A tau protein production promoter, a therapeutic drug / prophylactic drug for a disease caused by a deficiency of tau protein and a food composition for therapeutic / prophylactic use
An object of the present invention is to provide: a Tau protein production accelerator containing a natural product as an active ingredient; a therapeutic or preventive agent for a disease caused by Tau protein deficiency; and a therapeutic or preventive food composition for a disease caused by Tau protein deficiency. Provided are: a Tau protein production accelerator containing a dry powder, ground product and/or extract of an earthworm as an active ingredient; a therapeutic or preventive agent for a disease caused by Tau protein deficiency; and a therapeutic or preventive food composition for a disease caused by Tau protein deficiency. The disease caused by Tau protein deficiency is preferably Alzheimer's disease.