthesis. Below a certain threshold of protein in a single sitting, the signal to build and repair muscle is weak. Above that threshold, the machinery kicks in more effectively. A 60-gram dinner and a 10-gram breakfast do not produce the same results as two 35-gram meals, even though the total is the same.

For a 47-year-old woman targeting around 80 grams of protein a day, a practical approach might look like three meals each containing 25 to 30 grams. That could be eggs with cheese at breakfast, a chicken salad at lunch, and fish with beans at dinner, with a high-protein snack like a handful of almonds or a small serving of cottage cheese if needed. The key shift for most people is moving protein out of the dinner-dominant pattern and into the morning and midday meals.

Does It Matter Whether Protein Comes From Plants or Animals?

This question generates a lot of debate, and the answer is more nuanced than either side tends to admit. A large systematic review and meta-analysis of 30 randomized controlled trials compared plant protein and animal protein head-to-head for their effects on muscle mass, strength, and physical performance. Across all studies, animal protein showed a small statistical advantage for muscle mass gains. But when the researchers looked at women specifically, that advantage vanished entirely: there was no difference between plant and animal protein for muscle mass in women.⁶

That does not mean protein sources are interchangeable in every respect. Animal proteins like meat, fish, eggs, and dairy tend to be “complete,” meaning they contain all essential amino acids in proportions the body can readily use. Most plant proteins are lower in one or more essential amino acids, particularly leucine, which is the amino acid most directly involved in triggering muscle protein synthesis. However, eating a variety of plant proteins over the course of a day, such as combining legumes with grains, can fill those gaps. If you eat a mixed diet that includes both animal and plant sources, the practical difference is likely negligible. If you eat a fully plant-based diet, paying attention to variety and total quantity becomes more important, but the meta-analysis data suggest this is entirely workable for women.

Protein and Resistance Training Work Together

Protein intake and exercise are not independent levers for muscle health. They interact, and the combination is substantially more effective than either one alone. A pilot study of healthy middle-aged women who did resistance training for 16 weeks found an interesting pattern: women who habitually ate less protein at breakfast but increased their breakfast protein intake during the training period saw better muscle gains.⁷ The study suggests that simply increasing protein at breakfast, particularly for women who normally eat very little in the morning, may be a practical way to get more out of a resistance training program.

This finding aligns with the meal-distribution research described earlier. If you are going to start lifting weights or doing bodyweight exercises, front-loading more protein into breakfast could be an easy win. Resistance training creates the stimulus for muscle growth, but the building material has to be available for the body to respond to that stimulus. A morning workout followed by a coffee and a piece of toast is a missed opportunity compared to one followed by a meal with 25 to 30 grams of protein.

For a 47-year-old woman, resistance training two to three times per week is one of the most evidence-backed interventions for preserving strength and bone density through the perimenopausal transition. Pairing it with adequate protein amplifies the benefit. Neither is optional if long-term muscle and bone health are priorities.

Is Higher Protein Intake Safe for Your Kidneys?

This is probably the most common concern people raise when the topic of eating more protein comes up, and it deserves a straightforward answer. In people with healthy kidneys, there is no strong evidence that a moderately higher protein intake causes kidney disease. A systematic review and meta-analysis published in PLoS ONE compared high-protein diets to normal or low-protein diets in people without chronic kidney disease. The high-protein groups did show increases in glomerular filtration rate, which is a measure of how hard the kidneys are working, as well as modest increases in serum urea and urinary calcium.⁸ The kidneys were doing more work, but these changes were within a range that did not indicate damage in otherwise healthy people.

The picture changes if kidney function is already compromised. A review in the Journal of the American Society of Nephrology explains that high protein intake can cause increased pressure inside the kidney’s filtering units, potentially leading to injury and proteinuria over time.⁹ For someone with existing chronic kidney disease or early signs of kidney impairment, a high-protein diet could accelerate the problem. This is why anyone with known kidney issues should talk to a doctor before significantly increasing protein intake. But for a healthy 47-year-old woman, moving from 0.8 to 1.0 or 1.2 grams per kilogram is well within the range that research considers safe.

The urinary calcium finding from the meta-analysis is also worth noting for women approaching menopause. Increased calcium loss through urine could theoretically affect bone density over time. If you are increasing protein intake substantially, making sure calcium intake is also adequate is a reasonable precaution. This does not mean protein is bad for bones. In fact, adequate protein supports bone health. It just means the two nutrients work in tandem, and neglecting one while boosting the other is not ideal.

