PROBLEM TO BE SOLVED: To provide a composition which decreases hemoglobin A1c and/or blood glucose level and which is useful in treatment of diabetes.SOLUTION: A composition contains water or ethanol extract of black soybeans, and black soybean peel, and a mass ratio of polyphenol and proteins (polyphenol/proteins) contained in the composition is 3-10. The composition contains powder obtained by extracting black soybeans with water or ethanol at 80-150°C and drying the extract, and powder obtained by extracting black soybean peel with water or ethanol and drying the extract, and the amount of polyphenol contained in 1 g of the composition is 140 mg or more.COPYRIGHT: (C)2014,JPO&INPIT【課題】ヘモグロビンA1cおよび/または血糖値を低下させ、糖尿病の治療に有用な組成物の提供。【解決手段】黒豆の水またはエタノール抽出物と黒豆の皮を配合してなる組成物であって、該組成物に含まれる、ポリフェノールとタンパク質の質量比(ポリフェノール/タンパク質)が3~10である、組成物。該組成物は、黒豆を80~150℃の水またはエタノールで抽出し乾燥させた粉体と、黒豆の皮の水またはエタノールで抽出し乾燥させた粉体とを配合してなる組成物であり、組成物1g中のポリフェノール量が140mg以上含まれる。【選択図】なし
