The Relationship of dietary protein, protein type, and magnesium to urinary magnesium excretion in the human
1984
Shier, Nathan W. | Myers, Merrianne Asbury
Extract: Five adult Caucasian males participated in a free-living study to determine whether a relationship exists between urinary magnesium excretion and dietary protein types and amounts. All food and water consumed was recorded for 1 week with 24-hour urine specimens taken daily. Any incomplete diet records or urine samples were discarded. Nutrient intake was determined using standard food composition tables, research articles and composition data supplied by food companies. Urinary magnesium was estimated using an atomic absorption spectrophotometer. The mean daily protein and magnesium intakes were 100 gm and 339.6 mg, respectively. The mean daily plant protein intake was 27 gm while animal protein averaged 73 gm. The mean 24-hour urinary magnesium excretion was 97.7 mg with an average urine volume of 1330 ml. There was no significant relationship between dietary protein (total, animal, plant) and the amount of magnesium lost through urinary excretion. The correlations between protein and urinary magnesium are: total protein r = -0.3393, plant r = 0.1777 and, for animal, r = -0.4523. There was a significant, positive relationship between dietary magnesium and urinary magnesium with a correlation of 0.4434, P = 0.04. Since magnesium intakes increased as protein intakes increased (r = 0.4640), but, at the same time, magnesium urinary excretion decreased, it is concluded that magnesium retention may be improved by dietary protein and animal protein. At least there does not appear to be a detrimental effect as seen in the protein calcium interaction. Because of the positive relationship between plant protein and urinary magnesium, it is suggested that magnesium balance studies be done in strict vegetarians. (author)
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