In short:
- Anabolic resistance means that in older age, muscle responds more weakly to protein and training than it does in younger years.
- The practical solution is to spread high-quality protein across the day and pair it with consistent strength training.
- If you have kidney disease, malnutrition, rapid weight loss or a chronic illness, your protein targets should be discussed with a doctor.
Anabolic resistance is one reason why the same amount of food may not support muscle mass and strength in older age the way it does in younger years. This doesn’t mean that protein “isn’t absorbed”; rather, muscle tissue needs a stronger and better-timed stimulus to switch on muscle protein synthesis. The WHO healthy aging framework emphasizes maintaining functional ability, which includes mobility and independence: https://www.who.int/news-room/questions-and-answers/item/healthy-ageing-and-functional-ability.
How does anabolic resistance work?
Anabolic resistance describes a situation in which skeletal muscle responds more weakly to amino acids and training. In practice, this can mean that a smaller amount of protein, which kick-starts muscle protein synthesis well in a younger person, doesn’t produce the same strong response in older age. Studies have shown that in older men, the myofibrillar protein synthesis response plateaued at approximately 0.40 g of protein per kilogram of body weight per meal, compared with approximately 0.24 g per kilogram in younger men (Moore, 2015).
It is important to distinguish between digestion and the muscle’s response. Protein is broken down into amino acids in the digestive tract and is still absorbed, but the amino acid signal reaching the muscle may be weaker. There are several reasons: lower physical activity, a background of low-grade inflammation, illness, changes in insulin sensitivity and lower muscle mass. Breen and Phillips describe it as an age-related change that can be partly influenced through nutrition and non-endurance strength training, or more precisely, training that builds muscle strength (Breen, 2011).
In the context of sarcopenia, the topic is especially practical. The EWGSOP2 approach puts muscle strength, not just muscle mass, front and center when assessing sarcopenia, because strength correlates better with functional outcomes (Cruz-Jentoft, 2019). So the goal is not just “more protein” but protein combined with training that gives the muscle a reason to use the amino acids.
How much protein do you need in older age?
The PROT-AGE study group recommends a general target of at least 1.0–1.2 g of protein per kilogram of body weight per day for people over 65, to support muscle mass and function (Bauer, 2013). In the case of acute or chronic illness, the same document often suggested a higher range of 1.2–1.5 g per kilogram of body weight per day, but such a target must take into account diagnoses, kidney function, energy intake and medications (Bauer, 2013).
If a person weighs 70 kg, 1.0–1.2 g per kilogram of body weight per day would mean approximately 70–84 g of protein per day (Bauer, 2013). This calculation is not a rule but a starting point. If body weight is very high or very low, or if there is edema, kidney disease or unintentional weight loss, it makes sense to seek help from a healthcare professional.
Protein quality matters too. Complete proteins provide all the essential amino acids, including L-leucine, which is associated with the muscle protein synthesis signal. That doesn’t mean plant-based protein is useless, but with a more plant-based menu, you need to monitor amounts, variety of sources and energy intake more deliberately. It also helps to think about the whole menu with Diet differences with age, because in older age appetite, energy expenditure, disease burden and recovery capacity all change at once.
Is it better to spread protein across the day?
Yes, for most people it makes sense to spread protein across the day so that every main meal has a clear protein component. Moore’s data suggest that in older age, a larger relative amount of protein may be needed in a single meal for the muscle protein synthesis response to reach its maximum (Moore, 2015). That is why a very small breakfast and a large portion of protein in the evening is often a worse solution than a more even distribution.
A practical plate can be simple: in the morning an egg, quark, Greek yogurt or a legume-based option; at lunch fish, chicken, meat, tofu, tempeh or legumes; in the evening again a clear protein component with vegetables and a carbohydrate source. If a sweet treat actually helps you reach your protein amount, a recipe like Flourless nut butter protein muffins can be a better choice than a random low-protein snack.
Protein powder is not mandatory. It is a convenient tool when regular food doesn’t get you to the target amount, your appetite is small, or you can’t manage to prepare a proper meal after training. Supplements for athletes gives a broader view, but in older age a supplement should remain an addition to the menu, not replace varied food.
What training helps against anabolic resistance?
Protein alone is not enough, because muscle needs a mechanical stimulus. The ACSM position stand on older adults emphasizes that regular physical activity does not stop biological aging, but it helps reduce the physiological consequences of a sedentary lifestyle and supports functional capacity (Chodzko-Zajko, 2009). Strength training is central here, because it gives the muscle a direct signal to maintain or build strength.
A good start is to train larger muscle groups at least 2 times a week, if your health status allows and the training load increases gradually (Chodzko-Zajko, 2009). Exercises can include a squat pattern, hip thrust or deadlift in a suitable variation, pressing, pulling, core stability and lower-leg or balance work. What matters is not building a complicated program but achieving repeated effort that the body can recover from.
If training is new to you, it’s worth starting with supervision and leaving something in reserve. Increasing the training load too sharply can cause joint or tendon problems that interrupt consistency. The principles of program design are explained in Building a training program: a complete guide. In older age, a program is especially valuable when the exercises are technically manageable, the training load is measurable and recovery is planned.
When should you be careful with protein?
Caution is needed if a person has chronic kidney disease, liver disease, active cancer treatment, severe heart failure, difficulty swallowing, unintentional weight loss or a recent hospital stay. In these situations, a general protein range is not suitable as an automatic prescription. An individual nutrition plan may be necessary, one that also takes energy, fluids, medications and blood tests into account.
Nor should protein be given a role it cannot fill. Protein does not treat sarcopenia on its own, does not replace strength training and does not make up for a persistent energy deficit. If a person eats too few calories, part of the protein intake may go toward covering energy needs instead of supporting muscle tissue. The best results come when protein, adequate energy, strength training, sleep and control of illness work together.
References
- Bauer (2013). 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. PMID: 23867520. DOI: 10.1016/j.jamda.2013.05.021
- Breen (2011). Skeletal muscle protein metabolism in the elderly: Interventions to counteract the anabolic resistance of ageing. Nutrition & Metabolism. PMID: 21975196. DOI: 10.1186/1743-7075-8-68
- Chodzko-Zajko (2009). American College of Sports Medicine position stand. Exercise and physical activity for older adults. Medicine & Science in Sports & Exercise. PMID: 19516148. DOI: 10.1249/MSS.0b013e3181a0c95c
- Cruz-Jentoft (2019). Sarcopenia: revised European consensus on definition and diagnosis. Age and Ageing. PMID: 30312372. DOI: 10.1093/ageing/afy169
- Moore (2015). Protein ingestion to stimulate myofibrillar protein synthesis requires greater relative protein intakes in healthy older versus younger men. The Journals of Gerontology: Series A. PMID: 25056502. DOI: 10.1093/gerona/glu103
Frequently asked questions
Does anabolic resistance mean that protein isn’t absorbed?
No. Protein is absorbed, but the muscle’s synthetic response to amino acids may be weaker, which makes adequate amount, quality and strength training more important.
Do you have to use protein powder when you’re older?
No. Protein powder is a convenient supplement when you can’t meet your needs with ordinary food or your appetite is small.
Is it better to eat protein all at once or spread out?
In most cases it is better to spread protein across the main meals of the day, because muscle needs repeated high-quality amino acid stimuli.
What is the most important type of training for reducing anabolic resistance?
The most direct stimulus is gradually progressive strength training that involves the larger muscle groups and can be done consistently.
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