Some Factors Influencing the Fecal Elimination of Thiamine by Human Subjects

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Abstract
The ingestion of large amounts of plant fiber (pineapple) tended to be associated with relatively large fecal thiamine eliminations. Interference with absorption was not indicated so much as stimulation of intestinal synthesis of thiamine. In general, no correlation was found between variations in urinary and fecal thiamine output for high and low fiber periods, even when there existed in the fecal output a difference great enough so that variations in urinary excretion might be reflected. There were indications that in certain subjects there was destruction of considerable amounts of thiamine in the digestive tract.

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