Ageing well isn't luck — it's physiology. And adequate protein is one of the most powerful and underestimated levers for maintaining strength, independence, and quality of life over time.
There's a prevailing idea that losing strength and muscle mass with age is inevitable. That it's "natural." That it's part of the process. Science tells a different story: sarcopenia — the progressive loss of muscle mass and function associated with ageing — is modifiable. Diet, exercise, and, in particular, adequate protein intake play a documented role in its prevention and attenuation. It's not about having the body of a 25-year-old athlete. It's about maintaining the ability to live well, with strength and independence, for decades.
1. Sarcopenia: what happens to muscle with age
Skeletal muscle accounts for about 40% of total body mass in a healthy adult. It is the largest metabolically active organ in the body — responsible for movement, glucose regulation, amino acid storage, and heat production. But it is also the tissue most lost with ageing, a process called sarcopenia.
Sarcopenia is not just about aesthetics. Muscle mass loss is directly associated with a higher risk of falls and fractures, reduced functional capacity, insulin resistance, increased all-cause mortality, and generally poorer quality of life. It is, in the words of McMaster University researcher Stuart Phillips, "the most underestimated chronic disease in the world."
The process begins earlier than most people imagine. From 30–35 years old, muscle protein synthesis starts to become less efficient in response to the same dietary and exercise stimuli. After 50, the rate of muscle loss accelerates significantly. But — and this is the critical point — the speed and severity of this process are strongly influenced by choices within anyone's reach.
A review published in the Journal of Cachexia, Sarcopenia and Muscle (Cruz-Jentoft et al., 2019) — the European consensus on sarcopenia (EWGSOP2) — defined sarcopenia as a syndrome characterized by low muscle strength, low muscle quantity/quality, and low physical performance. The authors identified inadequate protein intake as one of the main modifiable risk factors, alongside physical inactivity and chronic diseases.
2. Anabolic resistance: why muscle needs more protein with age
One of the most well-documented mechanisms behind sarcopenia is anabolic resistance — the reduction in muscle sensitivity to stimulation by protein and exercise that progressively occurs with ageing. In practical terms: to produce the same amount of new muscle protein, a 65-year-old adult needs more amino acids than a 25-year-old adult in response to the same meal.
This phenomenon has two direct implications. First: protein recommendations for older adults are significantly higher than those for the general population. Second: the distribution of protein throughout the day matters even more — aged muscle responds better to moderate and frequent doses (25–35g per meal) than to large doses concentrated in a single meal.
A study published in the American Journal of Clinical Nutrition (Pennings et al., 2012) showed that, in older adults, post-prandial muscle protein synthesis is significantly lower than in young adults for the same protein dose. The authors concluded that higher doses of protein per meal (≥35g of high-quality protein) are necessary to overcome anabolic resistance and achieve muscle protein synthesis rates comparable to those of young adults.
3. How much, when, and what type: the three dimensions of protein for muscle longevity
How much — recommendations for older adults
| Profile | Recommended Intake | Equivalency (70kg) | Source |
|---|---|---|---|
| General adult (18–64 years) | 0.8g / kg / day | ~56g / day | EFSA / WHO |
| Active adult (18–64 years) | 1.2–1.6g / kg / day | 84–112g / day | ISSN 2017 |
| Adult ≥ 65 years (healthy) | 1.0–1.2g / kg / day | 70–84g / day | PROT-AGE 2013 |
| Adult ≥ 65 years (active / with exercise) | 1.2–1.6g / kg / day | 84–112g / day | PROT-AGE / ESPEN |
| Adult ≥ 65 years (acute or chronic illness) | 1.2–2.0g / kg / day | 84–140g / day | ESPEN 2018 |
In practice: Most adults over 60 consume significantly less protein than recommended — often below 0.8g/kg/day. Increasing intake to 1.0–1.2g/kg/day, with quality protein distributed across meals, is the nutritional intervention with the greatest documented impact on sarcopenia prevention.
When — timing and distribution
The distribution of protein throughout the day is particularly important for older adults. Intervention studies show that distributing protein intake across 3–4 meals with 25–35g of quality protein each is significantly more effective than concentrating the same amount in one or two meals.
