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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.
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]
It has been claimed that among hunter-gatherer populations, omega-6 fats and omega-3 fats are typically consumed in roughly a 1:1 ratio. [3] [4] [better source needed] At one extreme of the spectrum of hunter-gatherer diets, the Greenland Inuit, prior to the late Twentieth Century, consumed a diet in which omega-6s and omega-3s were consumed in a 1:2 ratio, thanks to a diet rich in cold-water ...
Tea is the second most consumed beverage worldwide behind water and has a slew of health benefits.
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 ...
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).
Omega-3-acid ethyl esters are used in addition to changes in diet to reduce triglyceride levels in adults with severe (≥ 500 mg/dL) hypertriglyceridemia. [3] In the European Union and other major markets outside the US, omega-3-acid ethyl esters are indicated for hypertriglyceridemia by itself, or in combination with a statin for people with mixed dyslipidemia.
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.