Insoluble Dietary Fiber from Pear Pomace Can Prevent High-Fat Diet-Induced Obesity in Rats Mainly by Improving the Structure of the Gut Microbiota

J Microbiol Biotechnol. 2017 Apr 28;27(4):856-867. doi: 10.4014/jmb.1610.10058.


Supplement of dietary fibers (DF) is regarded as one of the most effective way to prevent and relieve chronic diseases caused by long-term intake of a high-fat diet in the current society. The health benefits of soluble dietary fibers (SDF) have been widely researched and applied, whereas the insoluble dietary fibers (IDF), which represent a higher proportion in plant food, were mistakenly thought to have effects only in fecal bulking. In this article, we proved the anti-obesity and glucose homeostasis improvement effects of IDF from pear pomace at first, and then the mechanisms responsible for these effects were analyzed. The preliminary study by real-time PCR and ELISA showed that this kind of IDF caused more changes in the gut microbiota compared with in satiety hormone or in hepatic metabolism. Further analysis of the gut microbiota by high-throughput amplicon sequencing showed IDF from pear pomace obviously improved the structure of the gut microbiota. Specifically, it promoted the growth of Bacteroidetes and inhibited the growth of Firmicutes. These results are coincident with previous hypothesis that the ratio of Bacteroidetes/Firmicutes is negatively related with obesity. In conclusion, our results demonstrated IDF from pear pomace could prevent high-fat diet-induced obesity in rats mainly by improving the structure of the gut microbiota.

Keywords: Insoluble dietary fiber; amplicon sequencing; anti-obesity; gut microbiota.

MeSH terms

  • Animals
  • Bacteria / classification
  • Bacteria / drug effects
  • Bacteria / genetics
  • Bacteroidetes / drug effects
  • Bacteroidetes / growth & development
  • Blood Chemical Analysis
  • Body Weight / drug effects
  • DNA, Bacterial / analysis
  • Diet, High-Fat / methods*
  • Dietary Fiber / metabolism
  • Dietary Fiber / pharmacology*
  • Dietary Fiber / therapeutic use*
  • Dietary Supplements
  • Energy Intake / drug effects
  • Enzyme-Linked Immunosorbent Assay / methods
  • Fats / analysis
  • Firmicutes / drug effects
  • Firmicutes / growth & development
  • Gastrointestinal Microbiome / drug effects*
  • Gastrointestinal Microbiome / genetics
  • Gastrointestinal Tract / drug effects
  • Gastrointestinal Tract / microbiology*
  • Gene Expression
  • Glucose / metabolism
  • Glucose Tolerance Test
  • Hematology
  • High-Throughput Screening Assays
  • Hormones / blood
  • Liver / drug effects
  • Liver / metabolism
  • Male
  • Models, Animal
  • Obesity / prevention & control*
  • Pyrus / chemistry*
  • RNA / analysis
  • Rats
  • Rats, Sprague-Dawley
  • Real-Time Polymerase Chain Reaction
  • Time Factors


  • DNA, Bacterial
  • Dietary Fiber
  • Fats
  • Hormones
  • RNA
  • Glucose