The present invention relates to a composition for preventing or treating obesity, comprising an amine derivative compound of a Monascus pigment that inhibits the differentiation of adipose progenitor cells, and a pharmaceutically acceptable carrier, wherein the fungus bacterium Monascus sp. The amine derivative compound synthesized by liquid culture of J101 (KCCM 10093) to produce a Monascus orange pigment and reacted with an amine compound inhibits the differentiation process of 3T3-L1, which is a progenitor cell, resulting in obesity. It is useful for preventing or treating obesity by inhibiting accumulation.;Monascus, Progenitor Cell, Differentiation
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