PROBLEM TO BE SOLVED: To provide a medicine, foods or a material capable of formulating thereto, having activities of suppressing body weight gain, visceral fat accumulation and hepatic lipid accumulation, and useful for preventing or ameliorating obesity and fatty liver.SOLUTION: The agents for preventing or ameliorating obesity, suppressing visceral fat accumulation, suppressing hepatic lipid accumulation, and preventing or ameliorating fatty liver, include potassium alginate as an active component.COPYRIGHT: (C)2011,JPO&INPIT【課題】体重増加抑制作用、内臓脂肪蓄積抑制作用、肝臓脂質蓄積抑制作用を有し、肥満予防又は改善、脂肪肝予防又は改善のために有用な医薬品、食品又はこれらに配合し得る素材の提供。【解決手段】アルギン酸カリウムを有効成分とする肥満予防又は改善剤、内臓脂肪蓄積抑制剤、肝臓脂質蓄積抑制剤及び脂肪肝予防又は改善剤。【選択図】なし