Summary
This narrative review synthesises epidemiological evidence from large cohort studies on the relationship between diet and healthy aging. The review emphasises that the sources of dietary fat, protein, and carbohydrates matter more than their quantity; identifies shared components of traditional (Mediterranean, Nordic, Okinawa) and contemporary healthy dietary patterns (DASH, plant-based indices); and notes that combining a healthy diet with other lifestyle factors could extend disease-free life expectancy by 8–10 years. The author advocates for culturally tailored dietary recommendations and a healthier food environment, particularly for aging populations.
Regional applicability
These findings are broadly applicable to United Kingdom dietary guidance and public health strategy, as they are based on international epidemiological evidence and align with principles informing UK-based dietary recommendations. The emphasis on plant-based foods, limiting processed meats, and adapting recommendations to cultural preferences and individual needs translates directly to UK nutrition policy contexts; however, implementation would require targeted work to improve food environment accessibility in UK public institutions and care facilities for older adults.
Key measures
Mortality risk, chronic disease incidence, disease-free life expectancy, weight maintenance, macronutrient composition and food sources
Outcomes reported
The review synthesises epidemiological evidence on dietary factors associated with chronic disease risk, mortality, and healthy longevity, with particular emphasis on the relative importance of food sources and dietary patterns over macronutrient quantity. It identifies common components of traditional and contemporary dietary patterns linked to extended disease-free life expectancy.
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