Protein for active women after 40: do you really need a supplement?
- Dr. Caroline De Graeve
- 3 days ago
- 9 min read
You care about what you eat. You read labels. You try to stay strong, energized, and ahead of the curve.
And yet, when it comes to protein, the messaging is confusing. “Women don’t eat enough protein.” “Protein powders are unnecessary.” “You need more after menopause.” “Too much protein is bad for your kidneys.” So what is actually true?
Let’s step back from marketing and look at what the research shows — and what it means for your real life.
Protein after your run: clarity beyond the yogurt aisle
She heard on her favorite health podcast that women who run need extra protein.
So now, after every run, she adds protein-enriched yogurts to her cart. Sometimes a shake. Just to be safe.
She runs a business.
She runs her household.
She runs five to ten kilometers a few times a week.
She is not careless. She is proactive.
But is she solving a real physiological need, or responding to amplified messaging?
Let’s start where we should always start, with the body.
Human Recipe is educational, not clinical. If you have kidney disease, unexplained weight loss, or complex medical conditions, discuss protein targets with your healthcare provider.
Why we need protein at all
Protein provides amino acids. These are the building blocks for muscle tissue, enzymes, immune molecules, transport proteins, and structural proteins throughout the body.
Your body is in constant turnover. Even if you never enter a gym, you are continuously breaking down and rebuilding proteins.
That is why protein matters, but it also explains why panic rarely helps.
In most Western populations, true protein deficiency is uncommon.
The Estimated Average Requirement is about 0.66 g per kilogram of body weight per day.
The Recommended Dietary Allowance is 0.8 g per kilogram per day.
The RDA is designed to cover the needs of nearly all healthy adults.
For most healthy women, it already meets physiological requirements.
So the conversation is rarely about avoiding deficiency. It is usually about optimisation, and optimisation requires context.
The real post-run question
After endurance exercise, the body benefits from rehydration, carbohydrate replenishment, and some protein.
But “immediate protein or you lose muscle” is oversimplified.
Running primarily challenges your cardiovascular system and uses glycogen. It does increase muscle protein turnover slightly, but it does not provide the same muscle-building stimulus as resistance training. If you eat a balanced meal within a few hours, recovery is usually well supported.
If dinner is far away and you are hungry, a simple snack that combines carbohydrate and some protein is practical. This is physiology, not panic.
What this looks like in real life
If she finishes her run at 18:00 and eats dinner at 19:00, she likely needs nothing special beyond hydration.
If dinner is at 21:00 and she feels depleted, something simple makes sense.
Greek yogurt with fruit. Soy yogurt with berries. Milk and a banana. A slice of whole-grain bread with hummus. Cottage cheese and fruit.
Not because she is deficient. Because logistics matter.
Health that only works on a quiet weekend is not a strategy. It is a fantasy.
Running versus strength training
This is one of the most important distinctions, and it gets blurred online.
Running builds cardiovascular fitness, which is deeply protective.
Strength training is the more direct driver of muscle preservation and strength gains.
Protein supports both, but the body uses protein differently depending on the stimulus.
If your primary goal is to preserve muscle as you age, resistance training does more of the heavy lifting. Protein helps most when it supports that training and when total daily intake is adequate.
Since total intake matters more than perfection, the next logical question becomes: where does that protein actually come from?
Plant versus animal protein, what does it actually mean?
Before debating what is “best,” it helps to define the sources.
Animal proteins include eggs, fish, poultry, meat, and dairy products such as Greek yogurt, skyr, cottage cheese, and milk.
Plant proteins come from foods such as lentils, chickpeas, beans, tofu, tempeh, edamame, quinoa, nuts, seeds, and whole grains.
All plant foods contain essential amino acids. Some contain lower proportions of certain amino acids, but in a varied diet this is rarely limiting. Your body maintains an amino acid pool across the day. You do not need to engineer perfect combinations at every meal.
Animal proteins tend to have slightly higher digestibility and a higher proportion of certain essential amino acids, particularly leucine, which plays a role in stimulating muscle protein synthesis. Soy is the closest plant equivalent in amino acid profile and digestibility.
In real-life mixed diets with adequate total intake, the difference in “protein quality” is often overstated. Total intake and dietary pattern usually matter more than chasing perfection.
The distinction between plant and animal protein is not only about amino acids.
