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Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc
was reported to result in normalization of zinc in granulocytes and lymphocytes and improvement in various immune parameters (Prasad et al., 1993). Ethanol tolerance tests indicated a change in ethanol metabolism when dietary zinc intake of postmenopausal women was restricted to 2.6 mg/day (Milne et al., 1987).
Zinc EAR and RDA Summary, Ages 19 Years and Older
EAR for Men
19–30 years
9.4 mg/day of zinc
31–50 years
9.4 mg/day of zinc
51–70 years
9.4 mg/day of zinc
> 70 years
9.4 mg/day of zinc
EAR for Women
19–30 years
6.8 mg/day of zinc
31–50 years
6.8 mg/day of zinc
51–70 years
6.8 mg/day of zinc
> 70 years
6.8 mg/day of zinc
The RDA for zinc is set by using a CV of 10 percent (see Chapter 1) because information is not available on the standard deviation of the requirement. The RDA is defined as equal to the EAR plus twice the CV to cover the needs of 97 to 98 percent of the individuals in the group (therefore, for zinc the RDA is 120 percent of the EAR). The calculated RDA was rounded to the nearest 1 mg.
