Arsenic is in food as well as water, but researchers say a typical daily diet contains only 10 to 15 micrograms of inorganic arsenic -- the compouds that are hazardous (food contains much more organic arsenic, but that form passes harmlessly through the body). ... "The standard for arsenic should be as close to zero as possible."
――奈良県立医科大学 医学部 医学科 前期日程 ――2002年