A new review of published evidence challenges current guidelines that suggest in order to reduce heart disease risk, people should generally restrict intake of saturated fats - like those found in butter and dairy foods - in favor of unsaturated fats - such as in margarine and sunflower oil.The analysis, published in the journal Annals of Internal Medicine by an international group led by a team at the UK's University of Cambridge, included 72 separate studies on heart risk and intake of fatty acids.

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