Category	Age (yr) or Condition	Weight b		Height		Protein (g)	Vitamin A (μg RE ) c	Vitamin E (mg α-TE) e	Vitamin K (μg)	Vitamin C (mg)	Iron (mg)	Zinc (mg)	Iodine (μg)	Selenium (μg)
		(kg)	(lb)	(cm)	(in.)
Infants	0.0–0.5	6	13	60	24	9.1	400	4	2.0	40	0.27	2	110	15
	0.5–1.0	9	20	71	28	13.5	500	5	2.5	50	11	3	130	20
Children	1–3	13	29	90	35	13	300	6	30	15	7	3	90	20
	4–8	20	44	112	44	19	400	7	35	25	10	5	90	30
Male	9–13	45	99	157	62	34	600	11	60	45	8	8	120	40
	14–18	66	145	176	69	52	900	15	75	75	11	11	150	50
	19–30	72	160	177	70	56	900	15	120	90	8	11	150	55
	31–50	79	174	176	70	56	900	15	120	90	8	11	150	55
	51+	77	170	173	68	56	900	15	120	90	8	11	150	55
Female	9–13	46	101	157	62	34	600	11	60	45	8	8	120	40
	14–18	55	120	163	64	46	700	15	75	65	15	9	150	55
	19–30	58	128	164	65	46	700	15	90	75	18	8	150	55
	31–50	63	138	163	64	46	700	15	90	75	18	8	150	55
	51+	65	143	160	63	46	700	15	90	75	8	8	150	55
Pregnant					60	71	770	15	90	85	27	11	220	60
Lactating	1st 6 months				71		1300	19	90	120	9	12	290	70
	2nd 6 months				71		1200	19	90	120	9	12	290	70

^aThe allowances, expressed as average daily intakes over time, are intended to provide for individual variations among most normal persons living in the United States under usual environmental stresses. Diets should be based on a variety of common foods in order to provide other nutrients for which human requirements have been less well defined.
^bWeights and heights of reference adults are actual medians for the U.S. population of the designated age, as reported by NHANES II [second National Health and Nutrition Examination Survey]. The median weights and heights of those under 19 years of age were taken from Hamill et al. [Physical Growth: National Center for Health Statistics percentiles. Am J Clin Nutr 32:607, 1979]. The use of these figures does not imply that the height-to-weight ratios are ideal.
^cRetinol equivalents. 1re = 1 μg retinol or 6 μg beta-carotene.
^eAlpha-tocopherol equivalents. 1 mg d-alpha tocopherol = 1 alpha-te.
SOURCE: From National Research Council. Dietary Reference Intakes: Applications in Dietary Assessment, Copyright 2000 and Dietary Reference Intakes: Applications in Dietary Planning, Copyright 2003 by the National Academy of Sciences. Revised 2004. Courtesy of the National Academy Press, Washington, DC. www.nap.edu