Animal protein sources often contain:
Vitamin B12 (absent from plant foods unless fortified)
Heme iron (more readily absorbed than plant iron)
Zinc and highly bioavailable calcium (in dairy)
Variable amounts of saturated fat, depending on the source
Plant protein sources typically contain:
Fiber (which animal foods lack)
Phytochemicals and polyphenols
Unsaturated fats
Non-heme iron (less readily absorbed, but adequate in varied diets)
This matters because health outcomes are shaped by whole dietary patterns, not isolated macronutrients.
A diet rich in legumes, nuts, whole grains, and vegetables tends to support cardiometabolic health partly because of fiber, micronutrients, and lower saturated fat intake. At the same time, moderate amounts of minimally processed animal products can fit within healthy dietary patterns, particularly when they replace ultra-processed foods rather than whole plant foods.
How much protein are we actually talking about?
For a 70 kg woman, the RDA corresponds to roughly 56 grams per day.
Many women reach that with three structured meals:
a yogurt at breakfast
legumes or fish at lunch
a protein source at dinner
For those who strength train regularly, a modest increase may be reasonable, but this usually requires adjustment, not overhaul.
So, do you need a supplement?
Usually, no.
A protein supplement is not superior to food. It is a logistics solution. It can be helpful when it increases your total daily intake, especially on days when breakfast is low-protein, appetite is reduced, travel disrupts routine, or training volume increases.
If it replaces protein you would have eaten anyway, it mainly buys convenience.
That is not a problem. It is just not a physiological breakthrough.
What about protein-enriched yogurts?
They are not harmful. They are not magical.
Most are simply dairy with added milk protein or whey to increase the gram count. If they help you meet your daily intake more consistently, fine. If you already reach your needs through food, they add little beyond cost and branding.
For endurance running alone, the proven health advantages come more strongly from cardiovascular conditioning, sleep, overall diet quality, and sustainable routines than from marginal increases in protein intake.
If muscle preservation is a goal, resistance training combined with adequate total protein has the strongest support.
And finally, what is creatine?
Creatine is not a protein.
It is a naturally occurring compound that the body synthesises from three amino acids:
arginine, glycine, and methionine. In muscle tissue, it is stored as phosphocreatine, where it helps regenerate ATP, the immediate energy source used during short, high-intensity efforts.
This explains why creatine is primarily relevant in the context of resistance training, sprinting, or repeated high-effort activity. By supporting rapid energy availability, it can increase training capacity slightly. Over time, that additional capacity may contribute to modest improvements in strength and lean mass.
Creatine does not replace dietary protein, and it does not build muscle independently. Muscle adaptation requires mechanical stimulus together with adequate total protein intake. Creatine can support the training process, but it cannot substitute for it.
There is also growing interest in creatine beyond muscle. Small amounts are stored in the brain, which is one of the body’s most energy-demanding organs. The brain relies heavily on ATP to maintain cellular function. From a mechanistic perspective, creatine may help buffer cellular energy in neurons, particularly during periods of high demand such as sleep deprivation, sustained cognitive effort, or age-related metabolic decline.
The human data in this area are still developing. Some studies suggest possible benefits for working memory, processing speed, mental fatigue, and resilience to sleep deprivation. Effects appear modest and context-dependent, and not all trials show consistent findings. This is an emerging field rather than a settled conclusion.
In women, the overall research base remains smaller than in men, though it is expanding. In midlife and older adults, creatine combined with resistance training appears to modestly enhance gains in strength and lean mass. In the absence of structured strength training, the musculoskeletal effects are limited.
Creatine is not required for general health. It is best understood as a performance adjunct with potential metabolic implications that are still being clarified. For women prioritising muscle preservation as they age, and who already engage in consistent resistance training, it may be a reasonable option to discuss with a healthcare professional.
Context determines its value far more than trend or enthusiasm.
A calm hierarchy that fits a full life
If you are a busy woman running a company and a household, the priorities are not exotic.
Start with adequate total protein, at least around the RDA as a baseline for most healthy women.
Build strength training into your week if muscle preservation matters to you.
Use practical snacks when meals are delayed.
Treat supplements as optional tools, not as foundations.
You do not need more products. You need clarity about what genuinely improves health outcomes, and a plan that fits your life on an ordinary Tuesday.
