The participants consumed either a diet high in cereal fibre ( whole grain wheat/rye : 30-50 g/day ) and coffee ( 5 cups/day ) , and free of red meat ( L-RISK , n = 17 ) or a diet low in fibre ( 10 g/day ) , coffee-free and high in red meat ( 150 g/day ) diet ( H-RISK , n = 20 ) .