The number of patients with food allergy has increased dramatically over the last several decades. However, there is no effective drug for food allergies. My results indicate that kakkonto has therapeutic effects on the development of allergic diarrhea in mouse food allergy model. The development of allergic diarrhea resulted from the enhancement of immune responses and the infiltration of mucosal mast cells in the colon. Kakkonto has immunosuppressive effects on the enhanced immune responses and interferes with the infiltration of mucosal mast cells in the colons of food allergy mouse, leading to improvement of allergic symptoms. Moreover, the transcriptome analyses reveal that the effects of kakkonto is due to the regulation of the differentiation and the activation of T cells.