|Vormann J, Anke M|
Dietary Magnesium: Supply, Requirements and Recommendations - Results From Duplicate and Balance Studies in Man
Journal of Clinical and Basic Cardiology 2002; 5 (1): 49-53
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Keywords: balance, Diät, magnesium, Nahrungsergänzung, balance, diet, human, magnesium, supplement
The average magnesium uptake recommendation for an adult is in the range of 300 to 400 mg/day. During recent years dietary reference intakes in the USA and also in Germany/Austria/Switzerland have been slightly increased from the respective nutrition societies up to 400 mg/day for young men. The basis for these recommendations, among others, are balance studies. During the last years a series of balance and duplicate studies have been performed to determine magnesium uptake and balance in German and Mexican adults, in vegetarians, and in lactating women. In addition, the effect of supplementing a normal diet with 100 mg magnesium from a multimineral/multivitamin preparation was tested in a double blind, placebo controlled study in young women and in women during lactation. Daily magnesium intake from a self-selected diet in Germany was determined in duplicate studies in 1988/1992/1996 to be about 200 mg for women and 250 mg for men. Compared to these data a self-selected Mexican diet provided an average of 301 mg magnesium/day to women and 318 mg to men. Female and male vegetarians consumed 376 respective 474 mg magnesium/day. Balance studies that were performed over a period of 7 days showed no significant net uptake or net loss of magnesium. Supplementing the daily diet with 100 mg magnesium also did not lead to a changed balance. The higher intake was reflected by an increased urinary magnesium excretion, showing that about 20 to 40 % of the additional magnesium had been absorbed. Serum magnesium concentrations were not changed in young lactating and non-lactating women. In addition to these magnesium balance studies in various test populations it could be shown that during aging a significant amount of magnesium (up to 50 %) is lost from the bones which represents the main storage compartment for magnesium.