The present invention relates to raw materials for foods, pharmaceuticals, and the like, wherein the raw materials can be effective in preventing and ameliorating various lifestyle-related diseases such as obesity and hyperlipidemia, safe, applicable in wide areas, and less deteriorative to texture; and the present invention also relates to a preventive/remedy for obesity, an agent for suppressing fat accumulation in internal organs, an agent for suppressing blood glucose level increase, or a preventive/remedy for diabetes, wherein acetylated starch or starch octenyl succinate is an active ingredient.