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Lactose and milk intolerance: clinical implications.

T M Bayless, B Rothfeld, C Massa

    The New England Journal of Medicine
    |May 29, 1975
    PubMed
    Summary
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    Lactose intolerance is common in adults, affecting 81% of Black patients and leading to digestive symptoms like gas and cramps after consuming milk or lactose. This condition is clinically significant and impacts dietary choices.

    Area of Science:

    • Gastroenterology
    • Human Physiology
    • Clinical Nutrition

    Background:

    • Lactose intolerance is widely assumed to affect a majority of the global adult population.
    • Understanding its clinical relevance in hospitalized patients is crucial for effective management.

    Purpose of the Study:

    • To determine the clinical significance of lactose intolerance diagnosed via tolerance testing in hospitalized male patients.
    • To assess the prevalence of lactose intolerance across different ethnic groups.

    Main Methods:

    • Conducted lactose tolerance tests on 166 hospitalized male patients.
    • Administered low-fat milk and pure lactose to assess symptomatic responses.
    • Correlated test results with self-reported symptoms and milk consumption habits.

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    Main Results:

    • Abnormal lactose tolerance tests were observed in 81% of Black patients and 12% of White patients.
    • 72% of "lactose-intolerant" subjects recognized milk-induced gastrointestinal symptoms.
    • Milk or lactose consumption caused symptoms in 59-68% of "lactose-intolerant" men, but not in "lactose-tolerant" men.

    Conclusions:

    • Lactose intolerance is a prevalent condition in adult patients.
    • It is clinically relevant, manifesting as noticeable gastrointestinal symptoms and influencing dietary behavior.
    • Higher prevalence observed in Black patients compared to White patients.