Protein matters. Context matters more.
If you enjoy reading at your own pace, you can explore more of my work here — calm, evidence-based, and free of wellness noise. → Human Recipe Library
Human Recipe is a science-driven wellness platform
that combines medical expertise with intelligent, future-focused tools, helping people turn
clinical insights into sustainable daily habits for a longer, healthier life.
Dr. Caroline De Graeve, MD, is a physician and founder of Human Recipe. She trained in medicine and completed advanced coursework in nutrition science, including Stanford University’s Nutrition Science program. Her work focuses on translating evidence-based lifestyle medicine into clear, practical guidance for women in midlife and beyond.
Scientific References
Protein Requirements & RDA
Institute of Medicine. (2005). Dietary reference intakes for energy, carbohydrate, fiber, fat, fatty acids, cholesterol, protein, and amino acids. National Academies Press.
FAO/WHO/UNU. (2007). Protein and amino acid requirements in human nutrition. WHO Press.
Protein Intake in Active Adults & Aging
Morton, R. W., Murphy, K. T., McKellar, S. R., et al. (2018). A systematic review, meta-analysis and meta-regression of protein supplementation on resistance training–induced gains in muscle mass and strength. British Journal of Sports Medicine, 52(6), 376–384.
Phillips, S. M., & Van Loon, L. J. C. (2011). Dietary protein for athletes: From requirements to metabolic advantage. Journal of Sports Sciences, 29(S1), S29–S38.
Moore, D. R., et al. (2009). Ingested protein dose response of muscle and albumin protein synthesis after resistance exercise. American Journal of Clinical Nutrition, 89(1), 161–168.
Paddon-Jones, D., & Rasmussen, B. B. (2009). Dietary protein recommendations and the prevention of sarcopenia. Current Opinion in Clinical Nutrition and Metabolic Care, 12(1), 86–90.
Endurance vs Resistance Training Adaptations
Hawley, J. A., et al. (2014). Integrative biology of exercise. Cell, 159(4), 738–749.
Phillips, S. M. (2014). A brief review of critical processes in exercise-induced muscular hypertrophy. Sports Medicine, 44(Suppl 1), S71–S77.
Nutrient Timing & “Anabolic Window”
Aragon, A. A., & Schoenfeld, B. J. (2013). Nutrient timing revisited: Is there a post-exercise anabolic window? Journal of the International Society of Sports Nutrition, 10(1), 5.
Schoenfeld, B. J., et al. (2013). The effect of protein timing on muscle strength and hypertrophy: A meta-analysis. JISSN, 10, 53.
Plant vs Animal Protein & Protein Quality
Mariotti, F., & Gardner, C. D. (2019). Dietary protein and amino acids in vegetarian diets. Nutrients, 11(11), 2661.
Young, V. R., & Pellett, P. L. (1994). Plant proteins in relation to human protein and amino acid nutrition. American Journal of Clinical Nutrition, 59(5), 1203S–1212S.
Wolfe, R. R., et al. (2016). Optimizing protein intake in adults: Interpretation and application of the recommended dietary allowance. American Journal of Clinical Nutrition, 104(3), 633–643.
Creatine: Muscle & Aging
Chilibeck, P. D., et al. (2017). Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: A meta-analysis. Open Access Journal of Sports Medicine, 8, 213–226.
Candow, D. G., et al. (2014). Creatine supplementation and aging musculoskeletal health. Journal of Nutrition in Gerontology and Geriatrics, 33(3), 253–270.
Forbes, S. C., et al. (2021). Creatine supplementation and aging: Current evidence and future directions. Nutrients, 13(6), 1917.
Creatine & Brain Function (Emerging)
Rae, C., et al. (2003). Oral creatine monohydrate supplementation improves brain performance: A double-blind, placebo-controlled study. Proceedings of the Royal Society B, 270(1529), 2147–2150.
Avgerinos, K. I., et al. (2018). Effects of creatine supplementation on cognitive function: A systematic review. Experimental Gerontology, 108, 166–173.
Ultra-Processed Foods Context (Protein Yogurt Section)
Monteiro, C. A., et al. (2019). Ultra-processed foods: What they are and how to identify them. BMJ, 365, l1949.
Srour, B., et al. (2019). Ultra-processed food intake and risk of cardiovascular disease. BMJ, 365, l1451.
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