This Dutch study was looking at the the association between different diets and the composition of the gut microbe by examining the faeces of 1425 patients. The metabolic pathways of these microbes were analysed to determine whether the metabolites had pro or anti-inflammatory effects.

4 groups of patients were included. Those with known inflammatory bowels disease (Crohn’s disease and Ulcerative Colitis), irritable bowel syndrome and a control group of healthy individuals.

This study tried to account for long term dietary habits by using a questionnaire, and from this they estimated the amounts of macronutrients and micronutrients consumed. Clusters of foods that were typically eaten together were identified in order to get a complete picture of the diets consumed which has not previously been done.

Associations between these dietary patterns and microbial clusters were then made.


I have to admit, I am very new to learning about the microbiome.

So let me summarise what I learnt from this article.


  • The food we eat, is broken down by bacteria in our gut so that it can be absorbed.
  • The types of food we eat influence the types of bacteria present as they compete for the nutrients we ingest. The overall composition of bacteria in our guts is known as the microbiome.
  • Different species of bacteria produce different metabolites (by- products) which have their own properties.
  • Some of these metabolites are thought to trigger inflammation locally (affecting the gut mucosa) and some may be implicated in ‘immune mediated inflammatory diseases’ (IMIDs) which affect the body as a whole – conditions such as diabetes, arthritis and autoimmune disease.
  • Other metabolites are thought to have an anti-inflammatory effect such as short chain fatty acids (SCFA).
  • The fermentation of fibre forms SCFAs.

Now I have to admit the nitty gritty of this study is fairly complicated with associations between food clusters, types of bacteria and their metabolites having to be made and then matched with the effects of these metabolites supported by previous research.


Although this study has its limitations, only allowing us to make associations between our diet and the microbiome, this study is suggesting that regardless of whether or not there is underlying inflammatory or irritable bowel disease, there is a link between our diet and our microbiome which then determines the inflammatory properties of the foods we eat.

When there is an imbalance of bacteria in our guts, this can trigger inflammation. And the timing and quantity of food we eat also plays a role.

This study has allowed us to see which foods, when eaten consistently are pro or anti inflammatory.

However it is unclear how long these diets need to be sustained for a change in the microbiome to be seen.

If you would like to read the complete study HERE

If you have read this research, what did you think? Let me know in the comments below.


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