TABLE 6-3Magnesium (Mg) Balance Studies in Men and Women Aged 31 through 50 Years

Study, YearnAge (y)Adaptation Period (d)Balance Period (d)Average Daily Mg Intake (mean ± SEM)Balance (mg/d) (mean ± SEM)Comments
Males
Kelsay et al., 19791237–58197356 ± 10 mg28 ± 17 4.9 g fiber from fruit and vegetable juices; Mg and iron added to be equivalent to higher fiber test diet.
197322 ± 12 mg−32 ± 1023.8 g fiber from fruits and vegetables.
Kelsay and Prather, 19831234–58217308 ± 10 mg20 ± 14 4.9 ± 0.4 g fiber including spinach.
217350 ± 7 mg−10 ± 1326.5 ± 0.6 g fiber with spinach.
217356 ± 10 mg18 ± 1324.0 ± 0.6 g fiber with cauliflower substituted for spinach.
Mahalko et al., 19831019–641612 (6 2×)229 ± 24 mga13 ± 30a65 g/d protein.
12258 ± 24 mga17 ± 36a94 g/d protein.
Spencer et al., 1994538–752840264 ± 26 mg−23 ± 21241 mg/d Ca.
32240 ± 24 mg−26 ± 14812 mg/d Ca.
28826 ± 37 mg23 ± 24241 mg/d Ca.
39798 ± 28 mg48 ± 24812 mg/d Ca.
Lakshmanan, 1984735–53N/AFour 1-wk periods over 1 ySelf-selected; 157–418 mg−48 ± 59Three in equilibrium (intakes ranging from 286 to 418 mg); 4 subjects in average negative balance (intakes ranging from 157 to 344 mg) on self-selected average intakes.
Females
Lakshmanan, 19841035–53N/AFour 1-wk periods over 1 ySelf-selected; 164–301 mg (avg 231 ± 46 mg) (avg 4.2 mg/kg)−25 ± 37Four in positive balance or at equilibrium with intakes ranging from 182 to 258 mg; 6 were in negative balance with intakes ranging from 164 to 301 mg on self-selected average intakes.
a

Mean ± SD.

From: 6, Magnesium

Cover of Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride
Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride.
Institute of Medicine (US) Standing Committee on the Scientific Evaluation of Dietary Reference Intakes.
Washington (DC): National Academies Press (US); 1997.
Copyright © 1997, National Academy of Sciences.

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