It was one of the simplest pieces of advice a doctor could give: to reduce the risk of heart disease, hold the butter and spread margarine instead. And over the past two decades, millions of people have made the switch, believing they were replacing cholesterol-raising saturated fats with cholesterol- lowering unsaturated fats.
The issue may not be that simple. A study by two Dutch scientists reported in last week's New England Journal of Medicine found that one of the ingredients in stick margarine actually increases the risk of heart disease. At fault are the so-called trans monounsaturated fatty acids used as...
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