[PROBLEMS] To provide a substance having an anorexigenic activity. [MEANS FOR SOLVING PROBLEMS] Disclosed is an anorexigenic agent comprising a product prepared by any treatment of an Eucommia ulmoides oliver leaf as an active ingredient. In one embodiment, disclosed is an anorexigenic agent in the form of a beverage or food, which comprises a product prepared by any treatment of an Eucommia ulmoides oliver leaf as an active ingredient.