A high intake of dietary fiber influences C-reactive protein and fibrinogen, but not glucose and lipid metabolism, in mildly hypercholesterolemic subjects

Eur J Nutr. 2014 Feb;53(1):39-48. doi: 10.1007/s00394-013-0496-8. Epub 2013 Feb 7.

Abstract

Purpose: The aim of the study was to investigate how a diet high in dietary fiber, with several fiber sources included, modulates glucose and lipid metabolism and the inflammatory response in humans.

Methods: Subjects (n = 25) aged 58.6 (1.1) years (mean and SD) with a BMI of 26.6 (0.5) kg/m(2) and a total cholesterol (TC) of 5.8 (0.1) mmol/L (mean and SEM) were given a high fiber (HF) and low fiber (LF) diet, in a randomized controlled 5-week crossover intervention, separated by a 3-week washout. The HF diet consisted of oat bran, rye bran, and sugar beet fiber incorporated into test food products; one bread roll, one ready meal, and two beverages consumed daily. Equivalent food products, without added fibers, were provided in the LF diet.

Results: Total dietary fiber intake was 48.0 g and 30.2 g per day for the HF and LF diet, respectively. Significant reduction in C-reactive protein (CRP) was observed between the diets (P = 0.017) and a significant reduction in fibrinogen within the HF diet (P = 0.044). There were no significant effects in other measured circulating cytokines or in glucose, insulin, and lipid levels.

Conclusions: Our study suggests that a 5-week high dietary fiber intake of oat bran, rye bran, and sugar beet fiber might reduce the low-grade inflammatory response measured as CRP which could, together with reduced fibrinogen, help to prevent the risk of cardiovascular disease.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Blood Glucose / metabolism
  • Body Mass Index
  • C-Reactive Protein / metabolism*
  • Cardiovascular Diseases / prevention & control
  • Cholesterol, HDL / blood
  • Cholesterol, LDL / blood
  • Cross-Over Studies
  • Dietary Fiber / administration & dosage*
  • Female
  • Fibrinogen / metabolism*
  • Healthy Volunteers
  • Humans
  • Hypercholesterolemia / diet therapy*
  • Lipid Metabolism / physiology
  • Male
  • Middle Aged
  • Single-Blind Method

Substances

  • Blood Glucose
  • Cholesterol, HDL
  • Cholesterol, LDL
  • Dietary Fiber
  • Fibrinogen
  • C-Reactive Protein