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Mayo Publication Reports Cardiovascular Risk Slashed with Higher Omega-3 Intake; Dosage Guidelines Suggested

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By Mayo Clinic • www.ProHealth.com • March 10, 2008


[Note: The full text of the article discussed here - “Omega-3 Fatty Acids for Cardioprotection” - is available free online.]

Mar 10 - ROCHESTER, Minn. Thousands of research studies have documented how the oils known as omega-3 fatty acids can benefit the cardiovascular system, particularly among people diagnosed with coronary artery disease. The incredible volume of research on this topic creates difficulty for many physicians and patients to stay current with findings and recommendations related to these oils.

In the March issue of Mayo Clinic Proceedings,* contributors briefly summarized current scientific data on omega-3 fatty acids and cardiovascular health, focusing on:

  • Who benefits most from their protective effects,
  • Recommended guidelines for administration and dosing, and
  • Possible adverse effects associated with their use.

DHA & EPA Cited

Two omega-3 fatty acids that have been associated with cardiovascular benefit, docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), are found in fish oils. The best sources for DHA and EPA are fatty coldwater fish such as herring, mackerel, salmon and tuna. Fish oil supplements or algae supplements also can provide omega-3 fatty acids.

Author James O'Keefe, MD, a cardiologist from the Mid America Heart Institute in Kansas City, Missouri, cites the results of several large trials that demonstrated the positive benefits associated with omega-3 fatty acids, either from oily fish or fish oil capsules.

CDV Event Risk Reduced 19% to 45% in Trials Involving 32,000 Participants

"The most compelling evidence for the cardiovascular benefit provided by omega-3 fatty acids comes from three large controlled trials of 32,000 participants randomized to receive omega-3 fatty acid supplements containing DHA and EPA or to act as controls," explains Dr. O'Keefe.

"These trials showed reductions in cardiovascular events of 19 percent to 45 percent. Overall, these findings suggest that intake of omega-3 fatty acids, whether from dietary sources or fish oil supplements, should be increased, especially in those with or at risk for coronary artery disease."

What Dosages Are Merited?

How much fish oil should people attempt to incorporate into their diets? According to Dr. O'Keefe:

  • People with known coronary artery disease should consume about 1 gram per day, while
  • People without disease should consume at least 500 milligrams (mg) per day.
  • "Patients with high triglyceride levels can benefit from treatment with 3 to 4 grams daily of DHA and EPA," says Dr. O'Keefe. "Research shows that this dosage lowers triglyceride levels by 20 to 50 percent."

About two meals of oily fish can provide 400 to 500 mg of DHA and EPA, so patients who need to consume higher levels of these fatty-acids may choose to use fish oil supplements to reach these targets.

Rate of Adverse Effects Same as with Placebo (Fake Dose)

Dr. O'Keefe also notes that research supports the effectiveness of combining the consumption of fish oil with the use of cholesterol-lowering medications called statins. Combination therapy with omega-3 fatty acids and a statin is a safe and effective way to improve lipid levels and cardiovascular health beyond the benefits provided by statin therapy alone. Blood DHA and EPA levels could one day be used to identify patients with deficient levels and to individualize therapeutic recommendations.

Dr. O'Keefe found little evidence of serious adverse effects associated with fish oil consumption. "In prospective placebo-controlled trials, no adverse effects were observed to occur at a frequency of more than 5 percent, and no difference in frequency was noted between the placebo and omega-3 fatty acid groups," he says.

The most commonly observed side effects include nausea, upset stomach and a "fishy burp." Taking the supplement at bedtime or with meals, keeping fish oil capsules in the freezer or using enteric-coated supplements may help reduce burping and upset stomach symptoms.

___

Note: To see an abstract of the article “Omega-3 Fatty Acids for Cardioprotection,” click here.




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