- Design
- Two prospective population cohorts with repeated frailty assessment
- Population
- 6,562 community-dwelling older adults in Spain
- Primary outcome
- Frailty by Fried phenotype
- Effect
- Highest vs lowest adherence tertile: pooled OR 0.52 (0.38–0.70)
Two Spanish population cohorts of community-dwelling older adults (Seniors-ENRICA-1, 3,289 people aged 60 and over, and Seniors-ENRICA-2, 3,273 aged 65 and over) had diet recorded at baseline and frailty measured repeatedly by the Fried phenotype.
Those with the highest adherence to the Planetary Health Diet Index had lower odds of frailty over time than those with the lowest: OR 0.62 (95% CI 0.42 to 0.92) and 0.40 (0.24 to 0.65) in the two cohorts, and 0.52 (0.38 to 0.70) pooled. The association ran mainly through physical activity, and vegetables and fruit were the components most strongly linked.
People who eat more vegetables tend to be more active, wealthier and healthier in ways a model cannot fully adjust for. The finding fits broader advice on varied, plant-rich diets in older age, but it is not a reason to restrict protein in someone at risk of sarcopenia.
- Encourage a varied diet rich in vegetables, fruit, legumes and whole grains in older adults.
- Make sure older adults still get enough protein, especially those losing weight or muscle.
- Pair dietary advice with activity advice; the association ran largely through physical activity.
- Screen for unintentional weight loss, one of the frailty criteria.
Why it matters
It links sustainable eating with healthy ageing, but the evidence is associational.
Don't overread it
Observational — it does not show that changing diet prevents frailty.
The statistics, in plain English
A pooled OR of 0.52 means about half the odds of frailty in the most adherent third. This is observational, so healthier lifestyles overall may explain much of it. Results come from Spanish adults and may not transfer to other diets.
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