Fish oil, rich in omega-3 fatty acids, has long been celebrated for its potential health benefits, particularly in reducing the risk of cardiovascular disease (CVD). However, recent research has prompted a reevaluation of its benefits, especially for individuals without existing cardiovascular risk. This blog post will explore the newest research on fish oil supplementation and highlight some surprising findings regarding its effects on those without cardiovascular risk.
What is Fish Oil?
Fish oil is derived from the tissues of oily fish and is a rich source of omega-3 fatty acids, primarily eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). These fatty acids are essential for human health, playing key roles in brain function, inflammation regulation, and heart health.
The Traditional View on Fish Oil
Historically, fish oil has been touted for its cardioprotective properties. Studies have shown that omega-3 fatty acids can help lower triglycerides, reduce inflammation, and potentially lower the risk of heart attacks and strokes. This has led to the widespread use of fish oil supplements, particularly among individuals seeking to prevent cardiovascular disease.
Recent Research on Fish Oil Supplementation: A Shift in Perspective
However, emerging research suggests that the benefits of fish oil supplementation may not be as universal as once thought. Several recent studies have investigated the effects of fish oil on individuals without cardiovascular risk and have yielded some unexpected results.
VITAL Study (2018)
The VITAL (Vitamin D and Omega-3 Trial) study, published in the New England Journal of Medicine, was a large-scale, randomized trial that examined the effects of vitamin D and omega-3 supplementation on the risk of cancer and cardiovascular disease. The study included over 25,000 participants who did not have a history of CVD or cancer at baseline.
Findings: The VITAL study found no significant reduction in major cardiovascular events (such as heart attacks and strokes) among participants taking omega-3 supplements compared to those taking a placebo. This suggests that fish oil may not provide cardiovascular benefits for those without preexisting risk factors.
ASCEND Trial (2018)
The ASCEND (A Study of Cardiovascular Events in Diabetes) trial, also published in the New England Journal of Medicine, focused on individuals with diabetes but no known cardiovascular disease. This study aimed to determine whether omega-3 supplementation could reduce the risk of serious cardiovascular events.
Findings: Similar to the VITAL study, the ASCEND trial found no significant reduction in the risk of serious cardiovascular events among those taking fish oil supplements compared to the placebo group. This further supports the idea that fish oil may not be beneficial for primary prevention in individuals without established CVD.
REDUCE-IT Study (2019)
While not specifically focused on individuals without cardiovascular risk, the REDUCE-IT trial highlighted an important nuance. This study showed that a specific high-dose formulation of EPA significantly reduced cardiovascular events in high-risk individuals. However, it’s essential to note that this benefit was observed in those with elevated triglycerides and additional cardiovascular risk factors, not in the general population.
Negative Effects of Fish Oil Supplementation
In addition to the lack of cardiovascular benefits in low-risk populations, some studies have also highlighted the potential negative effects of fish oil supplementation:
1. Increased Bleeding Risk
Omega-3 fatty acids have anticoagulant properties, which can increase the risk of bleeding, especially in individuals on blood-thinning medications or those with clotting disorders. This risk might outweigh the potential benefits in those without significant cardiovascular risk.
2. Gastrointestinal Issues
Some individuals report gastrointestinal side effects such as nausea, diarrhea, and fishy aftertaste when taking fish oil supplements. These adverse effects can be bothersome and may deter consistent use.
3. Interaction with Medications
Fish oil can interact with certain medications, including anticoagulants and blood pressure medications, potentially leading to adverse effects. Individuals must consult with healthcare providers before starting supplementation, especially if they are on other medications.
Recommendations Regarding Fish Oil Supplementation
Given the recent findings, it’s essential to approach fish oil supplementation with a nuanced perspective:
- For Individuals Without Cardiovascular Risk: The latest research suggests that fish oil supplements may not provide significant cardiovascular benefits for those without existing risk factors. Therefore, focusing on a balanced diet rich in natural sources of omega-3s, such as fatty fish (salmon, mackerel, sardines), flaxseeds, and walnuts, may be a more effective strategy.
- For Individuals with Cardiovascular Risk: Those with elevated cardiovascular risk or specific conditions like high triglycerides may still benefit from omega-3 supplementation. However, it’s important to do so under the guidance of a healthcare professional to ensure appropriate dosing and monitoring. If you’d like to see which omega-3 supplement we recommend, click on this link!
- Whole Foods First: Eating a diet rich in whole foods that naturally contain omega-3 fatty acids is preferable. This approach not only provides omega-3s but also offers additional nutrients and health benefits.
- Consult Healthcare Providers: Always consult with healthcare providers before starting any new supplement regimen, especially if you have underlying health conditions or are taking other medications.
Should You Supplement with Fish Oil or Not?
The recent studies on fish oil supplementation underline the importance of personalized nutrition recommendations. While fish oil may not offer significant benefits for individuals without cardiovascular risk, it remains valuable for those with specific health conditions. Ultimately, a balanced diet rich in whole foods is the cornerstone of optimal health.
Reference List:
Manson JE, Cook NR, Lee IM, et al. Marine n–3 Fatty Acids and Prevention of Cardiovascular Disease and Cancer. N Engl J Med. 2019;380(1):23-32. doi:10.1056/NEJMoa1811403.
Bowman L, Mafham M, Wallendszus K, et al. Effects of n-3 Fatty Acid Supplements in Diabetes Mellitus. N Engl J Med. 2018;379(16):1540-1550. doi:10.1056/NEJMoa1804989.
Bhatt DL, Steg PG, Miller M, et al. Cardiovascular Risk Reduction with Icosapent Ethyl for Hypertriglyceridemia. N Engl J Med. 2019;380(1):11-22. doi:10.1056/NEJMoa1812792.
Mozaffarian D, Wu JH. Omega-3 fatty acids and cardiovascular disease: Effects on risk factors, molecular pathways, and clinical events. J Am Coll Cardiol. 2011;58(20):2047-2067. doi:10.1016/j.jacc.2011.06.063.
Abdelhamid AS, Brown TJ, Brainard JS, et al. Omega-3 fatty acids for the primary and secondary prevention of cardiovascular disease. Cochrane Database Syst Rev. 2020;3(3)
. doi:10.1002/14651858.CD003177.pub4.
Nichols M, Townsend N, Scarborough P, Rayner M. Cardiovascular disease in Europe 2014: epidemiological update. Eur Heart J. 2014;35(42):2950-2959. doi:10.1093/eurheartj/ehu299.
