The Omega-6 to Omega-3 Ratio
Typical Western Diets Provide Ratios of Between 10:1 And 30:1 - Dramatically Skewed Toward Unheathfull Omega-6
Clinical studies indicate that the ingested ratio of omega-6 to omega-3 (especially Linoleic vs Alpha Linolenic) fatty acids are important to maintaining cardiovascular health.
Both omega-3 and omega-6 fatty acids are essential, i.e. humans must consume them in their diet. Omega-3 and omega-6 compete for the same metabolic enzymes, thus the omega-6:omega-3 ratio will significantly influence the ratio of the ensuing eicosanoids (hormones), (e.g. prostaglandins, leukotrienes, thromboxanes etc.), and will alter the body's metabolic function. Metabolites of omega-6 are significantly more inflammatory (esp. arachidonic acid) than those of omega-3. This necessitates that omega-3 and omega-6 be consumed in a balanced proportion; the ideal ratio of omega-6:omega-3 being from 1:1 to 1.5:1. Studies suggest that the evolutionary human diet, rich in seafood, nuts and other sources of omega-3, may have provided such a ratio.
Simopoulos, et al recommend daily intakes of three omega-3 forms: 650 mg of EPA and DHA, and 2.22 g of ALA, and one omega-6 form: 4.44 g of LA. This translates to a 3:2 omega-6 to omega-3 ratio. (i.e. 1.5:1)
Typical Western diets provide ratios of between 15:1 and 50:1 - i.e., dramatically skewed toward omega-6. Here are the ratios of omega-6 to omega-3 fatty acids in some common oils: canola 2:1, soybean 7:1, olive 13:1, sunflower (no omega-3), flax 1:3 cottonseed (almost no omega-3), peanut (no omega-3), grapeseed oil (almost no omega-3) and beware of corn oils 46 to 1 ratio of omega-6s to omega-3s which is the extreme reverse of desireable ratios.
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