- New research finds that taking omega-3 supplements is associated with an increased risk of atrial fibrillation in people with a high risk of, or existing, heart disease.
- Experts say the relationship between using omega-3 supplements and heart health is complicated.
- Talk with your doctor about your risks and what is best for you.
A recent news article published in the Health Line explains why people at risk of heart disease may want to avoid fish oil.
New analysis by European Society of Cardiology
According to a new analysis by the European Society of Cardiology, omega-3 fatty acid supplements are associated with an increased likelihood of developing atrial fibrillation (AFib) in people with high triglyceride levels.
Triglycerides are a type of fat found in the blood.
“Currently, fish oil supplements are indicated for patients with elevated plasma triglycerides to reduce cardiovascular risk,” study author Salvatore Carbone, PhD, of Virginia Commonwealth University said in a statement.
“Due to the high prevalence of elevated triglycerides in the population, they can be commonly prescribed,” he added.
Five randomized controlled trials
The new analysis looked at five randomized controlled trials and investigated the effects of omega-3 fatty acid supplementation on cardiovascular outcomes.
Study participants had high triglyceride levels. They were at elevated risk of cardiovascular disease or had already received a diagnosis of it.
More than 50,000 participants were given fish oils (a source of omega-3s) or a placebo. Researchers followed them up for up to 7.4 years. The dosage of fish oil was between 0.84 grams and 4 grams daily.
Researchers found that omega-3 fatty acid supplementation was associated with significantly increased risks of AFib compared with a placebo.
Atrial fibrillation increases stroke risk
“Atrial fibrillation is an arrhythmia, abnormal heart rhythm, characterized by irregular electrical activity in the top chamber of the heart, the left atrium,” Dr. Michael Goyfman, director of clinical cardiology at Long Island Jewish Forest Hills in New York, told Healthline.
“While some people may feel [heart] palpitations in the setting of atrial fibrillation, others have no symptoms,” he said.
Goyfman added that the main concern with AFib is the risk of a stroke or other thromboembolic eventTrusted Source, in which a blood clot may form in the heart and then break off and travel to the brain or other organs.
“To decrease this risk, blood thinners are often prescribed to patients with AFib at higher risk of stroke,” Goyfman said.
Omega-3 fatty acids necessary for health
Omega-3s are essential fats that the body needs to stay healthy.
According to the National Institutes of HealthTrusted Source, omega-3s aren’t produced in the body. We have to consume them to maintain healthy levels.
Omega-3s come in three types:
- alpha-linolenic acid (ALA)
- eicosapentaenoic acid (EPA)
- docosahexaenoic acid (DHA)
The National Institutes of Health emphasizes that omega-3s are an important part of the membranes that surround each cell in our bodies.
Levels of DHA are especially high in the eyes, brain, and sperm cells, and play an important role in many bodily functions.
Goyfman confirmed that for healthy people who consume omega-3s as part of a diet like the Mediterranean diet, “the incidence of cardiovascular events was significantly decreased.”
A 2019 science advisory published in the journal Circulation said 4 grams per day of prescription omega-3s can lower triglyceride levels by 20 to 30 percent in most people.
But how important is reducing these levels?
“Triglycerides are a type of fat in our bodies, and their levels are measured with a blood test similar to other fats such as HDL, the ‘good’ cholesterol, and LDL, the ‘bad’ cholesterol,” Goyfman said.
“While there has been some association between high triglyceride levels and cardiovascular disease, causality has never been established,” he said, “and we currently do not use triglyceride levels to calculate someone’s risk of stroke or heart attack.”
More research needed
Goyfman said it’s important to keep in mind there are different types of omega-3s.
“Only EPA was used in the REDUCE-IT trial, and a mixture of EPA and DHA was used in the STRENGTH trialTrusted Source, which showed no benefit.
rguably, if different compounds were used, are we comparing apples to oranges.
Until further studies are done on specific types and dosages of omega-3s, Goyfman “would not recommend for patients to make a decision to either stop or start omega-3 supplementation without speaking with their physician.”
Epstein added that many supplements are poorly regulated, often have no warnings, and should be better regulated in general.
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Source : Health Line