IBD flare-up diet

Reviewed by Dr. Nikita Dinger, Founder & CEO, BioMeBar. Last reviewed 7 October 2026.

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What it is

When ulcerative colitis or Crohn’s disease becomes active, the gut is inflamed and often in a hurry. Meals that were fine last month can suddenly bring on pain or urgency. A flare-up diet is a short-term, practical way of eating that aims to keep you nourished while the bowel is irritated, until your medical team has the disease under control again.

It is not a fix-all and there is no single approved diet for IBD. It sits alongside medicines, which do the main work. If you have not been diagnosed, see our overview of IBD first.

Food rarely sparks a flare on its own, and blaming a single meal can lead to needless fear around eating. Infections, missed medicines, NSAID painkillers, antibiotics and stress are more common triggers, and sometimes there is no clear one at all.

Common symptoms

• Frequent loose stools, sometimes with blood or mucus
• Urgency, including at night
• Cramping, especially after eating
• Poor appetite, and fear of eating
• Fatigue and weight loss
• Dehydration and low iron or potassium in heavier flares

How gut bacteria may be involved

During active inflammation, the gut community generally becomes less diverse, with fewer of the bacteria that make short-chain fatty acids. Diarrhoea, medicines such as steroids and antibiotics, and reduced food intake all shift the community further. This is one reason it is hard to know which change came first.

Fibre is the nutrient bacteria use to make butyrate, but coarse insoluble fibre can irritate an inflamed or narrowed bowel. Many dietitians therefore suggest temporarily moving to softer, lower-residue foods in a flare, and widening the diet again once you are well. Evidence for specific diets in flares is still developing, and what works varies from one person to the next, so plans should come from your own team.

Diet and everyday habits

The priorities during a flare are fluid, calories and protein. Losing weight or muscle makes recovery harder.

• Smaller meals, five to six a day, instead of three large ones
• Soft Indian staples: moong dal khichdi with a little ghee, curd rice, idli with thin sambar, rice with dal water, upma, well-cooked suji porridge
• Peeled, cooked and soft vegetables such as lauki, pumpkin, carrot, ripe tomato without skin, and mashed potato
• Protein you can tolerate: eggs, paneer, thick curd, tofu, well-cooked chicken or fish, and smooth dal
• Temporarily limit raw salads, sprouts, whole nuts, seeds, skins, large portions of rajma or chana, very spicy gravies and deep-fried snacks
• Check lactose: some people feel worse with milk during a flare. Chaas or lactose-free milk are options
• Oral nutritional supplements can help if you cannot eat enough. Ask your clinic or dietitian
• Sip fluids and ORS through the day, especially with frequent diarrhoea

See also our IBD flare diet page for a sample day, and aim to reintroduce ragi, jowar and bajra gradually once things quieten.

Cook with less oil than usual, as fatty meals can worsen urgency, and prefer steaming, boiling or pressure cooking to frying. A little ghee for flavour is often fine.

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When to see a doctor first

A flare is a reason to contact your gastroenterologist early, not to wait it out with food changes. Do not delay care if you have:

• Heavy bleeding, or more than six bloody stools a day
• Fever, a fast heart rate or severe abdominal pain
• A swollen, tender abdomen or repeated vomiting
• Signs of dehydration, such as dizziness or very little urine
• Weight loss despite eating, or symptoms that are not settling after several days

Never stop prescribed medicines because you are feeling better, or worse, without speaking to your team.

How BioMeBar approaches it

In an active flare we step back and ask you to prioritise your medical team. We do not suggest starting something new during a flare unless your doctor is comfortable with it. Once your doctor has things under control, your gut profile and symptoms can guide a personalised synbiotic match and food guidance, with check-ins to track how you feel.

We do not diagnose, treat or cure IBD or its flares.

Common questions

Should I stop eating fibre during a flare?

You may need to avoid coarse and raw fibre for a while, but fully removing it is not usually advised for long. Soft, cooked and soluble sources like oats, banana and well-cooked vegetables are often easier.

Is curd safe during a flare?

Many people tolerate it well, and it provides protein and calcium. If you notice worse symptoms, try a smaller portion, or chaas, and note it in your diary.

How soon can I return to normal food?

As symptoms settle, foods are usually reintroduced one at a time over days to weeks. Your dietitian can set the pace so that you do not swing back too quickly.

Can I use a liquid or formula diet?

Nutritional formulas are used under specialist supervision, notably in Crohn’s disease, and they can supply calories and protein when eating is difficult. Ask your IBD team before starting one.

Sources

• ESPEN guideline on clinical nutrition in inflammatory bowel disease
• ACG Clinical Guideline: Ulcerative Colitis in Adults (2019)
• ACG Clinical Guideline: Management of Crohn’s Disease in Adults (2018)
• ICMR-NIN Dietary Guidelines for Indians

Talk to us

If you would like to know whether BioMeBar can support you, message us on WhatsApp. Tell us your symptoms and your pincode and we will take it from there. Not sure where to start? Take the free gut assessment, which takes about three minutes.

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BioMeBar provides nutrition and gut health guidance and does not replace medical care. See a doctor for severe, persistent or worrying symptoms.