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Riboflavin Metabolism of Young Women on Self-Selected Diets

School of Home Economics, North Texas State College, Denton

The riboflavin intake in food and excretion in urine of a group of 9 college women on self-selected diets were determined chemically. The fecal output of 5 of these subjects was also determined.

The average daily riboflavin intake, exclusive of the supplement given in ne experimental period, ranged from 1,247 to 2,469 µg.

The average daily urinary excretion of riboflavin on these intakes ranged from 36% to 51% of the intake.

Following a 5-mg supplement of riboflavin, one subject returned 24%; three returned 32% to 36%; and one returned 44%.

The average daily fecal output of 5 subjects ranged from 515 to 954 µg, with a mean average of 682 µg.

The total of the average daily fecal output and urinary excretion of riboflavin was less than the intake in all instances.

Manuscript received 7 February 1949.