What is omega 3 good for?CAN YOU TAKE TOO MUCH?

As with nearly all nutrients that come in supplement form, overdose is theoretically possible. But most people get far too little; experts say too much is rare!Western diets have changed to contain more processed foods and less fish in recent years, leaving our bodies both vulnerable to disease and deprived of a vital resource to combat it: omega-3 fatty acids. What is omega 3 good for?

These important fats give our bodies a cavalcade of essential benefits, prompting medical experts to push us to consume more seafood and take omega-3 supplements into consideration.

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But for all the positive attention, worrying about possible downsides is natural. Does taking omega-3s have any side effects? Is there so much we can take from them?

Research suggests we shouldnt be very concerned about eating too much omega-3. In fact, the vast majority of people are eating too little, not too much. And while some studies have found evidence of potential health risks in people who eat extremely high levels of these fatty acids, even then researchers say more work is needed to be sure the harm is real.

Most of the apparently legitimate concerns stem from having too much of a good thing, like reducing inflammation too much or lowering blood pressure in the small number of people who suffer from already-low blood pressure.

So, if youre eating seafood a few times a week or taking omega-3 supplements as recommended, the many omega-3 benefits you are getting almost certainly far outweigh the risks. Lets explore further.

What is omega 3 good for?Omega-3 Importance and Benefits:

There are different kinds of omega-3 fatty acids, but the most important in our diets are DHA and EPA (NIH OHS). These two fatty acids docosahexaenoic acid and eicosapentaenoic acid come almost entirely from seafood such as wild-caught salmon.

For example, a fillet of Alaskan Sockeye salmon from Vital Choice packs more than 1,100 milligrams of DHA and nearly 600 milligrams of EPA per serving. DHA and EPA are abundant in our eyes and brains, and theyre important to our bodys core functions in the heart, blood, and lungs (NIH ODS).

There is no doubt as to what is behind the health advantages of omega-3s. They act as building blocks for cell membranes all over our bodies. They’re still not there for humans. The kingdom of animals relies on omega-3s. By eating plankton, fish and other aquatic life forms get omega-3s, while ruminants such as cattle and sheep receive them from eating grass on land (using cud-chewing and their four-chambered stomachs to break cellulose bonds, something humans cant do).

And a variety of health advantages have been associated with omega-3 consumption. Countries that eat more oily fish, like Japan and the Mediterranean, have lower rates of heart disease, according to Heart UK. Meanwhile, heart disease is much more common in Western countries where people eat very little oily fish.

So, how much omega-3 should you get? Broadly speaking, most health experts agree that eating seafood a few times a week should offer an ample supply of fatty acids. But the recommended omega-3 dosage levels actually vary significantly between health organizations.

For example, the World Health Organization suggests that adults get at least 250 milligrams combined of DHA and EPA (WHO/FAO, 2008). But theres ample evidence that some people benefit from much higher levels of omega-3s. A clinical trial from the 1990s found that heart attacks and sudden deaths dropped dramatically among thousands of people who were given 850-milligram doses of omega-3s every day for several years (GISSI-Prevenzione, 1999). And these kinds of findings prompted the American Heart Association to recommend 1,000 milligrams of omega-3s daily for people with heart disease, and as much as 4,000 milligrams daily for people with high triglycerides, the blood-borne fat that, at high levels, is associated with increased heart disease risk (Skulas-Ray et al., 2019).

The brain may benefit from higher doses, too. In a study earlier this year, scientists looked at why studies of omega-3s and Alzheimers have never yielded clear insights (Arellanes et al., 2020). The researchers found that just a small percentage of the fatty acids we consume actually makes it to our brains, meaning that, though omega-3s may help stave off brain degeneration, theyre not always getting to where theyre needed. As a result, the team suggested that omega-3 doses may actually need to be higher to reduce the risk of Alzheimers disease.

Omega-3 Overdose?

So, whats the upper bound on omega-3 intake? Some researchers have suggested that theres no evidence of a limit on how much omega-3 a person should take (EFSA 2012).

But over the past decade, a handful of studies have suggested potential health concerns from eating too much omega-3. These studies typically involved giving very high supplement doses to rodents in an effort to study a hypothetical group of hyper-supplemented people, rather than people taking the kind of doses, either from supplements or whole fish, that a normal person consumes.

For example, in a meta-study published in 2013, researchers said they were worried that some foods were being artificially fortified with omega-3s (Fenton et al., 2013). If someone ate large amounts of those foods and also took large doses of omega-3 supplements, it could potentially cause health problems, the authors said.

The hyper-supplemented person, who can take high-dose omega-3 supplements and consume four to five omega-3-enriched foods a day, is our primary concern here,” study co-author Norman Hord of Oregon State University said in an announcement at the time. “This may probably carry an excessive amount to anyone.

In the group of studies they looked at, however, some rodents were fed a diet where a whopping six percent of their daily food intake by weight was made up of omega-3-rich fish oil. In humans, that would equate to more than 100 times the U.S. benchmark of 3,000 milligrams. The Administration of Food and Drugs says it is widely accepted as safe.And at the time, the authors themselves said there wasnt enough evidence to define what excessive consumption might look like in humans.