Breakfast is often the most protein-deficient meal — a particularly relevant issue for older adults, who tend to have a reduced morning appetite. Including quality protein at breakfast is probably the change with the greatest individual impact on total daily protein intake.
What type — protein quality matters more with age
Not all proteins have the same effect on muscle protein synthesis. The most determining factor is the leucine content — the amino acid that acts as the "switch" for the mTOR pathway, the main regulator of muscle protein synthesis. In older adults with anabolic resistance, the leucine threshold to activate muscle protein synthesis is higher, making the quality of the protein source even more critical.
- ✓ Egg protein — DIAAS 1.13, high leucine content (8.8g/100g protein). Maximum quality reference, highly digestible, and with a complete essential amino acid profile.
- ✓ Insect protein — DIAAS ~1.0–1.1, complete amino acid profile, and high digestibility. Sustainable alternative with quality comparable to conventional animal sources.
- ✓ Combined legumes — individually incomplete in some amino acids, but when combined with whole grains throughout the day, they form a complete profile. A good option for diversity of sources.
- ✓ Protein oats — not a primary protein source, but as a breakfast base combined with other sources, it contributes to daily distribution. Beta-glucans also support metabolic health, which is relevant in aging.
4. Protein without exercise: half the equation
Adequate protein is necessary — but not sufficient. The mechanical stimulus of resistance exercise (weight training, bodyweight exercises, elastic bands) is the indispensable co-factor for the available protein to be effectively used in the synthesis of new muscle tissue. Without mechanical stimulus, additional protein is simply metabolized as energy.
The combination of protein + resistance exercise has been shown, in multiple clinical trials, to be the most effective intervention in delaying and partially reversing sarcopenia — superior to either alone. For older adults who have never strength trained, the good news is that aging muscle still responds to training — the rate of improvement can be surprisingly significant even when training begins after 60 or 70 years of age.
EFSA has formally approved the claim that "protein contributes to the growth and maintenance of muscle mass" and that this effect occurs "in combination with resistance exercise". This is one of the health claims best supported by evidence in European regulation. The minimum dose for benefit is 12% of total calories in the form of protein. (EU Regulation No. 432/2012)
5. Beyond muscle: what else is at stake
Adequate muscle mass is not just a matter of physical strength. Its systemic effects on aging are much broader than most people realize.
Skeletal muscle is the main glucose-consuming tissue — responsible for 70–80% of postprandial glucose uptake. Greater muscle mass means a greater capacity to regulate blood glucose, a lower risk of type 2 diabetes, and a better insulin response throughout aging.
Muscle contraction exerts mechanical forces on the bone that stimulate bone remodeling and mineralization. Adequate muscle mass is directly associated with higher bone mineral density and a lower risk of osteoporosis. Protein supports both tissues simultaneously — muscle and bone.
Muscle produces myokines — signaling proteins released during muscle contraction — which have documented neuroprotective effects. BDNF (brain-derived neurotrophic factor), produced in part in response to muscle exercise, is associated with a lower risk of cognitive decline and dementia.
Muscle functions as a reservoir of amino acids that the body mobilizes during periods of physiological stress (illnesses, surgeries, infections). Adults with greater muscle mass have a greater capacity for immune response and faster recovery from acute illness episodes — which partly explains why sarcopenia is associated with higher hospital mortality.
Muscle is metabolically more active than adipose tissue — it consumes more energy at rest. The loss of muscle mass with age reduces basal metabolism, which contributes to fat gain even without a significant change in caloric intake. Maintaining muscle mass is, in part, maintaining an efficient metabolism.
6. How to reach the recommended values — an example day
Achieving 1.0–1.2g of protein per kg of body weight does not require shakes or complex protocols. It requires structure and the right choices at each meal. Here's an example for a 70kg adult (goal: ~80–85g of protein per day):
Note: The values in the plan above are estimates and vary with the brands, quantities, and additions chosen. The goal is not to count grams to the decimal — it is to ensure that quality protein is present at each main meal, with a relatively even distribution throughout the day.
