Search for protein for runners over 50 and you will find confident single numbers: 1.6 g/kg here, 0.4 g/kg per meal there. Most come with no source and no caveats. Many also borrow findings from sedentary older adults or from young athletes and apply them to you.
The honest answer comes in layers, and each layer has limits. This guide walks through them, then turns them into a practical daily range, a per-meal plan and worked examples for 60, 70 and 80 kg runners.
Why 0.8 g/kg Is a Floor for Older Runners
The standard RDA is 0.8 g of protein per kg of body weight per day. A 2013 position paper from the PROT-AGE Study Group in JAMDA judged that figure too low for older people. The group recommends at least 1.0 to 1.2 g/kg/day for healthy older adults, and about 1.2 g/kg or more for those who exercise.
Two cautions apply. PROT-AGE was written for people over 65, and it draws on a mix of nitrogen-balance studies, cohort studies and small trials. The society also received a grant from Nestlé Nutrition to support the group’s meetings, which is worth knowing when you weigh the advice.
Anabolic resistance and the per-meal threshold
“Anabolic resistance” means older muscle responds less to a small dose of protein than younger muscle does. PROT-AGE suggests older people may need about 25 to 30 g of protein per meal, roughly 2.5 to 2.8 g of leucine, to reach that threshold.
A 2015 study by Moore and colleagues in the Journals of Gerontology tested this directly. Muscle protein synthesis in healthy older men levelled off at about 0.40 g/kg in one meal, versus about 0.24 g/kg in young men. The difference was borderline statistically (p = 0.055), the confidence interval was wide, and the men were not runners.
PROT-AGE also cites the Health ABC cohort. Older adults in the top fifth for protein intake lost about 40% less lean mass over 3 years than those in the bottom fifth. That is an association, not proof that protein caused the difference.
What Running Adds: The Endurance-Athlete Data
Running raises protein needs on top of age. In a 2016 PLOS ONE study, endurance-trained men did a 20 km run. Their estimated average requirement that day was 1.65 g/kg, and the recommended intake (upper 95% confidence limit) was 1.83 g/kg.
A 2025 review in Sports Medicine of this type of study concluded that endurance athletes need about 1.8 g/kg/day, roughly 50% more than sedentary adults. It suggested about 2.0 g/kg may be needed with intensive training combined with carbohydrate restriction or low energy availability.
The limits matter. The 2016 study had just 6 men with a mean age of 28, was short-term, and was partly funded by Ajinomoto. The 2025 review covers young athletes too. Neither tells us anything direct about people over 50.
The ISSN position stand on protein and exercise lands in a similar place for exercising adults generally: at least about 1.4 to 2.0 g/kg/day. It also reminds endurance athletes to prioritise enough carbohydrate.
Do Active Masters Runners Really Have Anabolic Resistance?
This is where the layers pull in different directions. A 2021 expert review of master athletes from the Gatorade Sports Science Institute argues there is little evidence that active masters athletes have the anabolic resistance seen in sedentary older adults. Its suggestion is to follow the targets developed for younger athletes.
That means 0.3 to 0.4 g/kg per meal, up to about 0.5 g/kg right after endurance exercise, across about four meals roughly four hours apart. The daily total would be about 1.5 to 1.8 g/kg.
Treat that as informed opinion, not a trial result. The author notes that master athletes are little studied, and the publisher is owned by PepsiCo, though it states the views are the author’s own. The review also cautions that master endurance athletes may not be protected from age-related muscle loss as well as master strength athletes. For more on how regular exercise relates to muscle aging, see our post on muscle aging in regular exercisers over 50.
Protein for Runners Over 50: A Practical Daily Range
Putting the layers together gives a sensible working range of about 1.2 to 1.8 g/kg/day. The bottom is the PROT-AGE advice for older people who exercise. The top is the endurance-athlete and masters-athlete evidence. This range is our synthesis of those sources, not a prescribed target.
- Toward 1.2 g/kg: easier weeks, shorter runs, or if you are unsure where to start.
- Around 1.5 g/kg: regular training with a mix of easy and harder runs.
- Toward 1.8 g/kg: long-run days and heavier training blocks.
| Body weight | 1.2 g/kg | 1.5 g/kg | 1.8 g/kg |
|---|---|---|---|
| 60 kg | 72 g | 90 g | 108 g |
| 70 kg | 84 g | 105 g | 126 g |
| 80 kg | 96 g | 120 g | 144 g |
Women after menopause need a note here. The masters-athlete review says there is no research in post-menopausal female master athletes. It recommends they follow the male recommendations, but that is reasoning rather than direct evidence. The 2025 review cites just one study in women: a 20 km run study in 7 young women.
Per-Meal Dose and Timing
Daily totals matter, but so does how you spread them. Aim for about 0.3 to 0.4 g/kg per meal across roughly four meals, spaced about four hours apart. PROT-AGE’s 25 to 30 g per meal fits this well for most runners.
| Body weight | Per meal (0.3-0.4 g/kg) | Right after a run (up to 0.5 g/kg) |
|---|---|---|
| 60 kg | 18-24 g | up to 30 g |
| 70 kg | 21-28 g | up to 35 g |
| 80 kg | 24-32 g | up to 40 g |
Even-spaced meals are not the only approach. PROT-AGE notes that some studies found benefit from “pulse” feeding, with most protein in one main meal, so the best distribution is not settled.
