Analyses for trace elements were made on diets and excreta of two subjects on ad libitum diets for 30 days. The intake of each element was essentially the same for the two individuals. For the essential elements calcium, iron, magnesium and phosphorus the subjects were in balance and the patterns of excretion were the same. For minor trace elements, essential and nonessential, the excretory patterns differed widely. Estimates ofh for strontium based on fecal and urinary excretion gave values of 0.50 and 0.39; estimates based on urinary excretion gave values of 0.26 and 0.5 1.T o OBTAIN an idea of the average amounts and day-today variations of trace elements in ordinary diets and excreta, the Trace Elements Laboratory in the Physics Department of the University of Tennessee with the cooperation of the Nutrition Department of the University of Tennessee set up a 30-day study from 12 June through 11 July, 1963.Two subjects, husband and wife, ages 35 and 34, who for several years had maintained weights of-1 65 and -1 36 lb respectively saved carefully weighed duplicate samples of all food ingested and all excreta. All fluids except water, tea and coffee were included in the daily samples of food. A record was kept of the daily intake of water, tea and coffee, and samples of each were supplied for analyses.Although the diets were basically the same for
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