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Evidence-based nutrition.

D Trichopoulos1, P Lagiou, A Trichopoulou

  • 1Department of Epidemiology, Harvard School of Public Health, 677 Huntington Avenue, Boston, MA 02115, USA.

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Summary
This summary is machine-generated.

Defining an ideal diet involves two approaches: a bottom-up method analyzing disease-specific diets or a top-down method examining traditional diets for longevity. Longevity is the inverse of all-cause mortality.

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Area of Science:

  • Nutrition Science
  • Public Health
  • Epidemiology

Background:

  • The objectives of an ideal diet are debated, encompassing individual longevity, population health, equity, environmental impact, and cultural heritage.
  • Defining 'positive health' is complex; longevity is best understood as the inverse of all-cause mortality.
  • Establishing an ideal diet requires addressing multifaceted considerations beyond individual health.

Purpose of the Study:

  • To explore two distinct approaches for defining an ideal diet focused on longevity.
  • To contrast the 'bottom-up' epidemiological method with the 'top-down' cultural experience approach.
  • To clarify the definition of longevity as the inverse of mortality.

Main Methods:

  • The 'bottom-up' approach involves analyzing associations between food groups, nutrients, and specific disease incidence/mortality.
  • The 'top-down' approach evaluates and quantifies the impact of traditional, natural diets on longevity.
  • This study outlines conceptual frameworks rather than presenting empirical data.

Main Results:

  • Two primary methodologies for diet research are identified: bottom-up (disease-focused) and top-down (longevity-focused).
  • Mainstream nutritional epidemiology predominantly follows the bottom-up approach.
  • The top-down approach, focusing on cultural diets and longevity, is advocated by a smaller group of experts.

Conclusions:

  • The ideal diet's definition remains complex, with two main research strategies proposed.
  • Longevity is a more precise objective than 'positive health' for dietary studies.
  • Further research is needed to determine the optimal approach for establishing ideal dietary guidelines.