There has been much concern with how long the period of diet recording needs in order to give a possible accurate estimation of the nutrient intake. Shorter record-keeping periods as have generally been prevalent, have some disadvantages since they may not include all the variations to which dietary intake is normally subjected.
Above all nutrients vitamin A and carotene are considered to have the most remarkable seasonal variation, because most of the carotene intake is dependent upon the output of vegetables.
It is the purpose of this paper to report about a dietary survey carried out for 3 days each during 12 months successively to observe the seasonal variation of nutrient intake, especially of vitamin A and carotene. Seventeen families in Yamate district of Tokyo were selected for the subjects.
The results revealed that the nutrient intake in summer and autumn were generally inferior to those of winter and spring, and about the carotene intake there were found the explicit differences among months, August indicating the lowest value, 1273 I. U. per day.
The individual survey for the housewives of the above families was also done and the calculated values of carotene ingested by those women were compared with those chemically analyzed. The latter were about 23% less than the former on an average.
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