TABLE 6-4 Magnesium (Mg) Balance Studies in Men and Women Aged 51 through 70 Years

Author, Year

n

Age (y)

Adaptation Period (d)

Balance Period (d)

Average Daily Mg Intake (mean ± SEM)

Balance (mg/d) (mean ± SEM)

Comments

Males

Kelsay et al., 1979

12

37–58

19

7

356 ± 10 mg

28 ± 17

4.9 g fiber from fruit and vegetable juices; Mg and iron added to be equivalent to higher fiber test diet.

     

19

7

322 ± 12 mg

−32 ± 10

23.8 g fiber from fruits and vegetables.

Kelsay and Prather, 1983

12

34–58

21

7

308 ± 10 mg

20 ± 14

4.9 ± 0.4 g fiber including spinach.

     

21

7

350 ± 7 mg

−10 ± 13

26.5 ± 0.6 g fiber with spinach.

     

21

7

356 ± 10 mg

18 ± 13

24.0 ± 0.6 g fiber with cauliflower substituted for spinach.

Mahalko et al., 1983

10

19–64

16

12 (6 2x)

229 ± 24 mgb

13 ± 30b

65 g/d protein.

       

12

258 ± 24 mgb

17 ± 36b

94 g/d protein.

Spencer et al., 1994

5

38–75

28

40

264 ± 26 mg

−23 ± 21

241 mg/d Ca.

       

32

240 ± 24 mg

−26 ± 14

812 mg/d Ca.

       

28

826 ± 37 mg

23 ± 24

241 mg/d Ca.

       

39

798 ± 28 mg

48 ± 24

812 mg/d Ca.

Schwartz et al., 1984

8

53 ± 5

30

6

381 ± 36 mg (5.7 mg/kg)

25 ± 15

Balance was positive in all subjects.

Femalesa

a No studies have been reported in females in this age group.

b Mean ± SD.



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