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Related Experiment Videos

Low-fat, high-carbohydrate and high-fat, low-carbohydrate diets decrease primary bile acid synthesis in humans.

Peter H Bisschop1, Robert H J Bandsma, Frans Stellaard

  • 1Department of Endocrinology & Metabolism, Academic Medical Center, University of Amsterdam, Netherlands. p.h.bishop@amc.uva.nl

The American Journal of Clinical Nutrition
|March 31, 2004
PubMed
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Dietary fat content significantly impacts primary bile salt metabolism in humans. Both low-fat and high-fat diets reduce bile salt synthesis and turnover, affecting cholesterol removal.

Area of Science:

  • Human metabolism
  • Bile salt biochemistry
  • Nutritional science

Background:

  • Dietary fat intake is known to influence bile salt metabolism.
  • Quantitative data from controlled human studies are limited.

Purpose of the Study:

  • To determine the precise effects of varying dietary fat content on the metabolism of primary bile salts in humans.

Main Methods:

  • Employed stable isotope dilution techniques in 6 healthy men over 11 days.
  • Assessed kinetic values of cholate and chenodeoxycholate metabolism under eucaloric extremely low-fat (0%), intermediate-fat (41%), and extremely high-fat (83%) diets.
  • Maintained identical cholesterol content across all diets.

Main Results:

  • While total primary bile salt pool size remained unaffected, the chenodeoxycholate pool was larger on the low-fat diet.

Related Experiment Videos

  • Fractional turnover rates for both primary bile salts decreased by 30-50% on low- and high-fat diets compared to the control.
  • Total hepatic bile salt synthesis was reduced by approximately 30% on both extreme diets, with differential effects on individual bile salt synthesis rates.
  • The ratio of cholate to total bile salt synthesis increased with fat intake, while the ratio of chenodeoxycholate decreased.
  • Increased plasma deoxycholate during the low-fat period suggested enhanced colonic absorption.

    • Conclusions:

    • Both extremely low-fat and extremely high-fat diets demonstrably reduce the synthesis and turnover rates of primary bile salts in humans.
    • These dietary interventions likely impact cholesterol removal through distinct underlying mechanisms.
    • The findings highlight the significant role of dietary fat composition in regulating bile salt dynamics and cholesterol homeostasis.