Extremely high intake of omega-6s creates need for major increase in omega-3 intake; drastic drop in omega-6 intake would cut omega-3 requirement 10/16/2006
Two of the world's best-respected omega-3 researchers—Vital Choice science advisor William E. Lands, Ph.D., (pictured above) and psychiatrist Joseph Hibbeln, M.D.—were part of a team from the US National Institutes of Health (NIH) that set out to calculate the omega-3 intake needs of people in 13 countries, including America.
A groundbreaking aspect of the study was their decision to take into account the amounts of omega-6 fatty acids Americans and others consume.
As our readers know, the average American's diet is grossly imbalanced in favor of omega-6 fatty acids, which are concentrated in certain areas of the American diet:
- The vegetable oils most commonly used in homes and in packaged or restaurant foods (corn, canola, soy, safflower, sunflower)
- Eggs (except high-omega-3 eggs from flaxseed-fed hens)
- Soy milk
- Poultry (especially fatty parts)
- Red meats, including pork, lamb, and beef (grass-fed animals have more omega-3s than their grain-fed counterparts, but comparable levels of omega-6s).
This extreme imbalance in Americans' diets reduces the amounts of omega-3s that can get into their cells.
The goal: Dietary Reference Intakes for omega-3s
The Recommended Dietary Allowance (RDA) figures once found on food package reflected the amount of a nutrient needed to prevent signs of deficiency in 97–98 percent of consumers.
But in recent years, the US Institute of Medicine established new, generally higher intake guidelines called "Dietary Reference Intakes” (DRIs), with the goal of reducing the risk of chronic, degenerative diseases rather than just preventing obvious nutrient deficiencies.
In essence, the NIH team led by Drs. Lands and Hibbeln set out to establish "super" DRIs for omega-3s.
In particular, they sought to determine the omega-3 intake levels needed to increase the proportion of omega-3 fatty acids in Americans' tissues to 60 percent of total fatty acids: the proportion found in Japan, where people enjoy far lower rates of cardiovascular disease, stroke, and depression.
Their findings indicate that Americans need to consume 3.5 grams (3,500mg) of marine omega-3s per day to achieve this goal: a figure much higher than their actual daily intake of omega-3s, which averages a pathetically inadequate 23mg.
New advice supersedes AHA guidelines
The American Heart Association (AHA) recommends that everyone eat two servings of oily fish twice a week. A six-ounce serving of sockeye would provide about four grams of omega-3s per week, or 571 mg per day.
The NIH team is not alone in concluding that the AHA's recommended omega-3 intake levels, while beneficial, fall short of being optimal.
A recent evidence review from New York's Rockefeller University (Breslow JL 2006) notes that people probably need daily doses of omega-3s (EPA and DHA) higher than three grams per day to decrease cardiovascular disease risks.
Note: While a dose of three grams per day may increase the risk of hemorrhagic strokes (due to thinner blood) to a minuscule extent, the NIH team points out that that risk is vastly outweighed by that dose's ability to reduce the risk of far more common thrombotic (clot-driven) strokes and other causes of death or disability.
Reduce omega-3 requirements by cutting omega-6 intake
Americans could achieve the NIH team's tissue-level goal with a far lower daily intake of omega-3s, if they could cut their intake of omega-6 fatty acids dramatically.
The NIH team estimated that if Americans' average omega-6 intake dropped by 80 percent, this would reduce the intake requirement for omega-3s from 3,500mg daily to just 350mg per day.
And this advice seems eminently practical since Americans' average omega-6 intake was much lower until about 75 years ago.
Currently, Americans get about nine percent of their daily calories from omega-6 fatty acids (i.e., 20 grams of omega-6s per day), so they would need to cut omega-6 intake to two percent of daily calories (i.e., 4-5 grams per day) in order to reduce their need for omega-3s to an easily obtainable 350 mg per day.
This drop in omega-6 intake may sound drastic, but two percent of daily calories (4-5 grams per day) was the omega-6 intake level found safe and adequate at the 2004 meeting of the International Society for the Study of Fatty Acids and Lipids, whose membership consists of the leading fatty acid researchers in the world, including members of the US Institute of Medicine.
The NIH team noted that diets during the 4–5 million years of human evolution were likely abundant in freshwater and salt water animals and plants and other sources of omega-3s (e.g., leafy greens) but included very few calories from omega-6-rich seed oils.
So avoid high-omega-6 oils like corn, soy, safflower, sunflower, and cottonseed and foods made with them ... which include many if not most restaurant and takeout meals.
- Hibbeln JR, Nieminen LR, Blasbalg TL, Riggs JA, Lands WE. Healthy intakes of n-3 and n-6 fatty acids: estimations considering worldwide diversity. Am J Clin Nutr. 2006 Jun;83(6 Suppl):1483S-1493S.
- Hibbeln JR, Nieminen LR, Lands WE. Increasing homicide rates and linoleic acid consumption among five Western countries, 1961–2000. Lipids 2004;39:1207–13.
- Breslow JL. n-3 fatty acids and cardiovascular disease. Am J Clin Nutr. 2006 Jun;83(6 Suppl):1477S-1482S. Review.
- Wang C, Harris WS, Chung M, Lichtenstein AH, Balk EM, Kupelnick B, Jordan HS, Lau J. n-3 Fatty acids from fish or fish-oil supplements, but not alpha-linolenic acid, benefit cardiovascular disease outcomes in primary- and secondary-prevention studies: a systematic review. Am J Clin Nutr. 2006 Jul;84(1):5-17. Review.
- Gebauer SK, Psota TL, Harris WS, Kris-Etherton PM. n-3 fatty acid dietary recommendations and food sources to achieve essentiality and cardiovascular benefits. Am J Clin Nutr. 2006 Jun;83(6 Suppl):1526S-1535S. Review