How Aging Changes Protein Digestion

Even if you eat enough protein, your body’s ability to extract and use it changes as you get older. Research on aging and digestion points to several shifts that become relevant in midlife and beyond. A review in Biogerontology describes reduced secretion of gastric acid and digestive enzymes, which impairs how well protein is broken down in the stomach and small intestine, along with weakened intestinal motility that delays transit and reduces absorption efficiency.¹⁰

Interestingly, a separate review in Critical Reviews in Food Science and Nutrition found that stomach acidity itself may not change much with age, but gastric emptying is delayed, meaning food sits in the stomach longer before moving into the small intestine, and the pancreas produces fewer of the enzymes needed to finish the digestion job.¹¹ The two reviews do not perfectly agree on every detail, which reflects the fact that this is still an evolving area of research. But the general picture is consistent: your gut becomes less efficient at extracting amino acids from the protein you eat.

This has a practical implication that circles back to the question of how much protein to eat. If your body is absorbing a smaller percentage of the protein that passes through your digestive system, you need to eat more of it to get the same effective dose. It is another reason why the 0.8 grams per kilogram baseline, which was established using data from younger adults, may underestimate the needs of women in their late forties and beyond. Choosing easily digestible protein sources, like eggs, dairy, fish, and well-cooked legumes, and eating them in moderate portions spread across the day rather than in one large meal, may help compensate for some of this reduced digestive efficiency.

Protein’s Role in Skin and Collagen

While muscle preservation and metabolic health are the primary reasons to pay attention to protein intake at 47, there is a parallel conversation happening about skin. Collagen, the most abundant protein in the body, provides structural support to skin, tendons, joints, and bones. Collagen production naturally declines with age, and the drop accelerates around menopause due to falling estrogen levels. This is a major reason why skin loses firmness and elasticity during this period.

A randomized, double-blind trial found that daily intake of bioactive collagen peptides significantly improved dermal density, hydration, and skin barrier function compared to placebo after 12 weeks, and that these improvements persisted even after supplementation was stopped.¹² Dermal thickness also increased in the collagen group. These are modest but real effects, and they suggest that for women concerned about skin changes in their late forties, collagen-specific supplementation may offer benefits beyond what general protein intake provides.

It is worth being clear about what collagen supplements are and are not. They are hydrolyzed protein, broken down into small peptides that are easy to absorb. They are not a substitute for adequate total protein intake. Think of them as a specialized add-on. Getting enough total protein from whole foods remains the foundation; collagen peptides are a targeted extra for a specific concern. Whether they are worth the cost depends on how much you care about the particular outcomes they have been shown to influence, primarily skin hydration and elasticity rather than muscle mass.

What a Protein-Rich Diet Does for Broader Metabolic Health

Beyond muscle and skin, higher-protein diets have been studied for their effects on the metabolic changes that tend to cluster around midlife in women. A study of obese postmenopausal women eating a higher-protein, Paleolithic-style diet found significant improvements across a range of metabolic markers: reductions in BMI, waist circumference, fasting glucose, cholesterol, triglycerides, and blood pressure, alongside a roughly 25 percent drop in calorie intake.¹³ The study was specifically about a dietary pattern, not protein in isolation, so it is hard to separate the protein effect from the overall diet composition. But it does suggest that in the context of a whole-foods diet, a higher protein proportion aligns with favorable metabolic outcomes in this population.

Protein also has a well-documented effect on satiety. Gram for gram, it keeps you feeling full longer than carbohydrates or fat. For a 47-year-old woman navigating the metabolic slowdown and shifting body composition that often accompany perimenopause, the appetite-regulating effect of protein may be as valuable as its muscle-preserving properties. Eating more protein at each meal can reduce snacking and overall calorie intake without requiring conscious restriction, making it one of the more sustainable dietary adjustments for weight management during this transition.

Protein and the Gut Microbiome

One area that gets less attention in the protein conversation is its effect on gut bacteria. A systematic review published in Nutrients examined how dietary protein content and processing affect the gut microbiome. In animal studies, high-protein diets shifted the balance of gut bacteria, increasing certain groups like Bacteroidetes while decreasing others like Firmicutes.¹⁴ Whether these shifts are beneficial, harmful, or neutral is still an open question, and mouse studies do not translate directly to humans.

What seems to matter more than total protein amount is the source. Highly processed protein sources, like certain protein bars and heavily processed meats, may have different gut effects than whole-food sources like fish, eggs, legumes, and fermented dairy. For a woman at 47 who is increasing her protein intake, the safest bet from a gut-health perspective is to favor minimally processed, fiber-rich options. Legumes are particularly useful here because they deliver both protein and the prebiotic fiber that feeds beneficial gut bacteria. Pairing a higher-protein diet with plenty of vegetables, fruits, and whole grains helps ensure the gut microbiome is not collateral damage in the pursuit of better muscle health.