Trans fatty acids have been linked to heart disease because, like saturated fats, they raise blood cholesterol levels. They are created when polyunsaturated and monounsaturated oils are hydrogenated, either naturally or industrially. Trans fatty acids occur in butter (5 percent) and in some margarines and spreads (0-10 percent). However, about half the margarines and spreads on the market are now virtually free of trans fatty acids. If you are concerned about heart disease and your blood cholesterol level, choose food products that are low in trans fatty acids.
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