Pooled calorie-restriction trials and a composite biomarker index in older adults
In a pooled analysis of seven randomized calorie-restriction trials (n=829), calorie restriction improved a composite biomarker index; mediation analysis suggested weight loss explained only 48.5% of this effect. [1]
Automatic summary · not editorially reviewed
The key findings
The abstract pooled data from seven randomized calorie-restriction trials with 829 participants and examined a biomarker index of CRP, IL-6, cystatin C, insulin, GDF-15 and TNF-R1. [1]
Calorie restriction improved the composite biomarker index, and mediation analyses showed 48.5% of the effects were explained by weight loss. [1]
The authors say the findings support composite biomarker indices as measures of intervention response and calorie restriction as a strategy to target biological aging. [1]
The source at a glance
- Study type / format
- Pooled analysis of seven randomized trials (abstract).
- Population / context
- Older adults in seven randomized calorie-restriction trials (n=829).
- Summary based on
- Study abstract
- Original publication
- September 12, 2026
Pooled trials of calorie restriction in older adults
The abstract reports pooling data from seven randomized calorie-restriction trials with 829 participants. The authors note that calorie restriction extends lifespan and delays age-related diseases in model organisms, but its effects on biological aging in humans remain unclear. The analysis examined randomization to calorie restriction and change in weight against a biomarker index made up of CRP, IL-6, cystatin C, insulin, GDF-15 and TNF-R1.
Supporting source [1]
Biomarker index improved; weight loss partly explained it
Calorie restriction improved the composite biomarker index. After adjustment for weight, the calorie-restriction effect fell from -2.2 to -1.2 (95% CI -2.0 to -0.3); the weight-loss effect fell from 0.22 to 0.16 (95% CI 0.09 to 0.23) when calorie restriction was in the model. The authors say this suggests improvements are only partially mediated by the amount of weight loss. Mediation analyses showed 48.5% (95% CI 22.6 to 82.2%) of the calorie-restriction effects were explained by weight loss.
Supporting source [1]
Abstract-only scope of the pooled biomarker findings
The authors conclude that the findings support the potential of composite biomarker indices as measures of intervention response and calorie restriction as a strategy to target biological aging. This is an abstract; the full text was not reviewed. The abstract does not report trial durations, participant ages, the individual trial designs or adverse events, so these cannot be assessed here. The biomarker index is a composite of six blood markers, not a validated measure of lifespan, and the results are associations from pooled trials rather than proof of longer life.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. Trial durations, participant ages, individual designs and adverse events are not reported in the abstract. The biomarker index is a composite of six blood markers, not a validated lifespan measure, and results are associations from pooled trials.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Guida CA, Hsu FC, Neiberg R, Semelka C, Chen H, Kramer P, Houston DK, Nicklas B, Kritchevsky SB, Miller ME. · europepmc.org · September 12, 2026