The 60-second version
Most adults lose 3 to 8 percent of their muscle mass per decade after age 30, and the rate accelerates after 60. This clinical loss of muscle, called sarcopenia, isn’t just about appearance — it’s a predictor of falls, hospitalization length, and loss of independence. Resistance training is the main driver of keeping muscle, and adequate protein — particularly its leucine content — appears to help older muscle respond. Because of "anabolic resistance," older adults may need more protein per meal than younger adults to get the same muscle-building response. Researchers have proposed a leucine threshold of roughly 2.5 to 3.0 g per meal for older adults, which usually takes 30 to 40 g of high-quality protein — about triple what’s in a typical North American breakfast.
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What sarcopenia is, briefly
Sarcopenia is the age-related loss of muscle mass and strength. The European Working Group on Sarcopenia (EWGSOP2) defines it by three criteria: low muscle strength, low muscle quantity or quality, and low physical performance EWGSOP2 2019. The proportion of people affected rises steeply in later life. The consequences are structural: reduced grip strength and falling rates rise in lockstep as quadriceps strength falls.
What "anabolic resistance" means
Younger muscle responds vigorously to a protein-containing meal. Older muscle responds more sluggishly. This is anabolic resistance: the same dose of protein produces a smaller muscle protein synthesis (MPS) response in a 70-year-old than in a 25-year-old. Consequently, older adults need more protein per meal to produce the same stimulus, not less. The conventional advice that "older adults need less food" is correct on total calories but almost exactly wrong on protein density.
The leucine threshold
Leucine is the branched-chain amino acid most closely linked to switching on the mTOR pathway for muscle synthesis. Short-term laboratory studies have been used to propose that younger adults need around 1.7 g of leucine per meal to maximise the response and older adults roughly 2.5 to 3.0 g per meal; these are estimates from muscle-synthesis measurements, not long-term outcome trials. This roughly maps onto protein serving size: a moderate 30 g serving of high-quality protein raised muscle protein synthesis by about 50% in both young and elderly adults alike, with a much larger 90 g serving adding no further benefit to either group Symons 2009 — in other words, once a meal clears that threshold, roughly 30 to 40 g of protein, piling on more doesn't buy extra muscle-building signal.
Protein targets and distribution
The PROT-AGE Study Group's evidence review recommends that older adults consume 1.0 to 1.2 g/kg of total daily protein — meaningfully above the standard RDA of 0.8 g/kg — to help offset age-related lean mass loss Bauer 2013. For a 70 kg adult, that works out to roughly 70 to 84 g of protein per day, which can be spread across 3 to 4 meals of 25 to 35 g each. If you have kidney disease or reduced kidney function, or follow a medically restricted diet, check with your doctor or a dietitian before raising your protein intake.
Hitting the threshold: 30g protein sources
| Source | Portion | Protein | Leucine |
|---|---|---|---|
| Greek yogurt (2%) | 1.5 cups | 28 g | 2.4 g |
| Whey protein isolate | 1 scoop (30 g) | 25 g | 2.7 g |
| Chicken breast | 130 g (4.5 oz) | 35 g | 2.7 g |
| Salmon | 130 g (4.5 oz) | 28 g | 2.2 g |
| Cottage cheese | 1.5 cups | 36 g | 3.5 g |
| Eggs | 5 large | 30 g | 2.5 g |
The breakfast lever
The biggest practical change for most older adults is breakfast. A typical North American breakfast — toast and coffee or a bowl of cereal — contains 5 to 12 g of protein. That is likely to fall well short of the proposed leucine threshold. Three fixes:
- Greek yogurt + berries. 1.5 cups of 2% Greek yogurt provides ~28 g of protein.
- Eggs. Four to five large eggs provide ~28 to 30 g. If you have been advised to limit dietary cholesterol, or have diabetes or heart disease, ask your doctor or dietitian how eggs fit your diet.
- Whey protein shake. One scoop in milk provides about 30 g and is the fastest option for those with low morning appetite.
The training multiplier
Extra protein on its own does little for muscle without a training stimulus; resistance training is the main driver, and adequate protein appears to help older muscle make the most of it. For older adults, 2 to 3 resistance training sessions per week focusing on compound patterns (sit-to-stand, hinge, push, pull) is a common recommendation for preserving strength and independence. If you are new to exercise, have a heart condition, or have had falls, talk to your doctor or a physiotherapist about a safe starting point.
Practical takeaways
- Know the benchmark: expert guidance for older adults suggests 1.0 to 1.2 g of protein per kg of body weight daily, up to 50% above the standard RDA. With kidney disease or a restricted diet, ask your doctor or dietitian first.
- Distribute protein across 3 to 4 meals. Around 25 to 35 g per meal is a practical way to reach the proposed leucine threshold.
- Prioritize the breakfast protein. Don’t let the first 8 hours of your day be a missed opportunity for muscle preservation.
- Pair nutrition with 2–3 resistance sessions weekly. Use the nutrition to convert the training stimulus into real muscle quality.
Frequently asked questions
Is too much protein hard on older kidneys?
In healthy older adults with normal kidney function, moderately higher protein intakes have not been shown to cause harm, although long-term data are limited. Kidney function often declines with age, so if you have kidney disease or reduced kidney function, talk to your doctor or dietitian before increasing protein.
Can I just take a leucine supplement?
For most healthy adults, whole protein foods are the better route. Whether a leucine or protein supplement makes sense during a hospital stay, after surgery, or on a restrictive diet is a question for your care team or a dietitian.
Is collagen useful for muscle?
No. Collagen is very low in leucine and is not an effective trigger for muscle protein synthesis. Claims about tendon and skin benefits rest on limited evidence, and it should not replace high-leucine proteins like whey, eggs, or meat in your muscle-preservation plan.
Is it ever too late to start?
No. Older adults, including people in their 80s and 90s, can still gain strength with appropriate resistance training and adequate protein. If you have health conditions, a history of falls, or are losing weight or strength without trying, see your doctor first and ask about supervised exercise.
References
Bauer 2013Bauer J, Biolo G, Cederholm T, et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J Am Med Dir Assoc. 2013;14(8):542-559. View source →Symons 2009Symons TB, Sheffield-Moore M, Wolfe RR, Paddon-Jones D. A moderate serving of high-quality protein maximally stimulates skeletal muscle protein synthesis in young and elderly subjects. J Am Diet Assoc. 2009;109(9):1582-1586. View source →EWGSOP2 2019Cruz-Jentoft AJ, Bahat G, Bauer J, et al. Sarcopenia: revised European consensus on definition and diagnosis. Age Ageing. 2019;48(1):16-31. View source →
