To provide an agent suppressing an increase in blood sugar level, said agent being capable of controlling blood sugar level even in a patient having normal blood sugar level or a patient corresponding to pre-diabetes, showing little side effects and being derived from a safe food. Also, the present invention addresses the problem of providing foods and drinks, i.e., foods including health foods, functional foods, health supplements, etc. as well as drinks, each comprising the aforesaid composition. An extract of yeast to be used as an active ingredient. As the extract of yeast, it was found that a yeast extract, which can be obtained by a simple procedure comprising treating a yeast with hot water, an acid or an alkali, and/or an enzyme, has an improved effect of suppressing an increase in blood sugar level.本發明之課題在於提供一種可從血糖值為正常之狀態、或糖尿病高危險群之階段進行血糖值控制的副作用少且安全的來自食物之血糖上升抑制劑。進一步旨在提供包含該組成物的飲食品、健康食品、機能性食品、健康輔助食品等食品類、飲料類。 係以酵母之萃取物作為有效成分。就酵母萃取物而言，發現藉由將酵母進行諸如熱水處理、酸或鹼處理、及酵素處理之簡單操作而獲得的酵母萃取物具有更加優異的血糖上升抑制作用。
