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Omega 3-6-9 describes 3 different types of fatty acids, each with its own characteristics, and certainly not only found in deep sea fish.
Omega 3 fatty acids are considered to be essential fatty acids (human cannot synthesis these fatty acids in the body) and must be obtained from a food source; a family of polyunsaturated fatty acids. Scientific researches have found that Omega 3 fatty acids have potential affect on cancer and cardiovascular disease preventions, but most recently, research are looking at the ratios of Omega 6 to Omega 3 consumption, believing that 10:1 or 4:1 will have a more beneficial effect.
For more health benefits, please visit FDA.gov or other websites.
Omega 3s are found in both plant and animal forms:
Fish oils are high in the animal form of Omega 3 fatty acids - eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA). These forms of Omega 3 can be used directly by our biochemical systems.
亞麻籽 (flaxseed) - high in the plant form of Omega 3 fatty acids - α-linolenic acid (ALA). The body must transform ALA into DHA and EPA before it can be used by our systems, and the conversion efficacy is fairly low. Therefore, it is hypothesised that ALA might have a less efficient effect on the body compared with the animal forms of Omega 3.
Omega 6 is also a polyunsaturated fatty acid, and an essential fatty acid. They are found in nuts, whole grains, and most vegetable oils - high in Canola and grapeseed oils. Some medical research has suggested that excessive levels of omega-6 acids, relative to Omega-3 fatty acids, may increase the probability of a number of diseases and depression.
Omega 9 is a class of unsaturated fatty acids, but not an essential fatty acid. Oleic acid is one of them, and It is the major component of Olive oil and many monounsaturated oils. These fatty acids do not have any major health benefits.
Although there are suggesting health benefits of Omega 3, it is best to absorb them via consumption of foods - fatty fish (Salmone, Tuna), Flax seed or oil.
Hope this helps =)