Omega-3 Fatty Acids Benefit Women's Health

HEALTH NEWS

Omega-3 fatty acid intake can be a boon to women's health. According to researchers, supplementing with omega-3 fatty acids may help prevent preeclampsia, postpartum depression, menopausal problems, postmenopausal osteoporosis, and breast cancer, among other ailments in women.

The benefits of omega-3s apparently go even further. "An increased prostacyclin/thromboxane ratio induced by omega-3 fatty acids can facilitate pregnancy in women with fertility problems by increasing uterine blood flow," researchers noted. They added that omega-3 supplementation during pregnancy can also lower the risk of premature birth and increase the length of pregnancy and birth weight. And, taking omega-3s during pregnancy and breast feeding may help the child's brain development.

Researchers also cited that omega-3 fatty acids can have a powerful impact on cardiovascular health. "Because elevated triglyceride levels are associated with cardiovascular disease, especially in women; and because omega-3 fatty acids have powerful effects on triglycerides, women in particular gain from an increased intake of these fatty acids. This is especially important in women receiving hormone therapy, which can increase triglyceride levels."

Source: Obstetrical & Gynecological Survey 59(10):722-730, 2004

Fats for your Heart

In 2002, the American Heart Association released a scientific statement, “Fish Consumption, Fish Oil, Omega-3 Fatty Acids and Cardiovascular Disease,” on the effects of omega-3 fatty acids on heart function (including antiarrhythmic effects), hemodynamics (cardiac mechanics) and arterial endothelial function. The link between omega-3 fatty acids and CVD risk reduction are still being studied, but research has shown that omega-3 fatty acids

• decrease risk of arrhythmias, which can lead to sudden cardiac death
• decrease triglyceride levels
• decrease growth rate of atherosclerotic plaque
• lower blood pressure (slightly)

What do epidemiological and observational studies show?

Epidemiologic and clinical trials have shown that omega-3 fatty acids reduce CVD incidence.  Large-scale epidemiologic studies suggest that people at risk for coronary heart disease benefit from consuming omega-3 fatty acids from plants and marine sources. The ideal amount to take isn’t clear.  Evidence from prospective secondary prevention studies suggests that taking EPA+DHA ranging from 0.5 to 1.8 grams per day (either as fatty fish or supplements) significantly reduces deaths from heart disease and all causes.  For alpha-linolenic acid, a total intake of 1.5–3 grams per day seems beneficial.

Randomized clinical trials have shown that omega-3 fatty acid supplements can reduce cardiovascular events (death, non-fatal heart attacks, non-fatal strokes).  They can also slow the progression of atherosclerosis in coronary patients.  However, more studies are needed to confirm and further define the health benefits of omega-3 fatty acid supplements for preventing a first or subsequent cardiovascular event.  For example, placebo-controlled, double-blind, randomized clinical trials are needed to document the safety and efficacy of omega-3 fatty acid supplements in high-risk patients (those with type 2 diabetes, dyslipidemia, hypertension and smokers) and coronary patients on drug therapy.  Mechanistic studies on their apparent effects on sudden death also are needed.
 

Increasing omega-3 fatty acid intake through foods is preferable.  However, coronary artery disease patients may not be able to get enough omega-3 by diet alone.  These people may want to talk to their doctor about taking a supplement.  Supplements also could help people with high triglycerides, who need even larger doses.  The availability of high-quality omega-3 fatty acid supplements, free of contaminants, is an important prerequisite to their use.

AHA Recommendation
Omega-3 fatty acids benefit the heart of healthy people, and those at high risk of — or who have — cardiovascular disease. 

We recommend eating fish (particularly fatty fish) at least two times a week.  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).

We also recommend eating tofu and other forms of soybeans, canola, walnut and flaxseed, and their oils. These contain alpha-linolenic acid (LNA),  which can become omega-3 fatty acid in the body. The extent of this modification is modest and controversial, however. More studies are needed to show a cause-and-effect relationship between alpha-linolenic acid and heart disease.

The table below is a good guide to use for consuming omega-3 fatty acids.
 
Summary of Recommendations for Omega-3 Fatty Acid Intake

Population	Recommendation
Patients without documented coronary heart disease (CHD)	Eat a variety of (preferably fatty) fish at least twice a week. Include oils and foods rich in alpha-linolenic acid (flaxseed, canola and soybean oils; flaxseed and walnuts).
Patients with documented CHD	Consume about 1 g of EPA+DHA per day, preferably from fatty fish.  EPA+DHA in capsule form could be considered in consultation with the physician.
Patients who need to lower triglycerides	2 to 4 grams of EPA+DHA per day provided as capsules under a physician’s care.

Patients taking more than 3 grams of omega-3 fatty acids from capsules should do so only under a physician’s care.  High intakes could cause excessive bleeding in some people. 

Source: American Heart Association, www.americanheart.org