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Ascorbic acid intakes and plasma levels in healthy elderly.

P J Garry, D J Vanderjagt, W C Hunt

    Annals of the New York Academy of Sciences
    |January 1, 1987
    PubMed
    Summary
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    Elderly men have lower plasma ascorbic acid than women. This study suggests higher vitamin C intake for elderly men to maintain adequate levels, questioning reduced RDA recommendations.

    Area of Science:

    • Gerontology
    • Nutritional Science
    • Biochemistry

    Background:

    • Ascorbic acid (vitamin C) is essential for health.
    • Adequate nutrient intake is crucial for the elderly population.
    • Current Recommended Dietary Allowances (RDAs) for vitamin C may need re-evaluation in older adults.

    Purpose of the Study:

    • To investigate sex differences in plasma ascorbic acid concentrations in the elderly.
    • To evaluate the adequacy of current vitamin C intake recommendations for older adults.
    • To propose optimal ascorbic acid intake levels for elderly men and women.

    Main Methods:

    • Comparison of plasma ascorbic acid levels between elderly men and women.
    • Analysis of plasma ascorbic acid concentrations relative to dietary intake.

    Related Experiment Videos

  • Assessment of renal tubular reabsorption as a potential factor.

    • Main Results:

    • Elderly men exhibited significantly lower plasma ascorbic acid than elderly women at similar intake levels.
    • Over half of healthy elderly men had plasma levels below 0.3 mg/dl with intakes of 40-50 mg/day.
    • Hypothesized lower renal tubular reabsorption in men contributes to lower concentrations.

    Conclusions:

    • Current RDA reductions for vitamin C in the elderly are questionable.
    • Higher daily intakes of approximately 125 mg for men and 75 mg for women are suggested to maintain plasma levels near 1.0 mg/dl.
    • These proposed intakes aim to ensure adequate ascorbic acid body reserves in the elderly.