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Related Experiment Videos

A very low intake of fat is required to decrease fecal bile acid concentrations in rats

W C Chang1, J R Lupton, W Frølich

  • 1Faculty of Nutrition, Texas A&M University, College Station 77843.

The Journal of Nutrition
|February 1, 1994
PubMed
Summary
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Reducing dietary fat to 5g/100g significantly decreased fecal bile acids and colonic cell proliferation in rats. Lowering fat from 20g to 10g showed no significant effect on these markers.

Area of Science:

  • Nutrition Science
  • Gastroenterology
  • Cancer Research

Background:

  • Dietary fat intake is a significant factor in colon cancer development.
  • Fecal bile acids and colonic cell proliferation are key biomarkers for colon carcinogenesis.

Purpose of the Study:

  • To investigate the impact of varying dietary fat levels on colonic cell proliferation and fecal bile acid concentrations.
  • To determine the threshold of dietary fat reduction necessary to influence these biomarkers.

Main Methods:

  • Thirty-nine male Sprague-Dawley rats were fed diets with 5%, 10%, or 20% butter for 3 weeks.
  • Fecal fat excretion, fecal bile acid concentrations, and colonic cell proliferation (labeling index) were measured.

Main Results:

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  • Total fecal fat excretion remained constant across all dietary fat groups.
  • Reducing dietary fat from 20% to 10% did not significantly alter fecal bile acid concentrations or colonic cell proliferation.
  • A reduction to 5% dietary fat significantly decreased total fecal bile acids by 48% and reduced the deoxycholate concentration and cecal labeling index.

Conclusions:

  • Dietary fat reduction to 5% is necessary to significantly decrease fecal bile acids and colonic cell proliferation, suggesting a potential protective effect against colon cancer.
  • Moderate reductions in dietary fat (e.g., 20% to 10%) do not appear to impact these critical biomarkers for colon carcinogenesis.