Eating omega-3-rich fish like tuna has beneficial effects on heart rhythms, and may offer protection against fatal arrhythmias, suggests a cohort study led by Harvard researchers.

Omega-3 fatty acids have been linked to health benefits, including protection against cardiovascular disease (CVD), good development of a baby during pregnancy, joint health, behaviour and mood, and certain cancers.

A recent meta-analysis claimed that there was no evidence linking omega-3 intake and improvements in heart health, conclusions that were later slammed by a UK-based fish group.

Now, the new cross-sectional cohort study, led by Darius Mozaffarian from the Harvard Medical School, extends previous research on fish oil and heart health by reporting that fish consumption is linked to improved electrical properties of heart cells.

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