The protein your muscle needs, in a format that fits your routine
CORIAL products were developed to make it easy to reach recommended protein values — with quality protein, fiber, and no artificial sweeteners. The MAX Performance pack brings together a functional drink, protein oats, and pancakes — the basis of a muscular longevity routine.
Explore the CORIAL range7. The most common myths about protein and aging
- ✕ "Too much protein overloads the kidneys." — In healthy adults, evidence does not support this concern for intakes up to 2g/kg/day. Protein restriction for renal protection applies to people with pre-existing and diagnosed kidney disease — not to the general population. (Martin et al., Nutrition & Metabolism 2005)
- ✕ "I'm over 60, it's too late to build muscle." — Muscle maintains plasticity throughout life. Intervention studies in adults over 70 and 80 have shown significant gains in muscle mass and strength with resistance training combined with adequate protein — even in previously sedentary populations.
- ✕ "I don't exercise, so I don't need more protein." — Sedentary older adults need more protein than sedentary young adults, precisely because of anabolic resistance. Protein also serves to maintain all protein tissues in the body — immunity, enzymes, neurotransmitters — regardless of exercise.
- ✕ "Protein shakes are the best way to increase intake." — Protein from real foods has the same effect on muscle protein synthesis as protein from supplements, when the amino acid profile is equivalent. The advantage of real foods is the complete nutritional matrix — fiber, vitamins, minerals — that isolated supplements do not provide.
- ✕ "Sarcopenia is genetic — I can't do anything about it." — Genetics influence the rate of progression, but do not determine the outcome. Modifiable factors — diet, exercise, sleep quality, absence of smoking — have a much greater impact than the genetic component in most cases of sarcopenia.
The protein intake recommendations presented in this article are based on international scientific consensus (PROT-AGE, ESPEN, EFSA). People with kidney, liver disease, or other chronic conditions should consult a doctor or nutritionist before significantly altering protein intake. The values presented are general guidelines for healthy populations — they do not replace individualized clinical advice.
Conclusion: muscle as a long-term investment
Muscle mass is not just for gym-goers or those seeking a specific physique. It's the tissue that allows you to climb stairs, carry groceries, recover from illness, maintain balance, regulate blood glucose, and have energy for what matters. Losing it progressively — due to inadequate protein intake, sedentary lifestyle, or both — is a silent process with profound consequences for quality of life.
The good news is that the tools to stop this process are within reach of anyone: quality protein distributed throughout meals, regular resistance exercise, and food choices that make all of this simple and sustainable. Aging well is not a matter of luck. It's a matter of protein — and the decisions you make three times a day.
References
- Cruz-Jentoft AJ, Bahat G, Bauer J, et al. Sarcopenia: revised European consensus on definition and diagnosis. Age and Ageing, 2019; 48(1):16–31. DOI: 10.1093/ageing/afy169
- Bauer J, Biolo G, Cederholm T, et al. (PROT-AGE Study Group). 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, 2013; 14(8):542–559. DOI: 10.1016/j.jamda.2013.05.021
- Pennings B, Groen B, de Lange A, et al. Amino acid absorption and subsequent muscle protein accretion following graded intakes of whey protein in elderly men. American Journal of Physiology, 2012; 302(8):E992–E999. DOI: 10.1152/ajpendo.00517.2011
- Morton RW, Murphy KT, McKellar SR, et al. 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; 52(6):376–384. DOI: 10.1136/bjsports-2017-097608
- Stokes T, Hector AJ, Morton RW, McGlory C, Phillips SM. Recent Perspectives Regarding the Role of Dietary Protein for the Promotion of Muscle Hypertrophy with Resistance Exercise Training. Nutrients, 2018; 10(2):180. DOI: 10.3390/nu10020180
- Martin WF, Armstrong LE, Rodriguez NR. Dietary protein intake and renal function. Nutrition & Metabolism, 2005; 2:25. DOI: 10.1186/1743-7075-2-25
- EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA). Dietary Reference Values for protein. EFSA Journal, 2012; 10(2):2557. DOI: 10.2903/j.efsa.2012.2557
- Regulation (EU) No 432/2012 of the Commission establishing a list of permitted health claims made on foods. Official Journal of the European Union, L 136, 25.5.2012. EUR-Lex