content of a food and the total consumption of that food (amount and frequency). Therefore, a food that has a relatively low concentration of the nutrient might still be a large contributor to total intake if it is consumed in relatively large amounts. In contrast, the food sources listed are those with the highest concentration of the nutrient; no consideration is given to the amount consumed.

SUMMARY

General methods for examining and interpreting the evidence on requirements for vitamin C, vitamin E, and selenium, with special attention given to infants, children, and pregnant and lactating women; methodological problems; and dietary intake data are presented in this chapter. Relevant detail is provided in the nutrient chapters.

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