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Related Experiment Video

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Author Spotlight: Establishing MASLD Cell Models for Investigating Disease Mechanisms and the Lipid-Lowering Effects of Koumiss
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High-viscosity dietary fibers reduce adiposity and decrease hepatic steatosis in rats fed a high-fat diet.

David A Brockman1, Xiaoli Chen1, Daniel D Gallaher2

  • 1Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN.

The Journal of Nutrition
|July 4, 2014
PubMed
Summary

Viscous dietary fibers, including hydroxypropyl methylcellulose (HPMC) and guar gum (GG), effectively reduce obesity and fatty liver in diet-induced obesity models. These fibers enhance metabolic flexibility, improving the body's ability to switch between fat and carbohydrate oxidation.

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Area of Science:

  • Nutrition Science
  • Metabolic Health
  • Dietary Fiber Research

Background:

  • Viscous dietary fiber consumption is known to lower postprandial glucose and may mitigate obesity and related conditions like insulin resistance and fatty liver.
  • The specific effects of fermentable versus non-fermentable viscous fibers on metabolic health remain an area of active investigation.

Purpose of the Study:

  • To investigate the impact of two distinct viscous dietary fibers—one fermentable (guar gum, GG) and one non-fermentable (hydroxypropyl methylcellulose, HPMC)—on the development of adiposity, fatty liver, and metabolic flexibility in a rat model of diet-induced obesity.
  • To compare the effects of these viscous fibers against a non-viscous, non-fermentable fiber (cellulose, CL) and a normal-fat diet control.

Main Methods:

  • Rats were assigned to diets: normal-fat (NF), high-fat with cellulose (HF-CL), high-fat with HPMC (HF-HPMC), or high-fat with GG (HF-GG) for 10 weeks.
  • Measurements included body composition (fat mass percentage), epididymal fat pad weight, liver lipid concentration, and ex vivo muscle palmitate oxidation.
  • Metabolic flexibility was assessed by measuring the respiratory quotient during the transition from a fasted to a fed state.

Main Results:

  • Both HPMC and GG significantly reduced fat mass percentage, epididymal fat pad weight, and liver lipid concentration compared to cellulose in high-fat fed rats.
  • No significant differences in these parameters were observed between the NF, HF-HPMC, and HF-GG groups.
  • The GG group exhibited a quicker shift towards carbohydrate oxidation (higher respiratory quotient), while the HPMC group showed enhanced ex vivo muscle fatty acid oxidation capacity.

Conclusions:

  • Viscous dietary fibers, irrespective of their fermentability, can effectively reduce adiposity and hepatic steatosis associated with high-fat diets.
  • Consumption of viscous fibers promotes metabolic flexibility, enhancing the body's adaptive response to nutrient availability.