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Centre of Research & Education in Nutrition & Digestibility of Bread & the Gut Microbiome

Over forty years ago, a little girl fell head over heels in love with the bread she was served in the local village restaurant in the Dordogne. This simple passion led her to train as a baker, but when she stopped being able to eat industrial bread, she embarked on a lifetime of research to discover why she could digest sourdough. This has has grown into The Sourdough School as we know it today; leading the way in the application of the most up to date research, to make bread that nourishes.
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492 - ‘Effect of breadmaking process on in vitro gut microbiota parameters in irritable bowel syndrome’. PLoS One. 9(10):e111225.

Reference Number: 492

Year: 2014

Authors: Adele Costabile, Sara Santarelli, Sandrine P Claus, Jeremy Sanderson, Barry N Hudspith, Jonathan Brostoff, Jane L Ward, Alison Lovegrove, Peter R Shewry, Hannah E Jones, Andrew M Whitley, Glenn R Gibson

Link: Link to original paper

Health: IBS

Nutrition: Wheat dextrin | Whole grain

Intolerance & Sensitivity: Non coeliac gluten sensitivity | Wheat sensitivity

Inclusions: Wheat (whole)

Summary

A variety of foods have been implicated in symptoms of patients with Irritable Bowel Syndrome (IBS) but wheat products are most frequently cited by patients as a trigger. Our aim was to investigate the effects of breads, which were fermented for different lengths of time, on the colonic microbiota using in vitro batch culture experiments. A set of in vitro anaerobic culture systems were run over a period of 24 h using faeces from 3 different IBS donors (Rome Criteria-mainly constipated) and 3 healthy donors. Changes in gut microbiota during a time course were identified by fluorescence in situ hybridisation (FISH), whilst the small-molecular weight metabolomic profile was determined by NMR analysis. Gas production was separately investigated in non pH-controlled, 36 h batch culture experiments. Numbers of bifidobacteria were higher in healthy subjects compared to IBS donors. In addition, the healthy donors showed a significant increase in bifidobacteria (P<0.005) after 8 h of fermentation of a bread produced using a sourdough process (type C) compared to breads produced with commercial yeasted dough (type B) and no time fermentation (Chorleywood Breadmaking process) (type A). A significant decrease of ?-Proteobacteria and most Gemmatimonadetes species was observed after 24 h fermentation of type C bread in both IBS and healthy donors. In general, IBS donors showed higher rates of gas production compared to healthy donors. Rates of gas production for type A and conventional long fermentation (type B) breads were almost identical in IBS and healthy donors. Sourdough bread produced significantly lower cumulative gas after 15 h fermentation as compared to type A and B breads in IBS donors but not in the healthy controls. In conclusion, breads fermented by the traditional long fermentation and sourdough are less likely to lead to IBS symptoms compared to bread made using the Chorleywood Breadmaking Process.

 

Significance of this study to the baker:

The Chorleywood Breadmaking process came about in 1961 when bread production was ramped up in both scale and speed. This did not allow time for the fermentation step which means the structure of the bread changes. We find this structure is unfavourable for the health of our gut, and more likely leading to increased intestinal permeability (aka ‘leaky’ gut) and promotion of Irritable Bowel Syndrome (IBS) symptoms. This highlights why bread made from good quality flour and baked with a lengthy fermentation time, as in the case of sourdough, supports the physical health of our gut, reducing the symptoms of IBS.

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