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The D-xylose absorption test in different ethnic groups.

G C Cook

    Tropical and Geographical Medicine
    |March 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Environmental factors, not genetics, explain abnormal xylose absorption tests in tropical populations. This study found similar xylose excretion across England, Saudi Arabia, and Zambia, indicating shared environmental influences on nutrient absorption.

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    Area of Science:

    • Nutritional science
    • Human physiology
    • Medical research

    Background:

    • Xylose absorption tests are used to assess gastrointestinal function.
    • Previous studies suggested a genetic basis for variations in xylose absorption in tropical regions.

    Purpose of the Study:

    • To investigate the basis of abnormal xylose absorption tests in diverse populations.
    • To differentiate between environmental and genetic factors influencing xylose absorption.

    Main Methods:

    • Oral xylose tolerance tests (25g load) were administered to 59 hospital inpatients across England, Saudi Arabia, and Zambia.
    • Urinary xylose excretion (5-hour) and blood xylose concentration (90-minute) were measured.
    • Participants were from urban environments with no significant organic disease.

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    Main Results:

    • Mean urinary xylose excretion was comparable across English, Asian, and African participants.
    • No significant differences in xylose absorption were observed between ethnic groups.
    • The findings challenge the notion of a genetic predisposition to malabsorption.

    Conclusions:

    • The high incidence of abnormal xylose absorption tests in tropical indigenous populations is attributable to environmental factors.
    • Genetic factors do not appear to be the primary cause of impaired xylose absorption in these populations.
    • Environmental influences play a crucial role in nutrient absorption and gastrointestinal health.