2009 Nutritive aspects of foods (pt 3)

2009 Nutritive aspects of foods (pt 3) - Bioavailability...

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Bioavailability and nutrition labeling
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1989 RDA (basis for the “ % Daily Value ” ) Premenopausal women: 15 mg dietary Fe / day Adult men 10 mg dietary Fe / day 1989 RDA assumes: Average food Fe absorption efficiency of 10 – 15% This value is applied to all foods Average physiological 1.5 mg absorbed Fe / day (women) need for Fe : 1.0 mg absorbed Fe / day (men) (sufficient to replace daily Fe loss) How much food Fe is required to provide 1.5 (or 1.0) mg absorbed Fe ? How were these values derived ? (1) (2)
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= 160% of 15 mg food Fe = 24 mg food Fe / serving of Wheaties (Fe content ) RDA (premenopausal women) = 15 mg food Fe / day = amount of dietary (food) Fe considered equivalent to 1.5 mg absorbed Fe (the average physiological need) Actual absorption of elemental (powder) Fe = 2.4 % Absorbed Fe / serving Wheaties = 2.4 % of 24 mg Fe = 0.58 mg absorbed Fe / serving Wheaties = 38% of the physiological need What does “160 % of Daily Value” mean ? “ % Daily Value”
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2009 Nutritive aspects of foods (pt 3) - Bioavailability...

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