n‐3 fatty acids as precursors for active metabolic substances: dissonance between expected and observed events

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Abstract
It may be hypothesized that many diseases are associated with an overproduction of eicosanoids from the n-6 acid, arachidonic acid (20:4n-6), and the formation and function of these n-6 eicosanoids can be antagonized by dietary n-3 fats. This hypothesis provides a basis for evaluating the benefits and risks of including various amounts of n-3 and n-6 fats in the diet. Understanding the impact of dietary polyunsaturated fats leads inevitably to a reappraisal of what is 'normal' in terms of what is typical and what is desirable for the fatty acid composition of tissue lipids, the magnitude of eicosanoid-mediated responses, and the frequency and severity of certain diseases.