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Sources of dietary fibre can be divided into three groups according to their effect on plasma lipids in humans: (1) a cholesterol-lowering effect demonstrated repeatedly by pectin, guar gum, psyllium and oat bran (sources of soluble fibre); (2) a possible, but not adequate, cholesterol-lowering effect by legumes, barley, rice bran and several types of gum; and (3) those sources that do not lower plasma cholesterol, such as wheat fibre, cellulose and lignin.
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A S Truswell (1995) studied this question.
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