for vitamin C, vitamin E, and selenium from NHANES III, adjusted by methods described by the National Research Council (NRC, 1986) and by Feinleib et al. (1993) for persons aged 6 years and older. Appendix E provides means and selected percentiles of dietary intakes of vitamin C for individuals in Québec and Nova Scotia.

Sources of Supplement Intake Data

Although subjects in the CSFII are asked about the use of dietary supplements, quantitative information is not collected. Data on supplement intake obtained from NHANES III were reported as a part of total nutrient intake (Appendix C). NHANES III data on overall prevalence of supplement use are also available (LSRO/FASEB, 1995). In 1986, the National Health Interview Survey queried 11,558 adults and 1,877 children on their intake of supplements during the previous 2 weeks (Moss et al., 1989). The composition of the supplement was obtained directly from the product label whenever possible. Table 3-2 shows the percentage of adults, by age, taking supplements of vitamin C, vitamin E, or selenium.

SOURCE: Moss et al. (1989).

Food Sources of Vitamin C, Vitamin E, Selenium, and Carotenoids

For some nutrients in this report, two types of information are provided about food sources of nutrients: identification of the foods that are the major contributors of the nutrient to diets in the United States and food sources of the nutrient. The determination of foods that are major contributors depends on both the nutrient

TABLE 3-2 Percentage of Persons Taking Vitamin Supplements by Sex, Age, and Type of Vitamin Used: National Health Interview Survey, United States, 1986

 

Females

Males

 

All Adults

All Adults

Supplement Taken

18+ y

18–44 y

45–64 y

65+ y

18+ y

18–44 y

45–64 y

65+ y

Vitamin C

33.6

32.7

35.7

33.3

27.8

27.7

28.4

27.2

Vitamin E

28.9

28.5

30.3

27.9

23.1

22.4

24.4

23.9

Selenium

10.3

10.5

10.2

10.2

8.1

8.3

7.1

8.7

NOTE: The high use of supplements by pregnant women is not reflected in this table.



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