Which of the following statements are true about irritable bowel syndrome (IBS)?
1) it is about twice as common in males as in females;
2) there are three clinical types: diarrhoea-predominant IBS, constipation-predominant IBS and mixed-type IBS;
3) patients should follow a diet rich in insoluble fibre;
4) the diagnostic criterion includes: recurring abdominal pain of at least 3 months’ duration, occurring ≥1 day a week and meeting ≥2 of the following criteria: it is connected with passing stools, it is connected with a change in bowel movement frequency, it is connected with a change in the stool form;
5) colonoscopy should be performed in every patient with IBS;
6) in the treatment of IBS, FODMAP diet should be followed for 4-6 weeks
The correct answer is: