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aWhen not exposed to sunshine (400IU ~ 10 mg). bSmall amount needed when not exposed to sunshine.

cUnit changed from RE (Retinol Equivalent) to RAE (Retinol Activity Equivalent). "Adequate Intake (AI), not RDA. eAs «-tocopherol only.

'Estimate or range, no recommendation made. gAs Dietary Folate Equivalents (DFE).

From the Food and Nutrition Board, US National Research Council/Institute of Medicine.

aWhen not exposed to sunshine (400IU ~ 10 mg). bSmall amount needed when not exposed to sunshine.

cUnit changed from RE (Retinol Equivalent) to RAE (Retinol Activity Equivalent). "Adequate Intake (AI), not RDA. eAs «-tocopherol only.

'Estimate or range, no recommendation made. gAs Dietary Folate Equivalents (DFE).

From the Food and Nutrition Board, US National Research Council/Institute of Medicine.

Table 5 Possible indicators or criteria to evaluate adequacy of iron intakes

Erythrocyte indexes Erythrocyte protoporphyrin levels Factorial modeling

Hemoglobin concentration and hematocrit

Iron balance studies3

Plasma total iron binding capacity

Serum ferritin concentration

Soluble serum transferrin receptor levels

Serum transferrin saturation aBalance studies measure or estimate total excretion of a nutrient at different levels of intake and determine the lowest level of intake at which intake = excretion.

intakes, it is critical to know specifically the criterion or criteria used in setting the recommended intake and evaluating adequacy.

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