Does an older adult need a different protein target during treatment?

I would like to know what to measure as much as what to do.

I have done this once and I suspect I got away with it rather than got it right.

For context: I keep records of every batch, every lot number and every result, so an answer that requires me to track something is fine.

What does a defensible version of this look like in practice?

Answering this needs the age and the baseline, since age-related sarcopenia and deficit-related lean loss are different processes that can coexist.

Resistance training remains effective into the ninth decade; the response is slower and smaller than in younger adults but it is not absent, which is the single most useful fact in this tag.

The European working group definition uses low grip strength or low chair-stand performance as the entry criterion, confirms with low appendicular skeletal muscle mass adjusted for height, and grades severity by gait speed or a short physical performance battery.

Resistance-training trials in adults over eighty demonstrate measurable strength and functional gains, which is the basis for recommending it regardless of age.

Nothing here is medical advice.

Strength first, mass second, performance for severity. That is the definition.

Answer first: sarcopenia is defined by low muscle strength with low muscle quantity, and function rather than mass is the primary criterion in the current definitions.

Common grip-strength cut-points are below about 27 kilograms for men and 16 for women, though the thresholds vary by definition and by population reference set.

Protein requirements are generally considered higher in older adults — often quoted at 1.2 to 1.5 g/kg for maintenance — because of anabolic resistance rather than because of increased losses.

The current operational definition comes from the revised European consensus, which moved strength ahead of mass as the primary criterion.

Research-use compounds are not approved for human use, and none of them is a treatment for this.

Higher protein per meal with age, because of anabolic resistance.

The underlying point is that this is a clinical diagnosis with cut-points, not a description of feeling weaker, and the distinction matters when people ask whether they have it.

Sarcopenic obesity is the combination that matters in this population: adequate or high total mass with low muscle mass, which no scale detects and which a body-mass index actively conceals.

Anabolic resistance in older adults is established from stable-isotope feeding studies and is why per-meal protein thresholds are higher with age.

Cut-points are population-referenced and differ between definitions, so a value near a threshold means little without the reference set.

Sarcopenic obesity is invisible on a scale. Measure or you will not see it.

The short version: strength first, mass second, physical performance to grade severity. That ordering is deliberate and recent.

Gait speed below about 0.8 metres per second is the usual severity marker and is the measure most strongly associated with adverse outcomes.

The caveat is that this is a clinical diagnosis and self-diagnosis from a home scale is not possible; bioimpedance in particular is unreliable at these thresholds.

Resistance training works at every age studied. Slower, smaller, still real.