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Related Experiment Videos

Problems with estimating vitamin C intakes

R Sinha1, G Block, P R Taylor

  • 1Division of Cancer Prevention and Control, National Cancer Institute, Bethesda, MD 20892.

The American Journal of Clinical Nutrition
|April 1, 1993
PubMed
Summary
This summary is machine-generated.

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See all related articles

New HPLC analysis revealed lower vitamin C in key foods, impacting dietary intake estimates. However, this accuracy may not alter rankings in population studies on vitamin C and plasma ascorbic acid.

Area of Science:

  • Nutrition Science
  • Food Analysis
  • Biochemistry

Background:

  • Accurate estimation of dietary vitamin C intake is crucial for public health and nutritional research.
  • Existing national databases may not reflect the precise vitamin C content of various foods.
  • High-performance liquid chromatography (HPLC) offers a more accurate method for quantifying vitamin C.

Purpose of the Study:

  • To compare vitamin C values in common foods using national databases versus HPLC analysis.
  • To assess the impact of updated vitamin C values on estimated dietary intake.
  • To evaluate the effect of revised intake data on the correlation between diet and plasma ascorbic acid levels.

Main Methods:

  • Analysis of vitamin C content in selected foods using HPLC.

Related Experiment Videos

  • Comparison of HPLC-derived values with existing data from two national food composition databases.
  • Substitution of HPLC values into the Health Habits and History Questionnaire for two dietary studies.
  • Correlation analysis between estimated dietary vitamin C intake and plasma ascorbic acid levels.

    • Main Results:

    • HPLC analysis yielded lower vitamin C values for major contributors to the US diet, including orange juice, grapefruit, tomatoes, potatoes, broccoli, red peppers, and greens.
    • Dietary vitamin C intake estimates were reduced in two studies when using HPLC-derived food values.
    • Despite lower absolute intake estimates, the correlation between dietary vitamin C and plasma ascorbic acid remained similar in one study.

    Conclusions:

    • Accurate food composition data, particularly for vitamin C, is essential for precise population intake estimations.
    • While updated values lower absolute intake figures, they may not significantly alter individual rankings in epidemiological studies assessing vitamin C status.
    • Further research using validated analytical methods like HPLC is recommended for refining nutritional databases.