TABLE 6-2 Magnesium (Mg) Balance Studies in Men and Women Aged 19 through 30 Years

Study, Year

n

Age (y)

Adaptation Period (d)

Balance Period (d)

Average Daily Mg Intake

Balance (mg/d)

Comments

Males

Greger and Baier, 1983

8

25 ± 3

12

6

Avg. 447 mg (6.4 mg/kg)

−1 ± 8

6.4 mg/kg maintained balance but adaptation period was too short.

Lakshmanan et al., 1984

9

20–35

N/A

Four 1-wk periods over 1 y

Self-selected; 190–595 mg (avg. 333 ± 120 mg) (avg. 4.3 mg/kg)

−19 ± 48

Self-selected intakes (ranging from 204 to 595 mg) sufficient to maintain balance in 4 of 9 subjects.

Schwartz et al., 1986

7

22–32

28

21

Avg. 719 ± 105 mg

27 ± 19

Intakes greater than 597 mg/d were sufficient to maintain balance in all but one subject (who received 788 mg/d).

Females

Lakshmanan et al., 1984

8

20–35

N/A

Four 1-wk periods over 1 y

Self-selected; 132–350 mg (avg. 239 ± 80 mg) (avg. 4.2 mg/kg)

−25 ± 40

Three of the 8 subjects in balance on average intakes self-selected (ranging from 213 to 304 mg).

Wisker et al., 1991

12

22–28

14

7

252 mg

7 ± 5

22.5 g/d fiber 71.8 g/d protein.

     

14

7

243 mg

−12 ± 5

38.6 g/d fiber 55.7 g/d protein.

     

14

7

245 mg

5 ± 2

38.6 g/d fiber 73.8 g/d protein.



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