The present invention provides a process for producing a γ-aminobutyric acid-rich material, wherein the production of γ-aminobutyric acid can be effectively increased by effectively utilizing papaya containing various enzymes while fermenting the papaya by lactic acid bacteria having an ability to form γ-aminobutyric acid, as well as a γ-aminobutyric acid-rich material, and drink and food containing the same. The process for producing a γ-aminobutyric acid-rich material includes adding glutamic acid, a salt thereof or a material containing the same to a papaya squeezed juice and then fermenting it by lactic acid bacteria, thereby increasing the production of γ-aminobutyric acid. The drink and food of the present invention is produced by adding the fermentation product obtained by this process.本發明提供一種能有效活用含有各種酶的木瓜,經由使具有γ-胺基丁酸生成能力的乳酸菌發酵,有效地增產γ-胺基丁酸的高γ-胺基丁酸高含有物的製造方法、及其含有物、以及含有它們的飲食品。該高γ-胺基丁酸含有物的製造方法的特徵在於,在木瓜果實榨汁液中加入麩胺酸或其鹽、或含有它們的物質,經由乳酸菌發酵,使γ-胺基丁酸增產,以及根據該方法的添加發酵物的飲食品。1‧‧‧木瓜果實2‧‧‧木瓜壓榨液3‧‧‧乳酸菌4‧‧‧麩胺酸鈉5‧‧‧γ-胺基丁酸高含量的木瓜發酵液
