While fish oil supplements, rich in omega-3 fatty acids, are known to be good for heart health, a new study on Wednesday showed that regular consumption may raise the risk of heart disease and stroke.
For the study, an
international team of researchers from China, the UK, and the US analysed the
health of 415,737 participants (55 per cent women), aged 40-69, who regularly
consumed oily and non-oily fish and fish oil supplements.
The participants were
surveyed between 2006 and 2010 and tracked until the end of March 2021 or
death, whichever came first, based on medical records data.
Their results, published
in the open-access journal BMJ Medicine, showed that regular use of fish oil
supplements had different roles in cardiovascular health, disease progression,
and death.
People with no known
heart problems who regularly used fish oil supplements had a 13 per cent higher
risk of developing atrial fibrillation, and a 5 per cent risk of a stroke.
The risk of
transitioning from good health to heart attack, stroke, or heart failure was 6
per cent higher in women and 6 per cent higher in non-smokers.
In contrast, among those
with known cardiovascular disease, regular fish oil supplements lowered the
risk of progression from atrial fibrillation to a heart attack by 15 per cent,
and from heart failure to death by 9 per cent.
Age, sex, smoking,
consumption of non-oily fish, high blood pressure, and use of statins and blood
pressure-lowering drugs were found to determine the associations observed.
Calling "this is an
observational study, and no conclusions can be drawn about causal
factors", the researchers stressed the need for further studies to
determine the precise mechanisms.
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