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An omega−3 fatty acid is a fatty acid with multiple double bonds, where the first double bond is between the third and fourth carbon atoms from the end of the carbon atom chain. "Short-chain" omega−3 fatty acids have a chain of 18 carbon atoms or less, while "long-chain" omega−3 fatty acids have a chain of 20 or more.
In the body, LA is desaturated to form GLA (18:3 ω-6), yet dietary GLA is anti-inflammatory. Some observations partially explain this paradox: LA competes with α-linolenic acid (ALA, 18:3 ω-3) for Δ6-desaturase and thereby eventually inhibits the formation of anti-inflammatory EPA (20:5 ω-3). In contrast, GLA does not compete for Δ6 ...
To illustrate the amounts of EPA and DHA in supplements, a softgel capsule containing fish oil derived from pollock might contain a total of 642 mg of total fish oil, of which 584 mg are omega−3 fatty acids, with 377 mg EPA and 158 mg DHA. 3 That same company's salmon oil softgel contains 1008 mg of total fish oil, of which 295 mg are omega ...
Intake of large doses (2.0 to 4.0 g/day) of long-chain omega−3 fatty acids as prescription drugs or dietary supplements are generally required to achieve significant (> 15%) lowering of triglycerides, and at those doses the effects can be significant (from 20% to 35% and even up to 45% in individuals with levels greater than 500 mg/dL).
Mammals are unable to synthesize omega−3 fatty acids, but can obtain the shorter-chain omega−3 fatty acid ALA (18 carbons and 3 double bonds) through diet and use it to form the more important long-chain omega−3 fatty acids, EPA (20 carbons and 5 double bonds) and then from EPA, the most crucial, DHA (22 carbons and 6 double bonds). [2]
The figure shows the ω−3 and −6 synthesis chains, along with the major eicosanoids from AA, EPA, and DGLA. Dietary ω−3 and GLA counter the inflammatory effects of AA's eicosanoids in three ways, along the eicosanoid pathways: Displacement—Dietary ω−3 decreases tissue concentrations of AA, so there is less to form ω−6 eicosanoids.
There has been a growing interest in the role of long-chain omega-3 polyunsaturated fatty acids to reduce inflammation and alleviate the symptoms of RA. Metabolism of omega-3 polyunsaturated fatty acids produces docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), which inhibits pro-inflammatory eicosanoids and cytokines (TNF-a, IL-1b ...
In physiological literature, it is listed by its lipid number, 18:3 (n−3). It is a carboxylic acid with an 18-carbon chain and three cis double bonds. The first double bond is located at the third carbon from the methyl end of the fatty acid chain, known as the n end. Thus, α-linolenic acid is a polyunsaturated n−3 (omega-3
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