Muscle preservation begins with the foundations

THE ARISING · 24 OCTOBER 2026 · FULL ARTICLE

Maintaining muscle is part of maintaining independence. A systematic review in The Journal of Nutrition brings together evidence on nutritional approaches to sarcopenia, the age-related loss of muscle mass, strength and physical performance. Its strongest support goes to familiar foundations: protein-centered nutrition paired with resistance training, and correcting vitamin D deficiency when present.

Dharmansyah and colleagues included 248 studies concerning adults aged 60 and older. The collection comprised 236 primary studies and 12 systematic reviews or meta-analyses. Among the primary studies were 100 randomized trials, along with observational and other designs.

A synthesis, not one giant experiment

The authors did not pool all the studies into a single treatment effect. They used a synthesis without meta-analysis, examining the direction of findings and grading certainty. That distinction matters when a large study count appears in a headline.

For example, the review reported a favorable direction of effect in 84% of single-nutrient randomized trials. This is not an 84% chance of success for an individual, and it does not tell us the average size of benefit. Studies can differ in population, outcome and magnitude while pointing in the same direction.

Where the support was strongest

The authors rated protein-anchored strategies, including adequate intake and resistance training, as moderate-to-high-certainty approaches. Their discussion includes protein intakes around at least 1.0–1.2 grams per kilogram per day and leucine-enriched approaches. Those are research and guideline-context figures, not a personal prescription; needs and restrictions differ with clinical circumstances.

Vitamin D repletion in deficient older adults was also strongly supported within the review's framework. That is different from assuming that more vitamin D is better for everyone.

Mediterranean-style dietary patterns came next, with moderate certainty and evidence that was largely observational. Such associations support further study but do not establish that the diet alone prevented muscle loss.

The gut-muscle connection remains developmental

Approaches aimed at the gut microbiome were interesting but much less certain. Results tended to be favorable yet varied substantially, and the authors rated the evidence as low to very low certainty. They described microbiome targeting as a research priority rather than current prescriptive practice.

The review also found inconsistent diagnostic criteria and outcome reporting. That makes confident comparisons harder and limits firm clinical recommendations. A large literature can still leave important questions unresolved.

A useful order of attention

The editorial implication is to give established foundations sustained attention while newer mechanisms are tested. The goal is not only a scan showing more lean tissue, but strength and function that carry into daily life.

Future trials should use clearer, more consistent definitions and measure outcomes people recognize: mobility, capability and independence. The research is most useful when the measurements remain connected to those purposes.