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Decreased Absorption of Calcium, Magnesium, Zinc and Phosphorus by Humans due to Increased Fiber and Phosphorus Consumption as Wheat Bread¹

Medical Research Unit, Institute of Nuclear Medicine, Nemazee Hospital, and the Departments of Biochemistry and Medicine, School of Medicine, Pahlavi University, Shiraz, Iran

During a 20 day period of high fiber consumption in the form of bread made partly from wheaten wholemeal, two men developed negative balances of calcium, magnesium, zinc and phosphorus due to increased fecal excretion of each element. The fecal losses correlated closely with fecal dry matter and phosphorus. Fecal dry matter, in turn, was directly proportional to fecal fiber excretion. Balances of nitrogen remained positive. Mineral elements were well-utilized by the same subjects during a 20 day period of white bread consumption.

KEY WORDS: • bread • calcium • fiber • magnesium • phosphorus • zinc

¹ A preliminary report was given at the Sixth Pahiavl Medical Congress held in Shiraz in April 1975.

² Present address: Apdo. Postale 20, Ajijic, Jallsco, Mexico.

³ Present address: School of Public Health, UCLA, Los Angeles, Calif. 90024.

⁴ To whom requests for reprints should be addressed.

Manuscript received 16 September 1975.

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