PROBLEM TO BE SOLVED: To obtain foods and medicines having high dipeptidyl peptidase IV (DPP-4) inhibitory activity, blood glucose level lowering activity, and/or type 2 diabetes treatment and/or prevention activity. SOLUTION: Fermented mushroom mushroom milk used for inhibiting DPP-4, lowering blood glucose level, and/or treating and/or preventing type 2 diabetes, and fermenting milk with mushrooms. A method for producing the fermented milk, which comprises the fermented milk, and which is used for inhibiting DPP-4, lowering a blood glucose level, and/or treating and/or preventing type 2 diabetes. Food and pharmaceutical compositions. [Selection diagram] None
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