A large research project, published in the scientific journal BMJ, has focused attention on the use of omega-3 supplements.
Researchers examined data from around 400,000 people in the British health database UK Biobank, where participants were followed for approximately 12 years.
The study found a statistical association between regular use of fish oil and a higher incidence of the heart rhythm disorder atrial fibrillation.
A small increase in the risk of stroke was also observed.
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Widely used supplement
Omega-3 is one of the most widely used dietary supplements in the world. Many people take the capsules to support heart and brain health.
The fatty acids occur naturally in foods such as oily fish as well as in some plant-based products. For this reason, health authorities often recommend obtaining them through the diet.
However, researchers and doctors have long debated whether supplements provide the same effect as eating fish and other natural sources of omega-3.
Different effects
The study also showed a different result among people who already had heart disease.
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In this group, omega-3 supplements were associated with a lower risk of the disease worsening and with fewer fatal complications.
The British Heart Foundation notes, however, that the researchers did not know the exact type of fish oil or the doses used by participants. This makes it more difficult to draw firm conclusions.
Overall, the research suggests that omega-3 capsules may be associated with an increased risk of certain heart problems in healthy adults, while the effect may be different for people with heart disease.
Sources: Nyheder 24, BMJ, and LADbible.
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