The purpose of the present invention is to newly discover a transient receptor potential ankyrin 1 (TRPA1) agonist that exhibits an action for increasing the amount of food ingested, to provide a novel agonist of TRPA1, or to provide a novel active ingredient that exhibits an action for increasing the amount of food ingested or an action for improving anorexia. A compound having a specific fatty acid or a specific anthraquinone structure has an effect for activating TRPA1 and can be used as an active ingredient for increasing the amount of food ingested and/or improving anorexia.