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Biliary lipid composition in obesity

B Angelin, K Einarsson, S Ewerth

    Scandinavian Journal of Gastroenterology
    |January 1, 1981
    PubMed
    Summary
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    Obesity increases cholesterol saturation in gallbladder bile, raising the risk of cholesterol gallstones. This study found higher cholesterol and lower bile acid proportions in obese subjects, explaining gallstone prevalence.

    Area of Science:

    • Gastroenterology
    • Metabolic Diseases
    • Biliary Physiology

    Background:

    • Obesity is a significant risk factor for cholesterol gallstone formation.
    • Understanding the specific changes in bile composition associated with obesity is crucial for explaining gallstone pathogenesis.

    Purpose of the Study:

    • To investigate the differences in fasting gallbladder bile composition between obese and healthy control subjects.
    • To determine if altered bile lipid profiles in obesity correlate with increased cholesterol saturation.

    Main Methods:

    • Fasting gallbladder bile was collected from gallstone-free obese individuals and age-, sex-, and lipid-matched healthy controls.
    • Bile lipid composition (cholesterol, bile acids) was analyzed using molar percentages.
    • Cholesterol saturation index of bile was calculated.

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    Main Results:

    • Obese subjects exhibited a significantly higher proportion of cholesterol (10.8% vs. 6.8%) and a lower proportion of bile acids (64.7% vs. 71.0%) in their bile compared to controls.
    • Bile cholesterol saturation was markedly elevated in obese individuals (141% vs. 96%).

    Conclusions:

    • The altered bile composition in obesity, characterized by increased cholesterol and decreased bile acids, leads to supersaturation.
    • This bile supersaturation provides a direct explanation for the increased incidence of cholesterol gallstones observed in obese populations.