Historically, Beriberi has been endemic in regions dependent on White Rice in order to extend its lifespan, which has the unintended side-effect of removing the primary source of thiamine.
Historically, Beriberi has been endemic in regions dependent on polished rice. This refers to the practice of de-husking rice in order to extend its lifespan, which has the unintended side-effect of removing the primary source of thiamine.