PROBLEM TO BE SOLVED: To obtain an obesity-preventing and ameliorating agent and a material for foods, medicines, and the like, capable of exhibiting prophylaxis and ameliorating effects on onset of various life-style related diseases, for example, prophylaxis and amelioration of hyperlipemia, having high safety and broad application range and scarcely impairing texture.SOLUTION: This obesity prevention/amelioration agent contains acetylated starch or octenyl succinated starch. A viscero fat storage suppressor contains the acetylated starch or octenyl succinated starch as an active ingredient.COPYRIGHT: (C)2006,JPO&NCIPI【課題】 肥満予防・改善剤、高脂血症の予防・改善等、種々の生活習慣病の発症を予防・改善する効果を発揮し得る、安全性が高いと共に適用範囲が広く、且つ食感を損なうことが少ない食品、医薬品等の素材を提供する。【解決手段】 アセチル化澱粉又はオクテニルコハク酸化澱粉を有効成分とする肥満予防・改善剤。【選択図】なし