Farm-raised tilapia, one of the most highly consumed fish in America, has very low levels of beneficial omega-3 fatty acids and, perhaps worse, very high levels of omega-6 fatty acids, according to new research from Wake Forest University School of Medicine.
The researchers say the combination could be a potentially dangerous food source for some patients with heart disease, arthritis, asthma and other allergic and auto-immune diseases that are particularly vulnerable to an “exaggerated inflammatory response.” Inflammation is known to cause damage to blood vessels, the heart, lung and joint tissues, skin, and the digestive tract.
“In the United States, tilapia has shown the biggest gains in popularity among seafood, and this trend is expected to continue as consumption is projected to increase 67% from 1.5 million tons in 2003 to 2.5 million tons by 2010,” write the Wake Forest researchers in an article published this month in the Journal of the American Dietetic Association.
They say their research revealed that farm-raised tilapia, as well as farmed catfish, “have several fatty acid characteristics that would generally be considered by the scientific community as detrimental.” Tilapia has higher levels of potentially detrimental long-chain omega-6 fatty acids than 80-percent-lean hamburger, doughnuts and even pork bacon, the article says.
“For individuals who are eating fish as a method to control inflammatory diseases such as heart disease, it is clear from these numbers that tilapia is not a good choice,” the article says. “All other nutritional content aside, the inflammatory potential of hamburger and pork bacon is lower than the average serving of farmed tilapia.”
The article notes that the health benefits of omega-3 fatty acids, known scientifically as “long-chain n-3 polyunsaturated fatty acids” (PUFAs), have been well documented. The American Heart Association now recommends that everyone eat at least two servings of fish per week, and that heart patients consume at least 1 gram a day of the two most critical omega-3 fatty acids, known as EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid).
But, the article says, the recommendation by the medical community for people to eat more fish has resulted in consumption of increasing quantities of fish such as tilapia that may do more harm than good, because they contain high levels of omega-6 fatty acids, also called n-6 PUFAs, such as arachidonic acid.
“The ratio of arachidonic acid (AA) to very long-chain n-3 PUFAs (EPA and DHA) in diets of human beings appears to be an important factor that dictates the anti-inflammatory effects of fish oils,” the researchers write. They cite numerous studies, including a recent one that predicts “that changes in arachidonic acid to EPA or DHA ratios shift the balance from pro-inflammatory [agents] to protective chemical mediators … which are proposed to play a pivotal role in resolving inflammatory response” in the body.
For their study, the authors obtained a variety of fish from several sources, including seafood distributors that supply restaurants and supermarkets, two South American companies, fish farms in several countries, and supermarkets in four states. All samples were snap-frozen for preservation pending analysis, which was performed with gas chromatography.
The researchers found that farmed tilapia contained small amounts of omega-3 fatty acids – less than half a gram per 100 grams of fish, similar to flounder and swordfish. Farmed salmon and trout, by contrast, had nearly 3 and 4 grams, respectively.
At the same time, the tilapia had much higher amounts of omega-6 acids generally and AA specifically than both salmon and trout. Ratios of omega-6 to omega-3 in tilapia averaged about 11:1, compared to much less than 1:1 (indicating more EPA than AA) in both salmon and trout.
“We have known for three decades that arachidonic acid is the substrate for all pro-inflammatory lipid mediators,” Chilton said in an interview. “The animal studies say unequivocally that if you feed arachidonic acid, the animals show signs of inflammation and get sick.
“A New England Journal of Medicine article three years ago said if you had heart disease and had a certain genetic makeup, and you ate arachidonic acid, the diameter of your coronary artery was smaller, a major risk factor for a heart attack,” said Chilton. “My point is that it’s likely not worth the risk in this or other vulnerable populations.”
Chilton said tilapia is easily farmed using inexpensive corn-based feeds, which contain short chain omega-6s that the fish very efficiently convert to AA and place in their tissues. This ability to feed the fish inexpensive foods, together with their capacity to grow under almost any condition, keeps the market price for the fish so low that it is rapidly becoming a staple in low-income diets.
“Cardiologists are telling their patients to go home and eat fish, and if the patients are poor, they’re eating tilapia. And that could translate into a dangerous situation.”
Co-authors of the study are Kelly L. Weaver, Ph.D., Priscilla Ivester, Joshua A. Chilton, Martha D. Wilson, Ph.D., and Prativa Pandey, all with Wake Forest School of Medicine. The research was funded by the National Center for Complementary and Alternative Medicine and the Office of Dietary Supplements of the National Institutes of Health (NIH), and by an NIH Molecular Medicine training grant.
Wake Forest University Baptist Medical Center (www.wfubmc.edu) is an academic health system comprised of North Carolina Baptist Hospital, Brenner Children’s Hospital, Wake Forest University Physicians, and Wake Forest University Health Sciences, which operates the university’s School of Medicine and Piedmont Triad Research Park. The system comprises 1,154 acute care, rehabilitation and long-term care beds and has been ranked as one of “America’s Best Hospitals” by U.S. News & World Report since 1993. Wake Forest Baptist is ranked 32nd in the nation by America’s Top Doctors for the number of its doctors considered best by their peers. The institution ranks in the top third in funding by the National Institutes of Health and fourth in the Southeast in revenues from its licensed intellectual property.
Changes in diet during the past century have caused a marked increase in consumption of saturated fatty acids and n-6 polyunsaturated fatty acids (PUFAs) with a concomitant decrease in the intake of n-3 PUFAs. Increased fish consumption has been shown to be the only realistic way to increase dietary quantities of beneficial long-chain n-3 PUFAs such as eicosapentaenoic acid and docosahexaenoic acid and re-establish more balanced n-6:n-3 ratios in the diets of human beings. Our objective in this research was to characterize some of the relevant fatty acid chemistry of commonly consumed fish, with a particular focus on the four most commonly consumed farmed fish. To do this, 30 commonly consumed farmed and wild fish were collected from supermarkets and wholesalers throughout the United States. Fatty acid composition of samples from these fish was determined using gas chromatography. The 30 samples studied contained n-3 PUFAs ranging from fish having almost undetectable levels to fish having nearly 4.0 g n-3 PUFA per 100 g fish. The four most commonly farmed fish, Atlantic salmon, trout, tilapia, and catfish, were more closely examined. This analysis revealed that trout and Atlantic salmon contained relatively high concentrations of n-3 PUFA, low n-6:n-3 ratios, and favorable saturated fatty acid plus monounsaturated fatty acid to PUFA ratios. In contrast, tilapia (the fastest growing and most widely farmed fish) and catfish have much lower concentrations of n-3 PUFA, very high ratios of long chain n-6 to long chain n-3 PUFAs, and high saturated fatty acid plus monounsaturated fatty acid to PUFA ratios. Taken together, these data reveal that marked changes in the fishing industry during the past decade have produced widely eaten fish that have fatty acid characteristics that are generally accepted to be inflammatory by the health care community.
Kelly L. Weaver, PhD, Priscilla Ivester, MS, Joshua A. Chilton, Martha D. Wilson, PhD, Prativa Pandey, Floyd H. Chilton, PhD. The Content of Favorable and Unfavorable Polyunsaturated Fatty Acids Found in Commonly Eaten Fish; Journal of the American Dietetic Association; Volume 108, Issue 7, Pages 1178-1185 (July 2008)
Wake Forest University Baptist Medical Center Released: Tue 08-Jul-2008