PROBLEM TO BE SOLVED: To provide a blood sugar concentration rise inhibitor which can adjust a blood glucose level in a body in a normal range by controlling a blood sugar concentration rise after meal, and is useful for the decrease, prevention, improvement, moderation or treatment of a crisis risk of diabetes, obesity or arteriosclerosis.SOLUTION: The blood sugar rise concentration inhibitor includes a polyglutamic acid in which a carboxyl group of a &gamma； position and an amino group of an &alpha； position of glutamic acid are peptide-bonded and at least 50% of a hydrogen atom of the carboxyl group is substituted with potassium, as an active constituent.【課題】食後の血糖濃度上昇を抑制することで体内の血糖値を正常な範囲に調節することができ、糖尿病や肥満、動脈硬化症の発症リスクの低下・予防・改善・緩和・処置に有用な血糖濃度上昇抑制剤の提供。【解決手段】グルタミン酸のγ位のカルボキシル基とα位のアミノ基がペプチド結合したポリグルタミン酸でそのカルボキシル基の水素原子の５０％以上がカリウムに置換されたものを有効成分として含有する医薬又は食品用途として有用な血糖濃度上昇抑制剤。【選択図】なし
