However it is said to be the linked to serious illnesses such as arthritis, Coeliac disease, Crohn’s disease and inflammatory bowel disease.
According to the NHS, it is also suggested to be the cause of long-term conditions including chronic fatigue syndrome and multiple sclerosis.
“The syndrome describes conditions that are related to increased permeability of the intestines – as in a leaky gut,” said Dr Davinder Garcha, a medical advisor at Bio–Kult (www.bio-kult.com).