IBD Diet During A Flare: Food, Fluids & Tips

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During an IBD flare, eating may become difficult because of symptoms such as diarrhoea, abdominal pain, bloating, and discomfort, which can affect what you can tolerate. The aim of diet during a flare should be to keep you hydrated and provide enough nutrients. Choose foods that are easy to digest. There is no single diet plan that can work for everyone, so food choices may be adjusted according to individual symptoms and tolerance.

First Assess Severity

Before changing your diet during an IBD flare. It is important to understand how severe the symptoms are. Mild symptoms may only require small changes to meal size or portion, fibre, and hydration, while more severe symptoms can increase the risk of dehydration and nutritional deficiencies. Individual symptoms, stool frequency, bleeding, pain, fever, ability to eat or drink, and overall health can help assess the flare and can help in the treatment.   

Hydration And Oral Fluids

Staying hydrated is important, especially during a flare. Particularly when you have frequent diarrhoea and vomiting, it’s important to balance body fluids. Take small amounts of fluids throughout the day rather than taking them all at once. Drink at least 8 to 10 glasses of water per day. Water, oral rehydration solutions, and clear soups help maintain lost fluids and electrolytes. Limit sugary drinks and excess caffeine because they can worsen your symptoms. Plain water may not help during loose stools; use diluted electrolyte drinks. Signs of dehydration such as dizziness, dark urine, dry mouth, or fainting should be discussed with a doctor.

Small Frequent Meals

During an IBD flare, it is harder for the body to digest food due to slow agni (digestive fire) and ongoing inflammation. Health care professionals recommend eating 5-6 frequent meals instead of eating 2 or 3 larger meals. It helps reduce stress on your digestive tract and makes it easier for your body to digest food and absorb nutrients during an IBD flare. The diet should be completely based on your appetite and symptoms. Eat slowly and eat what you think you can tolerate well. This can help you maintain enough protein and calories when eating a full meal feels difficult. 

Gentler Protein And Carbohydrate Choices

During a flare, foods that are soft and well-cooked are easier to digest. The right choices may vary from person to person. 

Gentler Protein Options

• Tofu, paneer, curd, or lactose-free dairy can be introduced if tolerated.
• Dal and lentils may be easier when cooked well and mashed or blended.
• Choose smaller portions when full servings feel difficult to eat. 

Gentler Carbohydrate Options

• Rice, khichdi, oats, peeled potatoes, and plain white bread may be easier to digest.
• If fibre worsens the diarrhoea and abdominal pain, try reducing whole grains, raw vegetables, and fruit skins. 
• Avoid cutting carbs completely as they can help maintain energy, especially during a flare. 

When Lower-Fibre Choices May Help

Lower- fibre choices may be useful for a short time when a flare causes frequent diarrhoea, urgency, abdominal discomfort or vomiting. They can reduce the amount of undigestible food moving through the gut. A lower-fibre diet may be recommended when:

• If you have stricture or narrowing, your doctor may recommend a specific low-fibre or low-residue diet. 
• If you have active inflammation.
• If you have severe diarrhoea or fast bowel movements.
• Choose foods such as white rice, refined bread, peeled potatoes and well-cooked vegetables. 

Foods That May Worsen Personal Symptoms

During a flare, some foods may make symptoms such as diarrhoea, bloating, cramps or urgency feel worse. You should limit:

• Spicy foods and oily food options
• Caffeine because it can increase bowel urgency
• Sugary drinks because they may make loose stools worse
• High-fat foods because they are heavier to digest
• Milk and other dairy products; choose lactose-free products instead if it worsens your symptoms.
• Keep track of your symptoms using a diary so that you can track your eating patterns and avoid suddenly reducing a large amount of your diet. 
• There is no need to suddenly avoid these food options; you should consult a doctor before.

How To Return To A Broader Diet

As your symptoms settle, you can gradually bring back foods you had reduced during the flare; there is no need to stay on a restricted diet longer than necessary. Start with small portions and add foods one at a time so you can see how your body responds. 

• Increase variety rather than changing everything at once.
• Add back fibre-rich foods, starting with cooked vegetables and field fruits, if tolerated.
• Reintroduce whole grains from vegetables, nuts, or seeds according to your tolerance. 
• Continue including protein, carbohydrates, and healthy fats to support energy and nutrition.
• If a food causes symptoms, you should stop it and try again later. 
• If you have a stricture or ongoing symptoms, or significant weight loss, discuss dietary changes with your doctor. 

When A Dietitian Or Urgent Care Is Needed

Food changes can help with comfort, but they cannot treat a severe IBD flare. If your symptoms are getting worse, you're struggling to eat and drink anything, or your test results aren’t showing any improvement, you should consult wth your doctor. You may need serious medical care in case of vomiting and high-output diarrhoea.

Vomiting

Vomiting during an IBD flare can make it difficult to keep enough fluids and nutrients in the body. Take small, frequent sips of water or an oral rehydration solution. Vomiting can happen due to inflammation and narrowing in the intestine, gut irritation, and side effects of certain medicines. If vomiting continues and it causes dizziness and severe weakness, seek immediate medical help.

High-Output Diarrhoea

Frequent, watery stools can lead to a quick loss of water and electrolytes during a flare. Keep taking fluids regularly and consider an oral rehydration solution (ORS). If diarrhoea is very frequent and comes with bleeding, fever, pain, signs of dehydration, or severe weakness, then seek immediate medical help. 

Stoma Considerations

If you have an ileostomy or another stoma, diarrhoea can increase your stoma output and raise the risk of dehydration. Keep track of changes in output and make sure you're drinking enough fluids. If your output becomes unusually high, your doctor can advise you on suitable fluids, electrolytes and foods. A sudden increase in output, dizziness, and weakness should prompt serious medical care. 

Do Not Fast Or Follow Detox Diets

Fasting or using detox diets during an IBD flare is not a good way to rest the gut. Your body still needs energy, protein, and fluids, especially when you are losing nutrients due to frequent diarrhoea; instead, eat small and frequent meals and adjust the fibre and carbs according to your symptoms.

Reference 

Food and Food Groups in Inflammatory Bowel Disease (IBD): The Design of the Groningen Anti-Inflammatory Diet (GrAID) - PMC

The Role of Dietary Fibers in the Management of IBD Symptoms - PMC

Practical insights into stomas in inflammatory bowel disease: what every healthcare provider needs to know - PubMed

Pathophysiology of IBD associated diarrhea - PMC