review · Journal of Lipids
Polyunsaturated fatty acids (PUFAs), specifically omega-3 and omega-6 families, are crucial for human health but have opposing metabolic functions. Omega-3 PUFAs, such as ALA, EPA, and DHA, generally inhibit inflammation, platelet aggregation, and promote vasodilation. Conversely, most omega-6 PUFAs, including LA and AA, enhance inflammation, platelet aggregation, and vasoconstriction. Modern diets are characterised by a significant overconsumption of omega-6 PUFAs and a deficiency of omega-3 PUFAs, resulting in a highly imbalanced ratio of 20-50:1, far exceeding the recommended 4-5:1. This imbalance is strongly linked to the development of chronic diseases, including those involving thrombus and atheroma formation, allergic and inflammatory disorders, and an overactive endocannabinoid system.
Understanding the balance between omega-3 and omega-6 fatty acids is vital because their dietary ratio profoundly impacts human health. An imbalanced intake, common in modern diets, contributes to chronic diseases by promoting inflammation and other harmful physiological responses. Correcting this balance through dietary choices can significantly reduce health risks.
This research highlights the critical need for dietary interventions to rebalance omega-6 and omega-3 intake. It could inform the development of functional foods, dietary supplements, or nutritional guidelines aimed at achieving the recommended 4-5:1 ratio. Potential users include public health organisations, food manufacturers, and individuals seeking to improve their health through diet. This is applied research with clear implications for product development and public health programmes.
AI-generated from the published abstract. Always read the original work before citing.
Polyunsaturated fatty acids (PUFAs) contain ≥2 double-bond desaturations within the acyl chain. Omega-3 (n-3) and Omega-6 (n-6) PUFAs are the two known important families in human health and nutrition. In both Omega families, many forms of PUFAs exist: α-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA) from the n-3 family and linoleic acid (LA), dihomo-γ-linolenic acid (DGLA), and arachidonic acid (AA) from the n-6 family are the important PUFAs for human health. Omega-3 and Omega-6 PUFAs are competitively metabolized by the same set of desaturation, elongation, and oxygenase enzymes. The lipid mediators produced from their oxidative metabolism perform opposing (antagonistic) functions in the human body. Except for DGLA, n-6 PUFA-derived lipid mediators enhance inflammation, platelet aggregation, and vasoconstriction, while those of n-3 inhibit inflammation and platelet aggregation and enhance vasodilation. Overconsumption of n-6 PUFAs with low intake of n-3 PUFAs is highly associated with the pathogenesis of many modern diet-related chronic diseases. The volume of n-6 PUFAs is largely exceeding the volume of n-3PUFAs. The current n-6/n-3 ratio is 20-50/1. Due to higher ratios of n-6/n-3 in modern diets, larger quantities of LA- and AA-derived lipid mediators are produced, becoming the main causes of the formation of thrombus and atheroma, the allergic and inflammatory disorders, and the proliferation of cells, as well as the hyperactive endocannabinoid system. Therefore, in order to reduce all of these risks which are due to overconsumption of n-6 PUFAs, individuals are required to take both PUFAs in the highly recommended n-6/n-3 ratio which is 4-5/1.
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DOI: 10.1155/2021/8848161
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