Swapping butter for a sunflower spread may not lower heart risk, say British Heart Foundation researchers.
Contrary to guidance, there is no evidence that changing the type of fat you eat from "bad" saturated to "healthier" polyunsaturated cuts heart risk.
They looked at data from 72 studies with more than 600,000 participants.
Heart experts stressed the findings did not mean it was fine to eat lots of cheese, pies and cakes.
Too much saturated fat can increase the amount of cholesterol in the blood, which can increase the risk of developing coronary heart disease.
Saturated fat is the kind of fat found in butter, biscuits, fatty cuts of meat, sausages and bacon, and cheese and cream.
Most of us eat too much of it - men should eat no more than 30g a day and women no more than 20g a day.
There has been a big health drive to get more people eating unsaturated fats such as olive and sunflower oils and other non-animal fats - instead.
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http://www.bbc.co.uk/news/health-26611861