The Sourdough School

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Learn to bake, eat, and share the healthiest bread in the world. Discover how to bake as Lifestyle Medicine from the walled gardens of Dr Vanessa Kimbell’s beautiful Victorian home in rural Northamptonshire in the UK, where we train healthcare professionals, teach bakers, and support individuals to bake personalised bread using nutrigenetics and gut health assessments.

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605 - ‘Dietary fibre, whole grains, and risk of colorectal cancer: systematic review and dose-response meta-analysis of prospective studies’. BMJ. 343:d6617

Reference Number: 605

Year: 2011

Authors: Dagfinn Aune, Doris S M Chan, Rosa Lau, Rui Vieira, Darren C Greenwood, Ellen Kampman and Teresa Norat

Link: Link to original paper

Health: Cancer | Colorectal Cancer

Nutrition: Fibre | Whole grain

Summary

Abstract

Objective: To investigate the association between intake of dietary fibre and whole grains and risk of colorectal cancer.

Design: Systematic review and meta-analysis of prospective observational studies.

Data sources: PubMed and several other databases up to December 2010 and the reference lists of studies included in the analysis as well as those listed in published meta-analyses.

Study selection: Prospective cohort and nested case-control studies of dietary fibre or whole grain intake and incidence of colorectal cancer.

Results: 25 prospective studies were included in the analysis. The summary relative risk of developing colorectal cancer for 10 g daily of total dietary fibre (16 studies) was 0.90 (95% confidence interval 0.86 to 0.94, I2=0%), for fruit fibre (n=9) was 0.93 (0.82 to 1.05, I2=23%), for vegetable fibre (n=9) was 0.98 (0.91 to 1.06, I2=0%), for legume fibre (n=4) was 0.62 (0.27 to 1.42, I2=58%), and for cereal fibre (n=8) was 0.90 (0.83 to 0.97, I2=0%). The summary relative risk for an increment of three servings daily of whole grains (n=6) was 0.83 (0.78 to 0.89, I2=18%).

Conclusion: A high intake of dietary fibre, in particular cereal fibre and whole grains, was associated with a reduced risk of colorectal cancer. Further studies should report more detailed results, including those for subtypes of fibre and be stratified by other risk factors to rule out residual confounding. Further assessment of the impact of measurement errors on the risk estimates is also warranted.

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All reasonable care is taken when advising about health aspects of bread, but the information that we share is not intended to take the place of treatment by a qualified medical practitioner. You must seek professional advice if you are in any doubt about any medical condition. Any application of the ideas and information contained on this website is at the reader's sole discretion and risk.

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