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Chapter 5.1 of the book "Vitamin & Mineral Requirements in Human Nutrition" is presented. This section discusses the role of vitamin E in human metabolic processes. It explores vitamin E as the major lipid-soluble antioxidant in the cell antioxidant defense sustem. The biological role of vitamin E to protect polyunsaturated fatty acids and other components of cell membranes and low-density lipoprotein is also highlighted.

The article explores the link between fatty acids and the immune system. It presents the definition, synonyms and classifications of fatty acids. It describes the essential fatty acids: linoleic and α-linoleic acids. It discusses the effects of consuming fatty acids, particularly n-3 polyunsaturated fatty acids (PUFA), on the cardiovascular system. It cites the recommended optimum intake of n-3 PUFA in the U.S. and Great Britain.

A definition of the term "polyunsaturated fatty acid" is presented. It refers to fatty acids that contain more than one double bond.

The article presents an encyclopedia entry for eicosapentanoic acid (EPA). It is a 20-carbon fatty acid containing five double bonds, with the first double bond on the third carbon atom from the methyl end. It can be formed from its precursor α-linolenic acid. EPA can be obtained from oily fish or fish oil supplements.

A definition of the term "eicosanoids" is presented. It refers to a family of hormone-like compounds formed by hydroxylation of 20-carbon polyunsaturated fatty acids, particularly arachidonic acid. It acts rapidly and locally regulating inflammation, lymphocyte function, chemotaxis, blood pressure, pain and blood clotting.

A definition of the term arachidonic acid is presented. It refers to a 20-carbon polyunsaturated fatty acid.