Sarcopenia — the progressive loss of muscle mass and strength with aging — is one of the most consequential health changes of later life. It’s associated with falls, fractures, loss of independence, and increased mortality. Yet it’s also significantly influenced by diet, particularly protein intake, making it one of the most actionable aging-related health concerns.
The anabolic resistance problem
Younger adults can maintain muscle effectively on moderate protein intake. After age 60, the muscle-building response to protein becomes less efficient — a phenomenon called anabolic resistance. The same protein dose that would stimulate muscle protein synthesis in a 30-year-old produces a smaller response in a 70-year-old. The solution isn’t to give up; it’s to eat more protein and spread it more evenly across meals.
How much protein seniors actually need
Current evidence strongly supports a protein target of 1.2–1.6g per kilogram of body weight per day for adults over 60. For a 70kg (154 lb) person, that’s 84–112 grams of protein daily — meaningfully more than the standard 0.8g/kg recommendation. Research also shows that distributing protein across three meals (rather than concentrating it at dinner) maximizes muscle protein synthesis throughout the day.
The leucine threshold
Leucine is the branched-chain amino acid that most potently stimulates muscle protein synthesis. Older adults appear to have a higher leucine threshold to trigger this response — meaning each meal needs to contain at least 2.5–3g of leucine. This is approximately the amount found in 30–40g of complete protein from animal sources (eggs, dairy, meat, fish). Plant-based eaters may need to consume more total protein to reach equivalent leucine levels, or consider leucine-rich plant foods like edamame and tofu.
Bone density and the calcium-protein link
Protein and calcium work synergistically for bone health. Protein stimulates IGF-1 (insulin-like growth factor 1), which promotes bone formation, while calcium provides the mineral substrate. Despite old concerns that protein leaches calcium from bone, current evidence shows that higher protein intake is associated with better bone density when calcium intake is adequate. This makes protein-calcium pairing — yogurt, milk, sardines with bones, edamame — a particularly effective strategy for seniors.
The practical approach
Aim for 25–40g of protein at each major meal. Breakfast might be two eggs with Greek yogurt; lunch, canned salmon on whole grain crackers with cottage cheese; dinner, grilled chicken or tofu with legumes. Protein-rich snacks like cheese, hard-boiled eggs, or edamame can fill gaps. Combined with any form of resistance exercise — even light strength training or resistance bands — adequate protein intake is the most effective known strategy against age-related muscle loss.