Fish is a good source of protein and doesn’t have the high saturated fat that fatty meat products do. Fatty fish like mackerel, lake trout, herring, sardines, albacore tuna and salmon are high in two kinds of omega-3 fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA).Omega-3 fatty acids benefit the heart of healthy people, and those at high risk of — or who have — cardiovascular disease ,according to AHA.
Dietary sources of omega-3 fatty acids include fish oil and certain plant/nut oils. Fish oil contains both docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), while some nuts (English walnuts) and vegetable oils (canola, soybean, flaxseed/linseed, olive) contain alpha-linolenic acid (ALA).
There is evidence from multiple large-scale population (epidemiologic) studies and randomized controlled trials that intake of recommended amounts of DHA and EPA in the form of dietary fish or fish oil supplements lowers triglycerides, reduces the risk of death, heart attack, dangerous abnormal heart rhythms, and strokes in people with known cardiovascular disease, slows the buildup of atherosclerotic plaques ("hardening of the arteries"), and lowers blood pressure slightly.
Omega-3 and omega-6 fatty acids are types of polyunsaturated fatty acids. Linolenic acid, the shortest chain omega-3 fatty acid, and linoleic acid, the shortest chain omega-6 fatty acid, are essential fatty acids. This means they cannot be synthesized by the body from other fatty acids and must be obtained from food. The most common fatty acids of each class are linolenic (18:3), EPA (20:5), DHA (22:6) for omega-3 and linoleic (18:2) and arachidonic (20:4) for omega-6. Some of the food sources of omega-3 fatty acids are fish and shellfish, flaxseed, walnuts, and canola oil.
omega-3 and omega-6 and obtaining these in equal amounts is considered optimalfor health. However, much higher levels of omega-6 fatty acids are now common in Western diets mainly through the increased use of vegetable oils. Modern diets can alsobe very low in omega-3 intake overall, and low levels have been linked to a litany ofadverse health outcomes including heart disease, stroke, Type II diabetes, arthritis,depression, breast and prostate cancer, hypertension, and several autoimmune disorders.
Omega-3 fatty acids can help lower your risk for heart disease, boost the immune system and protect against arrhythmias, but consuming enough can sometimes be a challenge.Omega-3 fatty acids are found in fatty fish and flaxseed. Fatty fish includes tuna, salmon, sardines and herring. Other fish and some vegetable oils have omega-3’s, just in much smaller amounts.
Omega-3 fatty acids are considered essential fatty acids, which means that they are essential to human health but cannot be manufactured by the body. For this reason, omega-3 fatty acids must be obtained from food. Omega-3 fatty acids can be found in fish and certain plant oils. It is important to maintain an appropriate balance of omega-3 and omega-6 (another essential fatty acid) in the diet as these two substances work together to promote health. Also known as polyunsaturated fatty acids (PUFAs), omega-3 and omega-6 fatty acids play a crucial role in brain function as well as normal growth and development.
We need omega-3 fatty acids for numerous normal body functions, such as controlling blood clotting and building cell membranes in the brain, and since our bodies cannot make omega-3 fats, we must get them through food. Omega-3 fatty acids are also associated with many health benefits, including protection against heart disease and possibly stroke. In addition to these established benefits for cardiovascular disease, omega-3 fatty acids in high doses (e.g 6-10 capsules per day) are used to treat depression. New studies are identifying potential benefits for a wide range of conditions including cancer, inflammatory bowel disease, and other autoimmune diseases such as lupus and rheumatoid arthritis.
Study supported on the positive role of omega-3 fatty acids in brain cell health. Omega-3 DHA is known to keep brain cell membranes healthy and appears to aid communication within brain cells.So you can eat well and keep your brain sharp and your heart healthy by adding more fatty fish like tuna, salmon, mackerel and sardines to your eating plan.
While research has shown that fish oil pills may lower high blood pressure, getting those heart-healthy fats from food might also help, a study suggests.
