多不饱和脂肪酸（PUFA）及其代谢物具有多种生理功能，包括能量供应，膜

Polyunsaturated fatty acids (PUFA) and their metabolites in a variety of physiological functions, including energy supply, membrane structure, cell signal transduction and regulation of gene expression. PUFA are essential components of higher eukaryotes can be imparted to the membrane fluidity, flexibility, permeability and selectivity. Scratch metabolic processes in mammalian tissue can not meet the requirements of PUFA. Animals rely on plants to provide two major precursor n-6 and n-3 fatty acids, i.e., C18: 2n-6 (linoleic acid, LA), and C18: 3n-3 (α- linolenic acid, of ALA)

Polyunsaturated fatty acids (PUFA) and their metabolites have a variety of physiological functions, including energy supply, membrane structure, cell signal transduction and gene expression regulation. PUFA is an essential ingredient in advanced eukaryotic organisms and can give cell membranes fluidity, flexibility and selective permeability. The head-from metabolism process in mammalian tissue does not meet the requirements of PUFA. Animals rely on plants to provide two main precursors of n-6 and n-3 fatty acids, C18:2n-6 (linoleic acid, LA) and C18:3n-3 (alpha-linolenic acid, ALA)

Polyunsaturated fatty acids (PUFA) and its metabolites have many physiological functions, including energy supply, membrane structure, cell signal transduction and gene expression regulation. PUFA is an essential component in advanced eukaryotes, which can give cell membrane fluidity, flexibility and selective permeability. The de novo metabolism in mammalian tissues can not meet the requirements of PUFA. Animals rely on plants to provide the two main precursors of n-6 and n-3 fatty acids, namely, c18:2n-6 (linoleic acid, LA) and c18:3n-3 (α - linolenic acid, ALA)