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Urinary excretion of magnesium and calcium as an index of absorption is not affected by lactose intake in healthy adults

  • Elizabeth J. Brink (a1), Emerentia C. H. van Beresteijn (a1), Pieter R. Dekker (a1) and Anton C. Beynen (a2)

Abstract

The effect of lactose on the urinary excretion of Mg and Ca, as an index of absorption, was studied in a double-blind, crossover study during three 1-week periods. Twenty-four healthy, lactose-tolerant, adult volunteers maintained their habitual diets with the exception that all lactose-containing dairy products in the diet were replaced by 600 g/d of three specially prepared dairy products. These products were based on either lactose-enriched cow's milk or lactose-enriched, lactase (EC 3.2.1.23)-treated cow's milk, with or without added Mg, and were given in turn during 1 week. Lactose intake was increased by 127 mmol/d (46 g/d) while taking the lactose-enriched products. While taking the Mg-enriched products, Mg intake was increased by 2.8 mmol/d (69 mg/d) which was equivalent to 17% of the habitual Mg intake. Apart from the lactose and Mg intake, nutrient intake was comparable during the three dietary periods. Urinary excretions of Mg and Ca were used as indicators for their absorption. Mg supplementation significantly increased urinary Mg excretion by 0.97 mmol/d (equivalent to an increase of 18%, P < 0.001), indicating that urinary Mg excretion is a valid indicator for intestinal Mg absorption. Hydrolysis of lactose did not affect urinary excretion of Mg and Ca, which implies that lactose intake does not affect the absorption of Mg and Ca in healthy adults.

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References

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Keywords

Urinary excretion of magnesium and calcium as an index of absorption is not affected by lactose intake in healthy adults

  • Elizabeth J. Brink (a1), Emerentia C. H. van Beresteijn (a1), Pieter R. Dekker (a1) and Anton C. Beynen (a2)

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