What to Eat for Diverticular Disease and Diverticulitis

Diverticular disease is a common condition that affects the large intestine, particularly as we get older.

Written by Kate Stoker, Principal Dietitian at Simply Nutrition Dietitians

It occurs when small pouches form in the wall of the colon. These are called diverticula. Most people won’t have symptoms, but sometimes these pouches can become inflamed, leading to diverticulitis.

Fibre plays a key role.

A low fibre diet is one of the main risk factors for developing diverticular disease.

Why fibre matters

Fibre helps keep stools soft and easy to pass. When fibre intake is low, stools can become hard and difficult to move through the bowel.

What we often see in clinic is that long-term low fibre intake contributes to constipation and increased pressure in the bowel.

• Hard stools require more straining
• Increased pressure affects the bowel wall
• This can contribute to the formation of diverticula

When is a low fibre diet needed?

During an episode of diverticulitis, the focus is on reducing inflammation and allowing the bowel to rest.

• Temporary low fibre intake may be recommended
• Nuts and seeds are sometimes removed short-term
• Fibre is gradually reintroduced as symptoms settle

This approach is short-term and should be guided appropriately.

Preventing flare-ups

Once inflammation has settled, the goal is to support long-term bowel health and reduce the risk of recurrence.

• Gradually increase fibre intake
• Ensure adequate fluid intake
• Establish regular eating patterns
• Avoid unnecessary food restrictions

Common myths

Many people are told to avoid nuts, seeds, and certain foods long term. Current evidence does not support this for most people.

Long-term restriction is rarely needed.

A balanced, fibre-rich diet is usually the most effective approach.

How a dietitian can help

Managing diverticular disease can be confusing, especially when advice varies.

Working with a dietitian experienced in gut health can help you get clear, practical guidance.

• Set the right fibre intake for your needs
• Guide when and how to increase fibre
• Support fluid intake and bowel habits
• Clarify what foods are actually necessary to avoid

Need help managing diverticular disease?

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