An agent for improving glucose tolerance disorder that comprises, as an active ingredient, partition chromatography peak components of an alcoholic extract of gramineous plant seeds, said peak components preferably comprising an alkyl resorcinol (AR) mixture containing multiple kinds of alkyl resorcinols. This mixture preferably contains an AR of general formula (I) wherein R1 is a saturated or unsaturated alkyl group having 15 carbon atoms, an AR of general formula (I) wherein R1 is a saturated or unsaturated alkyl group having 17 carbon atoms, an AR of general formula (I) wherein R1 is a saturated or unsaturated alkyl group having 19 carbon atoms, an AR of general formula (I) wherein R1 is a saturated or unsaturated alkyl group having 21 carbon atoms, an AR of general formula (I) wherein R1 is a saturated or unsaturated alkyl group having 23 carbon atoms, and an AR of general formula (I) wherein R1 is a saturated or unsaturated alkyl group having 25 carbon atoms, each in a specific amount.In general formula (I): R1 represents a saturated or unsaturated alkyl group having 15-25 carbon atoms and R2 represents a hydrogen atom or a methyl group.Linvention concerne un agent pour améliorer un trouble de tolérance au glucose, qui comprend, comme principe actif, des constituants de pic de chromatographie de partage dun extrait alcoolique de graines de plante graminée, lesdits constituants de pic comprenant de préférence un mélange de résorcinol alkyle (AR) contenant de multiples types de résorcinols alkyles. Ce mélange contient de préférence un AR de formule générale (I) dans laquelle R1 est un groupe alkyle saturé ou insaturé ayant 15 atomes de carbone, un AR de formule générale (I) dans laquelle R1 est un groupe alkyle saturé ou insaturé ayant 17 atomes de carbone, un AR de formule générale (I) dans laquelle R1 est un groupe alkyle saturé ou insaturé ayant 19 atomes de carbone, un AR de formule générale (I) dans laquelle R1 est un groupe alkyle saturé ou insaturé ayant
