title: Inulin-type fructans with different degrees of polymerization improve lipid metabolism but not glucose metabolism in rats fed a high-fat diet under energy restriction.
abstract: BACKGROUND
  Inulin-type fructan ameliorates metabolic diseases associated with obesity in animals. However, relatively little information is available on the comparative effects of inulins with different degree of polymerization (DP) on the lipid or glucose metabolism.
  
  
  OBJECTIVE
  The objective of this study was to investigate the effect of inulins with various DP on metabolic disorders associated with obesity in rats fed a high-fat diet under food restriction.
  
  
  METHODS
  Rats were fed a high-fat diet supplemented with 5 % inulin-GR (Raftiline GR), inulin-Tokachi (Tokachi), or inulin-HP (Raftiline HP) without cellulose for 28 days at normal energy intakes or 14.5 % energy restriction.
  
  
  RESULTS
  Under food restriction, the dietary inulin-Tokachi (mean DP 15) and -HP (mean DP 24), but not -GR (mean DP 10), reduced (p < 0.05) the serum cholesterol and triglyceride levels, and liver triglyceride concentration in rats, compared to the control diet. The cecal neutral steroid, bile acid, and propionate concentrations in the Tokachi and HP groups were higher (p < 0.05) than in the CONT group, and the cecal Bifidobacterium count in the Tokachi group was higher (p < 0.05) than in the other groups.
  
  
  CONCLUSIONS
  Findings suggest that, depending on DP, dietary supplementation with inulin (DP 15 or DP 24) in rats fed a high-fat diet, regardless of food intake, positively modulates lipid metabolism and fecal microbiota but not glucose metabolism.
authors.affiliation: Department of Food Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, 080-8555, Japan. kyuho@obihiro.ac.jp
authors.forename: Kyu-Ho
authors.initials: KH
authors.lastname: Han
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Tsuchihira
authors.forename: Yumi
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Shimada
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Ohba
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Aritsuka
authors.forename: Hirokatsu
authors.initials: H
authors.lastname: Uchino
authors.forename: Hirohito
authors.initials: H
authors.lastname: Kikuchi
authors.forename: Michihiro
authors.initials: M
authors.lastname: Fukushima
mesh_terms: D000818:Animals; D050197:Atherosclerosis / Q000473:pathology / Q000517:prevention & control; D001786:Blood Glucose / Q000187:drug effects; D004041:Dietary Fats / Q000008:administration & dosage* / Q000009:adverse effects; D004334:Drug Administration Schedule; D002149:Energy Intake; D005630:Fructans / Q000737:chemistry* / Q000494:pharmacology*; D005947:Glucose / Q000378:metabolism*; D050356:Lipid Metabolism / Q000187:drug effects* / Q000502:physiology; D008055:Lipids / Q000097:blood; D011108:Polymers; D051381:Rats
chemical_list: D001786:Blood Glucose; D004041:Dietary Fats; D005630:Fructans; D008055:Lipids; D011108:Polymers; D005947:Glucose