- Design
- Two prospective cohorts with repeated frailty assessment
- Population
- 3,289 and 3,273 community-dwelling older adults in Spain
- Primary outcome
- Frailty (Fried phenotype) by tertile of Planetary Health Diet Index
- Effect
- Highest vs lowest tertile, pooled OR 0.52 (95% CI 0.38 to 0.70)
Two cohorts of community-dwelling Spanish adults aged 60 or older (Seniors-ENRICA-1, 3,289; Seniors-ENRICA-2, 3,273) were followed with repeated frailty assessments. Adherence to the Planetary Health Diet, a plant-based pattern, was scored from 0 to 140 across 15 food groups. Frailty was defined by the Fried phenotype.
Comparing the highest with the lowest tertile of adherence, the adjusted odds ratio for frailty was 0.62 (95% CI 0.42 to 0.92) in the first cohort, 0.40 (0.24 to 0.65) in the second and 0.52 (0.38 to 0.70) pooled. Adherence was mainly linked to lower odds of low physical activity, and vegetables and fruit showed the strongest independent associations among the components.
Diet was measured at baseline and people who eat well often differ in other ways, despite adjustment. Fewer frail people may also simply be more able to eat well. The findings fit a general advice to eat more vegetables and fruit, not a prescription for a specific pattern.
- Encourage vegetables and fruit in older adults; these showed the strongest links.
- Assess frailty with a structured tool such as the Fried criteria or a frailty index.
- Ensure adequate protein and energy intake in frail patients rather than restricting diet.
- Account for cost, access and local foods when advising on diet in India.
Why it matters
It adds diet quality to the list of modifiable factors that track with frailty, alongside activity.
Don't overread it
Observational cohorts in Spanish adults do not show that adopting this diet prevents frailty.
The statistics, in plain English
An odds ratio of 0.52 means about half the odds of frailty in the top tertile of adherence compared with the bottom, after adjustment. Observational cohorts can show a link but cannot show that changing diet changes frailty.
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