PROBLEM TO BE SOLVED: To provide a food or a pharmaceutical product capable of safely promoting proliferation of Bacteroides with few adverse effects.SOLUTION: An agent for promoting proliferation of Bacteriodes in the intestine includes at least one of polysaccharides and sugar absorption inhibitors. The food or the pharmaceutical product includes the agent.COPYRIGHT: (C)2014,JPO&INPIT【課題】安全で副作用の少ないバクテロイデス増殖を促進しうる食品または医薬品を提供。【解決手段】多糖類および糖吸収抑制物質の少なくとも1種を含有することを特徴とする腸内バクテロイデス増殖促進剤、これを含む食品または医薬品。【選択図】なし