EAR for Boys

14 through 18 years

340 mg (14.2 mmol)/day

EAR for Girls

14 through 18 years

300 mg (12.5 mmol)/day

Based on the 1994 CSFII intake data, adjusted for day-to-day variation (Nusser et al., 1996), the magnesium EAR of 345 mg (14.4 mmol)/day for boys ages 14 through 18 years is above the median intake of 301 mg (12.5 mmol)/day and below the seventy-fifth percentile of intake, 372 mg (15.5 mmol)/day (see Appendix D). For girls in this age range, the EAR for magnesium of 300 mg (12.5 mmol)/day is just above the ninetieth percentile of intake, 296 mg (12.3 mmol)/day.

Determination of the RDA: Ages 14 through 18 Years

The variance in requirements cannot be determined from the available data. Thus, a CV of approximately 10 percent is assumed for each EAR. This results in an RDA for magnesium of 410 mg (17.1 mmol)/day for boys ages 14 through 18 years and an RDA for magnesium of 360 mg (15.0 mmol)/day for girls ages 14 through 18 years when rounded.

RDA for Boys

14 through 18 years

410 mg (17.1 mmol)/day

RDA for Girls

14 through 18 years

360 mg (15.0 mmol)/day

Ages 19 through 30 Years
Indicators Used to Set the EAR for Men

Balance Studies. The results of studies that have looked at magnesium balance in men and women aged 19 through 30 years in various situations are included in Table 6-2. As with the balance studies conducted in adolescents, no estimates or measurements of other losses of magnesium (due to dermal, sweat, etc.) are included. Since few references are available to estimate these losses, gross balances are presented. In the controlled diet study (Greger and Baier, 1983), which was designed to look at the influence of aluminum on mineral balances, men (25 ± 3 years) were in positive balance on average intakes of 447 mg (18.6 mmol) from food and dietary supplements. This represents 6.4 mg (0.27 mmol)/kg/day for these subjects, but may overestimate requirements as only one level was given.

Another controlled study, this one designed to look at the effect of bran on mineral requirements, was conducted in seven men aged

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