Oligofructose increased breath hydrogen ( P < 0.0001 ) , late acetate concentrations ( P = 0.024 ) , tended to increase total area under the curve ( tAUC ) 420 mins peptide YY ( PYY ) ( P = 0.056 ) and reduced tAUC450 mins hunger ( P = 0.034 ) and motivation to eat ( P = 0.013 ) when compared with cellulose .