Protein after a run
PROT-AGE advises about 20 g or more after exercise, as muscle sensitivity to amino acids stays raised for hours afterwards. The masters-athlete review suggests up to about 0.5 g/kg after endurance exercise. A simple approach is to eat a protein-containing meal or snack within a few hours of finishing, alongside carbohydrate.
Fasted or low-carb training
The same masters review cites small studies in young men suggesting low-carbohydrate training may raise protein needs by about 10 to 15%. That could be covered by adding about 0.05 g/kg to each meal, which is roughly 3 to 4 g for a 60 to 80 kg runner. It also reports that time-restricted eating led to loss of both fat and lean mass in young endurance athletes over 8 weeks, so it advises older endurance athletes to prioritise balanced daily protein on most days. Our intermittent fasting article covers that topic in depth.
Food First, Supplements Second
PROT-AGE found no evidence that digestion and absorption of protein change significantly with ageing. It also says the evidence for leucine, HMB and similar supplements in older people is not strong enough for firm recommendations. Whey did better than casein or soy in some short-term studies in older men, but larger trials are needed.
In practice, powder is a convenience, not a requirement. Eggs, dairy, fish, poultry, tofu, beans and lentils can all get you to your per-meal target. Use a shake when a real meal is not practical.
Pair protein with strength work
A 2018 meta-analysis by Morton and colleagues in the British Journal of Sports Medicine looked at resistance-training trials. Protein supplementation increased strength and muscle size. Gains in fat-free mass stopped improving beyond a total intake of about 1.62 g/kg/day, though the confidence interval reached about 2.2 g/kg. Benefit was smaller with increasing age and larger with more training experience.
This concerns lifting, not running performance. Still, it supports pairing protein with strength training rather than relying on protein alone. If you are weighing protein alongside weight-loss medication, see our post on GLP-1 drugs and running.
What We Still Don’t Know
- Almost none of the running-specific data comes from people over 50. It comes mostly from young men.
- There are no studies in post-menopausal runners.
- Many studies are small, short-term, or funded partly by industry.
- The best distribution across the day is not settled.
- Higher protein is not shown to be “optimal” for health or performance. The 2016 authors said this is unclear.
When to Check With Your Doctor
PROT-AGE found little or no evidence that higher protein intakes damage the kidneys of healthy people, including older people. The exception is reduced kidney function. In the Nurses’ Health Study, women with mild kidney insufficiency who ate more protein, especially non-dairy animal protein, had a faster-than-expected decline in kidney function. That was observational data.
For severe chronic kidney disease (eGFR under 30, not on dialysis), PROT-AGE advises limiting protein to about 0.8 g/kg. Talk to your doctor before raising your protein intake if you have kidney disease, diabetes with kidney problems, or are unsure of your kidney function.
See a clinician promptly for chest pain, fainting, unusual breathlessness or sudden severe pain. These are not nutrition questions.
Frequently Asked Questions
How much protein do runners over 50 need per day?
A reasonable working range is about 1.2 to 1.8 g/kg/day. Older-adult guidance starts at 1.0 to 1.2 g/kg, and endurance-athlete data suggest about 1.8 g/kg on long-run days. That range is a synthesis, since no study has set a target for runners over 50 specifically.
Do older runners need more protein than younger runners?
Not necessarily. Sedentary older adults seem to need a higher dose per meal. A 2021 review argues active masters athletes can follow the targets set for younger athletes, because evidence of anabolic resistance in them is limited. Masters athletes are little studied, so this is not settled.
How much protein should I eat per meal and after a run?
Aim for about 0.3 to 0.4 g/kg per meal, which is roughly 20 to 30 g for most runners. After a run, PROT-AGE advises about 20 g or more. The masters review suggests up to about 0.5 g/kg after endurance exercise.
Do I need protein powder?
No. PROT-AGE found no evidence that protein digestion changes much with age, and it says evidence for leucine and HMB supplements is not yet strong enough for firm advice. Powder is a convenient way to hit a per-meal target, but food can do the same job.
Is high protein safe for older runners?
For healthy people, PROT-AGE found little or no evidence of kidney harm from higher intakes. People with reduced kidney function are the exception, and those with severe disease (eGFR under 30) may need to limit protein. Check with your doctor if you are unsure.
References
- Evidence-Based Recommendations for Optimal Dietary Protein Intake in Older People: A Position Paper From the PROT-AGE Study Group. Journal of the American Medical Directors Association (JAMDA), 2013.
- Protein ingestion to stimulate myofibrillar protein synthesis requires greater relative protein intakes in healthy older versus younger men. Journals of Gerontology Series A (Moore et al.), 2015.
- Protein Requirements Are Elevated in Endurance Athletes after Exercise as Determined by the Indicator Amino Acid Oxidation Method. PLOS ONE, 2016.
- Protein Nutrition for Endurance Athletes: A Metabolic Focus on Promoting Recovery and Training Adaptation. Sports Medicine, 2025.
- Protein Requirements of Master Athletes: Do They Need More Than Their Younger Contemporaries? (Sports Science Exchange #219). Gatorade Sports Science Institute, 2021.
- International Society of Sports Nutrition Position Stand: protein and exercise. Journal of the International Society of Sports Nutrition, 2017.
- A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine, 2018.