Do dairy products make your IBS symptoms worse?

At The Functional Gut Clinic we use state of the art technology to perform detailed hydrogen and methane breath testing to objectively evaluate patients as to the likely cause of their symptoms. As part of an IBS awareness initiative we are looking for IBS sufferers to take part in an event day at The Functional Gut Clinic to evaluate the effects of different types of milk on symptoms and to test for true lactose intolerance by performing a free hydrogen and methane breath test after drinking 500ml of milk.

A formal clinical report from the clinic will be available to people who participate in the awareness day which could help with your future management of IBS symptoms. 


The awareness day took part on the 8th November 2016. For the full results & clinical conclusion please follow this link to watch our short Video: IBS Awareness Day: a2 Milk and Lactose Intolerance.

Participants Entry Criteria

  • Must be previously diagnosed with IBS.
  • Must be able to consume cows’ milk without the risk of severe illness – e.g. no allergies or severe lactose intolerance.
  • Must not have any other major digestive disorders which could skew results e.g. inflammatory bowel disease.
  • Must be available to visit our London clinic on Tuesday 8th November.
  • Must be willing to be interviewed on camera / filmed being tested with footage to be used on a2 Milk/Functional Gut Clinic’s own marketing materials, and potentially given to media.

More about IBS

Irritable Bowel Syndrome (IBS) is a common condition, which causes symptoms such as bloating, stomach cramps, constipation, diarrhoea and excessive gas. Many people with IBS find that certain food types can worsen their symptoms and try to avoid these foods. One of the most commonly avoided food groups are dairy products. This is because dairy products contain a complex sugar called lactose, which can be difficult to digest meaning that bacteria in the colon break it down instead and this can cause IBS symptoms. This is called Lactose mal-absorption / intolerance.

However, recent scientific research has shown that in a proportion of people, these symptoms are due to the type of protein in the milk as opposed to the lactose. This means that simply by switching to a different type of milk then all of the nutritional benefits of drinking milk can be achieved without many of the troublesome IBS symptoms.


Dr. Anthony Hobson - Consultant Clinical Scientist & Clinical Director 

For further information please e-mail Anthony directly at: anthony@thefunctionalgutclinic.com or call us on +44(0) 207 486 7777 (Mon-Friday between 09:30-17:30). 

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