Abstract
Daily intake ot nuorine from Japanese rural diet was estimated. The estimated amount of fluorine was 3.708mg in 1958 and in 1965, 8.819mg. Fluorine intake was low in summer and high in winter. The chief source of fluorine was rice, supplying 50.6% of the total intake in 1958 and 57.8% in 1965. Vegetative foods supplied 8.3% of fluorine intake in 1958 and 21.2% in 1965. Among the other sources of fluorine were bean paste and drinking water. The amount of fluorine obtained from drinking water was, however, insignificant.
