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Doubts cast on oily fish benefits
There is no evidence of a clear benefit to health from fats which are commonly found in oily fish, researchers say.
Consumption of omega-3 fatty acids is thought to protect against heart disease and UK guidance advise eating up to four oily fish portions a week.
But the British Medical Journal review of 89 earlier studies looking at heart disease, cancer or strokes found no evidence the fats offered protection.