Irritable Bowel Syndrome (IBS) and the Low FODMAP Diet

Updated: Aug 9, 2021


What is IBS?


IBS is a chronic and relapsing Functional Bowel Disorder (FBD). It currently effects 7-15% of the world populations. Symptoms vary considerably, both within and between individuals.

  • Constipation

  • Diarrhoea

  • Bloating

  • Excess wind or gas.

Proposed mechanism of IBS includes:

  • visceral hypersensitivity

  • altered gastrointestinal motility

  • impaired perception and processing of information by the brain

  • low grade inflammation

  • immune system activation

  • intestinal permeability

  • alterations in the gut microbiota


What are NOT symptoms of IBS?

The below are considered 'red flags' that require further investigation, ensure you see your GP.

  • Nocturnal (night) bowel motions

  • Rectal bleeding

  • Unexplained anaemia (low iron)

  • New onset of symptoms or age of onset > 50 years

  • Unintentional weight loss

  • Progressive/severe symptoms

  • Recurrent vomiting

  • Fever


How is IBS diagnosed?

  • IBS is diagnosed using the Rome IV diagnostic criteria by a GP or Gastroenterologist once other