Foods do not affect everyone with IBS the same way. Start a food-and-symptom diary for 1-2 weeks and change one thing at a time. Goldman-Cecil Medicine, 2-volume set, p. 2404.
A low-FODMAP diet can reduce pain, bloating, and bowel symptoms, but it is meant to be a
short elimination trial followed by gradual food reintroduction, preferably with a dietitian.
Yamada's Textbook of Gastroenterology, 7th ed., p. 1471. NICE likewise recommends professional dietary guidance for restrictive diets such as low FODMAP diets, as described in its
IBS guidance.
If you have weight loss, blood in stool, fever, anemia, vomiting, or symptoms that wake you from sleep, contact a clinician rather than treating this as IBS alone.