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Related Experiment Videos

Chitosan for overweight or obesity.

C Ni Mhurchu1, C A E Dunshea-Mooij, D Bennett

  • 1Clinical Trials Research Unit (CTRU), Department of Medicine, University of Auckland, Private Bag 92019, Auckland, New Zealand. c.nimhurchu@ctru.auckland.ac.nz

The Cochrane Database of Systematic Reviews
|July 22, 2005
PubMed
Summary

Chitosan may offer short-term weight loss benefits for overweight individuals, but evidence from high-quality studies suggests its effect on body weight is minimal and not clinically significant.

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Area of Science:

  • Nutritional Science
  • Dietary Supplements
  • Obesity Research

Background:

  • Chitosan, derived from chitin, is a widely available over-the-counter dietary supplement.
  • Its efficacy in promoting weight loss has been a subject of ongoing debate and research.

Purpose of the Study:

  • To systematically assess the effectiveness of chitosan as a treatment for overweight and obesity through a review of randomized controlled trials.

Main Methods:

  • A comprehensive literature search was conducted across multiple electronic databases and specialized websites.
  • Inclusion criteria specified randomized controlled trials of at least four weeks duration in adults who were overweight or obese.
  • Data extraction and analysis involved independent review, consensus resolution, and calculation of pooled effect sizes.

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Main Results:

  • Fourteen trials with 1131 participants were included. Pooled analyses indicated chitosan significantly reduced weight, total cholesterol, and blood pressure compared to placebo.
  • However, analyses restricted to high-quality studies (e.g., those with allocation concealment, larger size, or longer duration) showed substantially smaller decreases in weight and total cholesterol.

Conclusions:

  • While some evidence suggests chitosan may be more effective than placebo for short-term weight management, many trials are of suboptimal quality.
  • Results from high-quality studies indicate that chitosan's effect on body weight is minimal and likely not clinically significant.