PROBLEM TO BE SOLVED: To provide pharmaceuticals, quasi drugs, food, feed and materials blendable thereto, having excellent GLP-1 secretion promoting effect and also high safety.SOLUTION: In this invention, Dioscorea bulbifera Linn. or its extract is used as an active ingredient.COPYRIGHT: (C)2015,JPO&INPIT【課題】優れたGLP-1分泌促進作用を有し、且つ安全性が高い医薬品、医薬部外品、食品、飼料及びそれらに配合可能な素材を提供する。【解決手段】カシュウイモ又はその抽出物を有効成分とする。【選択図】なし