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Related Experiment Videos

Zinc and copper in self-selected diets.

J M Holden, W R Wolf, W Mertz

    Journal of the American Dietetic Association
    |July 1, 1979
    PubMed
    Summary

    Many individuals have insufficient zinc and copper intake, even with adequate protein and calorie consumption. This study highlights low nutrient density for these essential trace elements in typical diets.

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    Area of Science:

    • Nutritional Science
    • Trace Element Metabolism
    • Dietary Analysis

    Background:

    • Adequate intake of essential minerals like zinc and copper is crucial for human health.
    • Dietary patterns significantly influence the bioavailability and sufficiency of trace elements.
    • Assessing nutrient density beyond macronutrients is vital for comprehensive dietary evaluation.

    Purpose of the Study:

    • To determine zinc and copper levels in self-selected diets.
    • To evaluate the nutrient density of zinc and copper relative to calorie intake.
    • To assess if adequate energy and protein intake guarantees sufficient zinc and copper levels.

    Main Methods:

    • Atomic absorption spectrophotometry was used to quantify zinc and copper concentrations.
    • Dietary intake was assessed through self-selected food consumption patterns.
    • Metallo:calorie ratios were calculated and compared against recommended allowances.

    Main Results:

    • 68% of subjects consumed less than two-thirds of the recommended zinc allowance (15 mg).
    • 81% of subjects consumed less than two-thirds of the suggested copper level (2.0 mg).
    • Observed zinc:calorie and copper:calorie ratios were significantly lower than recommended nutrient densities.

    Conclusions:

    • Self-selected diets often provide inadequate levels of zinc and copper.
    • Diets rich in protein and calories do not necessarily ensure sufficient intake of these critical trace elements.
    • Low metallo:calorie ratios suggest a need for dietary strategies to improve zinc and copper nutrient density.

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