Metabolic responses of adolescent boys to two levels of dietary magnesium and protein. II. Effect of magnesium and protein level on calcium balance

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Abstract
Adolescent boys, 13 to 14 years old, were subjected to identical dietary treatments in each of 2 successive years. Treatments, each lasting 15 days, were: low protein, low magnesium (LPLM); low protein, high magnesium (LPHM); high protein, low magnesium, (HPLM); and high protein, high magnesium (HPHM). Calcium intake was constant throughout at 1.8 g/day. Urinary calcium excretion was significantly increased by increasing the dietary protein level. Apparent absorption was also increased, but significance of the effect was reduced by variability and a trend toward decreasing absorption with time. Changes in dietary magnesium level did not appear to affect apparent Ca absorption or urinary excretion.