The study of middle-aged adults in China, Japan, Great Britain and the U.S. found that people who ate more foods rich in omega-3 fatty acids tended to have lower blood pressure. This relationship was seen with fish, as well as with vegetable sources, such as canola oil, soybean oil, flaxseeds and walnuts, according to lead author Dr. Hirotsugu Ueshima of Shiga University, Japan, and associates.
The findings, published online in the journal Hypertension, add to evidence of the heart benefits of omega-3 fatty acids.
Oily fish, such as salmon, mackerel and sardines, contain two types of omega-3 fats -- DHA and EPA -- that have been shown to reduce blood fats called triglycerides and possibly prevent dangerous heart-rhythm disturbances. Because of this, the American Heart Association recommends that adults eat fatty fish twice a week, and that people with heart disease consider taking fish oil pills to get extra DHA and EPA.
The effects of omega-3 fats on blood pressure are less clear. And it has not been known whether omega-3-rich foods, specifically, are helpful; this includes plant sources, which contain an omega-3 known as ALA, a precursor to DHA and EPA.
The new findings suggest that both fish and vegetable sources of omega-3 do offer a modest blood pressure benefit, according to the study authors.
Among 4,680 adults ages 40 to 59, those who ate relatively more omega-3 fats from food tended to have somewhat lower blood pressure. The results lend "modest support" to the general recommendation that adults bump up their omega-3 intake, the researchers conclude.
The study participants had their blood pressure measured several times over 3 weeks and were interviewed at each visit about their food intake for the previous day.
In general, the researchers found, blood pressure levels tended to dip as participants' omega-3 intake climbed -- even with a range of other factors taken into account, such as age, weight, exercise habits and cholesterol and saturated fat intake.
The benefit was most clear among people without high blood pressure and those who were not taking medication or following a special diet to control their elevated blood pressure.
The researchers suggest that people eat their omega-3 fats as part of an overall diet that helps control blood pressure. That includes limiting salt, alcohol and saturated fat, while getting enough vegetable protein and nutrients such as potassium and calcium.
"With blood pressure, every millimeter counts," Ueshima said in a statement. "The effect of each nutrient is apparently small but independent, so together they can add up to a substantial impact on blood pressure."
A 2006 report in the Journal of the American Medical Association concluded that their review of literature covering cohorts from many countries with a wide variety of demographic characteristics failed to demonstrate a link between omega-3 fatty acids and cancer prevention.This is similar to the findings of a review by the British Medical Journal of studies up to February 2002 that failed to find clear effects of long and shorter chain omega-3 fats on total mortality, combined cardiovascular events and cancer.
The major type of fat that makes up flax is omega-3 fatty acids. You may have heard of omega-3 fatty acids because they are a type of unsaturated fat, which is healthier for us than saturated fat.Flax is a grain, just like wheat, oats or corn. It just happens that flax is a very healthy grain with CANCER-FIGHTING ability.
Studies were made on the phospholipid fatty acid composition of the most important aquatic animals more correctly, the poikilothermic and of the omega-3 fatty acid composition, which presumably plays the most important role in the protection of the physical properties of cell membrane. The poikilothermic were freshwater and marine fish.
It is suggested that Cystic fibrosis (CF) is an inherited disease that affects the respiratory and digestive systems; patients try to incorporate more omega 3 fatty acids into their diet, which can be done with either food sources or supplements. Salmon, flax seeds, and walnuts are excellent food sources of omega 3 fatty acids. Before giving your child any over the counter supplements, discuss this with your CF dietitian or doctor.
The Harvard investigators concluded that increasing fish intake beyond one or two servings per week is unlikely to reduce the risk of coronary events substantially in men who are initially free of coronary disease. This is a prudent conclusion, and it could be extended to fish-oil capsules, which provide n-3 fatty acids in much larger amounts than are commonly consumed in food. Ascherio et al. found even less evidence of an effect of n-3 fatty acids than of fish itself, and the study therefore offers no support for the blanket use of fish-oil capsules.
The findings of the Health Professionals Follow-up Study should somewhat dampen enthusiasm for fish and fish oil as a panacea against coronary disease. A little fish may still do some good, but more fish is not necessarily better.
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