While its unclear if anyone actually has hyper-supplemented with omega-3s, the danger in these rare cases usually comes from having too much of a good thing.

For example, omega-3s are known for their ability to reduce blood pressure (Miller et al., 2014). Yet some people actually suffer from having blood pressure thats too low. Over-supplementing with omega-3s could potentially cause health problems for these people. The symptoms of low blood pressure include nausea, fatigue, and a lack of concentration, according to the American Heart Association.

Another concern stems from omega-3s proven ability to reduce inflammation in the body. In general, omega-3s play an important role in keeping the bodys inflammatory response in check. And there are a number of health benefits tied to reduced inflammation. However, inflammation is also an important tool that our bodies use to fight infections. So, among hyper-supplemented people, there is some concern that taking large amounts of omega-3 over long periods could stop the body from effectively fighting off infections (Fenton et al., 2013).

Not all of the studies fall into the too-much-of-a-good-thing category. For example, a study from way back in 1989 found that people with diabetes who took an astronomical 8,000 milligrams of omega-3 per day for months were more prone to high blood sugar levels. But other results contradicted that, including research that looked at 20 different studies of the issue and found no such connection (Chen et al., 2015).

Overall, experts say its not yet clear how much omega-3 is too much, and theres no evidence that moderate levels of consumption pose any risk. But most do agree that the general population isnt getting enough. So, in the meantime, if youre eating seafood several times a week, or sticking to the supplement dosage recommended by a quality fish oil supplier, you can feel confident that the omega-3 benefits far outweigh the risks.

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Sources:

National Institutes of Health – Office of Dietary Supplements, Omega-3 Fatty Acids and Health: Factsheet for Professionals. 2005

Interim Summary of Conclusions and Dietary Recommendations on Total Fat & Fatty Acids. From the Joint FAO/WHO Expert Consultation on Fats and Fatty Acids in Human Nutrition, 10-14 November, 2008, WHO, Geneva.

Dietary supplementation with n-3 polyunsaturated fatty acids and vitamin E after myocardial infarction: results of the GISSI-Prevenzione trial. Gruppo Italiano per lo Studio della Sopravvivenza nell’Infarto miocardico. Lancet. 1999 Aug 7;354(9177):447-55. Erratum in: Lancet 2001 Feb 24;357(9256):642. Erratum in: Lancet. 2007 Jan 13;369(9556):106. PMID: 10465168.

Omega-3 Fatty Acids for the Management of Hypertriglyceridemia: A Science Advisory From the American Heart Association. Ann C. Skulas-Ray, PhD, Peter W.F. Wilson, MD, FAHA, Chair, William S. Harris, PhD, FAHA, Eliot A. Brinton, MD, FAHA, Penny M. Kris-Etherton, PhD, RD, FAHA, Chesney K. Richter, PhD, Terry A. Jacobson, MD, FAHA, Mary B. Engler, PhD, RN, FAHA, Michael Miller, MD, FAHA, Jennifer G. Robinson, MD, MPH, FAHA, Conrad B. Blum, MD, FAHA, Delfin Rodriguez-Leyva, MD, PhD, Sarah D. de Ferranti, MD, MPH, FAHA, Francine K. Welty, MD, PhD, FAHA, On behalf of the American Heart Association Council on Arteriosclerosis, Thrombosis and Vascular Biology; Council on Lifestyle and Cardiometabolic Health; Council on Cardiovascular Disease in the Young; Council on Cardiovascular and Stroke Nursing; and Council on Clinical Cardiology

Arellanes IC, Choe N, Solomon V, et al. Brain delivery of supplemental docosahexaenoic acid (DHA): A randomized placebo-controlled clinical trial. EBioMedicine. July 2020:102883. doi:10.1016/j.ebiom.2020.102883

EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA); Scientific Opinion related to the Tolerable Upper Intake Level of eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and docosapentaenoic acid (DPA). EFSA Journal 2012; 10( 7):2815. [48 pp.] doi:10.2903/j.efsa.2012.2815.

Fenton, Jenifer I et al. Immunomodulation by dietary long chain omega-3 fatty acids and the potential for adverse health outcomes. Prostaglandins, leukotrienes, and essential fatty acids vol. 89,6 (2013): 379-90. doi:10.1016/j.plefa.2013.09.011

Paige E. Miller, Mary Van Elswyk, Dominik D. Alexander, Long-Chain Omega-3 Fatty Acids Eicosapentaenoic Acid and Docosahexaenoic Acid and Blood Pressure: A Meta-Analysis of Randomized Controlled Trials, American Journal of Hypertension, Volume 27, Issue 7, July 2014, Pages 885896, https://doi.org/10.1093/ajh/hpu024

Chen, Cai et al. Effects of Omega-3 Fatty Acid Supplementation on Glucose Control and Lipid Levels in Type 2 Diabetes: A Meta-Analysis. PloS one vol. 10,10 e0139565. 2 Oct. 2015, doi:10.1371/journal.pone.0139565

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