1. Plant Products and Human Nutrition Group, Division of Biochemistry and Molecular Biology, IBLS, University of Glasgow, Glasgow, G12 8QQ, UK, Department of Human Nutrition, Glasgow Royal Infirmary, Queen Elizabeth Building, Glasgow, G31 2ER, UK, Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen, AB21 9SB, UK, and Safeway Stores plc. 6 Millington Road, Hayes, Middlesex, UB3 4AY, UK