Diet to help prevent diverticulitis

A gradual increase in dietary fibre, adequate fluids and regular bowel habits can support prevention of diverticulitis flare-ups. Add vegetables, fruit, beans, lentils and whole grains in a way your digestive system tolerates, rather than making a sudden large change.

Diverticular disease involves small pouches in the bowel wall. Constipation and straining can make bowel movements harder, while fibre and fluids can help stool pass more easily for many people. Dietary tolerance differs: some people notice bloating when fibre rises quickly. Nuts, seeds and popcorn do not need routine avoidance unless a clinician has given you a specific reason.

Start with one extra fibre-rich food at a time, such as oats, a piece of fruit, vegetables or lentils, and increase gradually. Drink fluids regularly unless you have been told to restrict them. Keep moving, respond to the urge to open your bowels, and avoid repeated straining. During a suspected flare-up, do not force a high-fibre diet; contact a GP for advice about symptoms and suitable foods. Nutrition counselling can help if meals are limited by bloating or another condition.

Seek medical advice for new or persistent abdominal pain, fever, vomiting, a swollen abdomen, blood in the stool, or constipation that does not improve. Severe or worsening pain, faintness, repeated vomiting or inability to pass stool or gas needs urgent assessment. A flare-up can resemble other abdominal problems, so diet should not delay a diagnosis.

Ask how quickly to increase fibre, which fluid intake is suitable, whether your medicines affect constipation, and what to eat if pain or bloating develops. Ask whether a GP consultation or nutrition counselling would help you personalise prevention.