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Human requirement for N-3 polyunsaturated fatty acids.

A P Simopoulos1

  • 1The Center for Genetics Nutrition and Health, Washington, DC 20009, USA. cgnh@bellatlantic.net

Poultry Science
|July 20, 2000
PubMed
Summary

Ancestral diets were rich in fiber and balanced in essential fatty acids (n-6 and n-3). Modern Western diets are deficient in n-3 fatty acids, impacting health and development.

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Area of Science:

  • Nutritional Science
  • Human Evolution
  • Biochemistry

Background:

  • Human diets have evolved significantly, with ancestral diets characterized by high fiber, lean proteins, fruits, vegetables, and a balanced ratio of omega-6 (n-6) and omega-3 (n-3) essential fatty acids.
  • Modern Western diets exhibit a drastically altered n-6 to n-3 ratio (10:1–25:1), contrasting sharply with the ancestral 1:2:1 ratio, leading to a deficiency in crucial n-3 polyunsaturated fatty acids (PUFA).
  • n-6 and n-3 fatty acids, including linoleic acid (LA), alpha-linolenic acid (ALA), arachidonic acid (AA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA), are vital components of cell membranes and play distinct, often opposing, physiological roles.

Purpose of the Study:

  • To highlight the critical differences between ancestral and modern dietary fatty acid profiles, particularly the n-6/n-3 ratio.
  • To emphasize the metabolic and functional distinctions between n-6 and n-3 PUFA and their importance for physiological balance.
  • To underscore the necessity of re-evaluating dietary recommendations to address the n-3 deficiency in Western populations and its implications for health.

Main Methods:

  • Comparative analysis of ancestral and modern dietary fatty acid compositions.
  • Review of the metabolic pathways and physiological functions of n-6 and n-3 essential fatty acids and their metabolites (AA, EPA, DHA).
  • Examination of scientific literature on the impact of n-6/n-3 balance on human development, chronic disease, and mental health.

Main Results:

  • Ancestral diets featured a balanced n-6 to n-3 ratio (1:2:1) with higher levels of long-chain PUFA compared to current Western diets.
  • Modern Western diets are characterized by an excessive n-6 to n-3 ratio (10:1–25:1), indicating a significant deficit in n-3 fatty acids.
  • DHA is crucial for retinal and brain development, especially in premature infants, and a balanced n-6/n-3 ratio is linked to improved growth, reduced cardiovascular disease, and better mental health.

Conclusions:

  • Western diets require a reduction in n-6 fatty acid intake and an increase in n-3 fatty acid intake to align with evolutionary patterns.
  • The food industry is beginning to address this imbalance by enriching foods with n-3 fatty acids.
  • Establishing adequate intake (AI) levels and considering dosage, safety, and sources are crucial for successful n-3 enrichment of the food supply.

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