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Gut Brain Study

The aim of this project is to understand how different populations of gut bacteria influence brain function and behaviour in humans.

This project includes two studies using state-of-the-art technology to investigate the gut-brain axis in 250 healthy male volunteers. As the largest study of its kind, its outcomes are expected to change how we understand the link between the gut and the brain function in humans and could contribute to the understanding of complex disorders such as autism spectrum disorders and anxiety.

Study 1 will evaluate the relationship between gut bacteria, behaviour and brain function in 250 healthy male volunteers.

Study 2 will investigate the effects of probiotics on brain and behaviour measures.

To participate in these studies, you must meet the following eligibility criteria:

  • Male
  • Right-handed
  • Caucasian
  • Between 18 and 50 years of age
  • Grew up in the UK or other European country
  • Body Mass Index 18.5 to 30

If you would like to take part in the study, please follow this link to see if you are eligible.

For more information, please see

Gut Brain Study (

Current studies