オメガ 3 相關
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Omega−3 fatty acids, also called Omega−3 oils, ω−3 fatty acids, Ω-3 Fatty acids or n−3 fatty acids, are polyunsaturated fatty acids (PUFAs) characterized by the presence of a double bond, three atoms away from the terminal methyl group in their chemical
Omega-3 fatty acids, also called ω−3 fatty acids or n−3 fatty acids, are polyunsaturated fatty acids (PUFAs). Omega−3 fatty acids are important for normal metabolism.
- Uses
- Food Sources
- Health Effects
- Supplements
- Dangers
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Often marketed and sold for consumption as part of the diet or in dietary supplements in contemporary societies, fish oils also have found roles in external use, as emollientsor as general ointmentsas well as in body art,or for alleged insulation against cold temperatures.
The most widely available dietary source of EPA and DHA is cold-water oily fish, such as salmon, herring, mackerel, anchovies, and sardines. Oils from these fish have a profile of around seven times as much omega-3 oils as omega-6 oils. Other oily fish, such as tuna, also contain omega-3 in somewhat lesser amounts. Although fish is a dietary source...
History
Fish oil became one of the earliest dietary supplements, and by the end of the 19th century, was used as a treatment for many diseases, including such ailments as tuberculosis and hysteria. The possible effects of fish oil and omega-3 fatty acids have since been studied in clinical depression, anxiety, cancer, and macular degeneration, yet they have not been proven effective.
Various recommendations
In a 2009 letter on a pending revision to the Dietary Guidelines for Americans, the American Heart Association recommended 250–500 mg/day of EPA and DHA. The Guidelines were revised again for 2015–2020; included is a recommendation that adults consume at least eight ounces of a variety of types of fish per week, equating to at least 250 mg/day of EPA + DHA.[citation needed]The Food and Drug Administration recommends not exceeding 3 grams per day of EPA + DHA from all sources, with no more tha...
Prostate cancer
The effect of fish oil consumption on prostate cancer is controversial. For instance, one study showed decreased risk with higher blood levels of DPA. However, another reported increased risk of more aggressive prostate cancer with higher blood levels of combined EPA and DHA.Some evidence indicated an association between high blood levels of omega-3 fatty acids and an increased prostate cancer risk. However, this evidence from the Select Trial has been challenged on the grounds of methodology...
Fish oil is a commonly used dietary supplement, with sales in the US alone reaching $976 million in 2009.By 2020 the global omega-3 supplement market size had reached $5.58 billion, and fish oil based supplements accounted for 63.1% of that market.
A 2013 review concluded that the potential for adverse events among older adults taking fish oil "appear mild–moderate at worst and are unlikely to be of clinical significance".
Omega-3 fish oil supplements have no standard doses and vary considerably by producers and producers' products, but salmon oil consistently has more DHA than EPA while other fish oils have more EPA...Plant-based omega-3s are rich in ALA but completely lack EPA and DHA, so vegetarians and vegans seeking non-fish sources turn to more expensive algae derived oils. There is generally a pattern of m...International Fish Oil Standards Archived 29 March 2019 at the Wayback Machine – An organization concerned with the quality of omega-3 products as it relates to the international standards establis...Joyce A. Nettleton (ed.). "PUFA Newsletter". Retrieved 20 February 2006.Two newsletters, both quarterly, reviewing recent publications in essential fatty acids. One is written for researchers, the...Docosahexaenoic acid (DHA) is an omega-3 fatty acid that is a primary structural component of the human brain, cerebral cortex, skin, and retina. It is given the fatty acid notation 22:6(n-3). It can be synthesized from alpha-linolenic acid or obtained directly from
Eicosapentaenoic acid ( EPA; also icosapentaenoic acid) is an omega-3 fatty acid. In physiological literature, it is given the name 20:5 (n-3). It also has the trivial name timnodonic acid.
Omega-3-acid ethyl esters are a mixture of ethyl eicosapentaenoic acid and ethyl docosahexaenoic acid, which are ethyl esters of the omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) found in fish oil.
Only two fatty acids are known to be essential for humans: alpha-linolenic acid (an omega-3 fatty acid) and linoleic acid (an omega-6 fatty acid ). These are supplied to the body either as the free fatty acid, or more commonly as some glyceride derivative. [3] Deficiency in these fatty acids is rare.
