To provide a functional food having obesity improving and preventing effects that use a health promotion effect of charcoal and is easy to take and has no side effect.SOLUTION: The functional food contains a charcoal composition comprising at least one of bamboo charcoal, bincho charcoal, activated bamboo charcoal and activated bincho charcoal, where, the activated bamboo charcoal and activated bincho charcoal each have a bulk density of 0.3-0.6 g/ml, an average particle size of 10 μm or less, a BET specific surface of 1000-1200 m/g, and an iodine adsorption of 1000-1300 mg/g.SELECTED DRAWING: Figure 7【課題】炭による健康増進効果を利用すると共に摂取が容易で副作用もなく、肥満改善及び肥満抑制効果を有する機能性食品を提供する。【解決手段】竹炭、備長炭、賦活竹炭及び賦活備長炭のうち少なくとも１種からなる炭組成物を含有し、当該賦活竹炭及び賦活備長炭は、いずれも嵩密度が０．３～０．６ｇ／ｍｌ、平均粒径が１０μｍ以下、ＢＥＴ比表面積が１０００～１２００ｍ２/ｇ、ヨウ素吸着量が１０００～１３００ｍｇ/ｇであることを特徴とする。【選択図】図７
