Is there a special diet for IBD?

No single diet works for everyone with IBD – foods that worsen symptoms in one person may not affect another, and evidence is limited. A healthy, varied diet is the baseline. Food can affect symptoms individually, so a food diary helps identify triggers, but discuss any big changes with a dietitian. No diet causes or cures IBD.

Should I cut out foods to manage my IBD?

Not without talking to your dietitian or IBD team – cutting out whole foods or food groups risks missing nutrients your body needs, and long-term restrictive diets risk malnutrition. Some people find certain foods affect symptoms and cut down on those, but big changes should be dietitian-supervised. Do not restrict fibre unless there is a stricture and your team advises it.

What nutritional deficiencies are common in IBD?

Low iron and iron-deficiency anaemia are common, as are low vitamin B12 and folate (B12 especially in Crohn’s affecting the small bowel), and low calcium and vitamin D. These are checked with blood tests, and your team may suggest supplements if levels are low. Unintended weight loss and malnutrition should also be reviewed.

Diet and Nutrition with IBD (Crohn's & Colitis, Singapore)

Q: Did my diet cause my IBD?

No. There is no evidence that any particular food causes Crohn’s or colitis – there is nothing you could have eaten differently. The cause is a mix of genes, the immune system, gut bacteria and external factors. Food can affect your symptoms, but it did not cause the condition, and no diet cures it.

Written & reviewed by the BestDoctors.sg editorial team · Last updated 29 Aug 2026 · General information, not medical advice

Quick answer. There is no single diet that works for everyone with IBD, and diet does not cause the condition – so there is nothing you could have eaten differently to prevent it. Food can, however, affect symptoms for some people, and a food diary helps identify individual triggers. A healthy, varied diet is the baseline; cutting out whole food groups risks missing nutrients, so any big change should go through a dietitian. Malnutrition, unintended weight loss and deficiencies such as low iron and vitamin B12 are real risks and should be checked and treated. Staying hydrated matters, especially with diarrhoea.

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No single IBD diet

People often hope for a specific diet that will control their IBD, but the honest position is that there is no particular diet that works for everyone. Foods that worsen symptoms for one person may cause another no problems at all, and there is little high-quality evidence to say exactly which foods help or harm. This means diet in IBD is highly individual. Rather than searching for a single “right” diet, the useful approach is to eat as healthily and varied a diet as you can, notice what affects you personally, and get individual advice from a dietitian, who can tailor guidance to your situation.

Diet does not cause IBD

An important and reassuring message is that diet does not cause IBD. As Crohn’s and Colitis UK puts it, there is no evidence that any particular food causes Crohn’s or colitis, and there is nothing you could have done differently. The cause is a mix of genes, the immune system, gut bacteria and external factors. Equally, no diet cures IBD, and “cure” diets tend to be very restrictive and risk leaving out important nutrients. Understanding this frees you from blame and from chasing unproven diets, and lets you focus on eating well to support your general health while your medical treatment manages the disease.

Food can affect symptoms

While food does not cause IBD or reliably trigger flares – the scientific evidence that food triggers flare-ups is actually weak – some people do find that certain foods affect their symptoms, commonly fatty, spicy or high-fibre foods, and cutting down on these can help them. Others find little effect. Because it is individual, a food diary or app can help you spot which foods, if any, affect your symptoms, and it is easier to identify triggers when your disease is under control than during a flare. Crucially, discuss any patterns, and any big changes, with your IBD team or dietitian before acting on them.

Eating in a flare and in remission

What you eat may differ between a flare and remission. During a flare, some people find it hard to manage much fibre, and as you start to feel better it is important to return to a healthy, balanced diet. General guidance is a healthy, varied diet with plenty of fruit, vegetables, nuts, seeds, protein and wholegrains, limiting high-fat, high-sugar and high-salt foods, animal fats and processed meats. One specific point: do not restrict fibre unless there is a narrowing of the bowel (a stricture), in which case your IBD team may advise differently. As always, individual advice from a dietitian is best.

Malnutrition and weight loss

Malnutrition and unintended weight loss are real risks in IBD. Many people with Crohn’s or colitis have some degree of undernutrition, because the inflamed gut may not absorb nutrients well and appetite can be reduced, so weight can fall without trying. Undernutrition matters because it makes IBD harder to control, and it should be treated, usually with a referral to a dietitian. It is worth noting that weight gain can also happen – from diet changes, illness or steroids – and that someone who is overweight can still be short of specific nutrients. Any significant unintended weight loss should be reviewed by your team.

Deficiencies to watch for

Because IBD can affect how nutrients are absorbed, and because of blood loss and reduced intake, deficiencies are common and are checked with blood tests. Low iron and iron-deficiency anaemia are frequent; iron-rich foods and vitamin C aid absorption, while tea and coffee hinder it. Vitamin B12 and folate, both needed to make red blood cells, can be low – B12 especially in Crohn’s affecting the small bowel or after small-bowel surgery. Calcium and vitamin D are often low, and steroids can worsen bone health. If low levels are found, your team may suggest supplements; this guide does not give doses, as these are decided by your clinicians.

Avoid unnecessary restriction

A key safety message is not to cut foods out of your diet without talking to your dietitian or IBD team, because doing so could mean missing nutrients your body needs, and following restrictive diets long-term risks malnutrition. Experts do not recommend cutting out whole foods or food groups. Dietitians are regulated professionals who assess and treat diet problems, help you build a healthy diet that works for you, and supervise any exclusion or nutritional-treatment approach where it is genuinely needed. So rather than trying restrictive diets you have read about, the safe and effective route is to work with a dietitian, who can tailor advice to your particular IBD.

Hydration and specialist nutrition

Staying hydrated matters in IBD, and aiming for around six to eight cups of fluid a day is a reasonable general target. With diarrhoea it is especially important to drink plenty to avoid dehydration, because an inflamed large bowel absorbs less liquid, and caffeine and alcohol can worsen diarrhoea. In some situations, a specialist may prescribe enteral nutrition – liquid feeds – as a treatment, particularly a liquid-only diet used to treat Crohn’s disease, and especially in children; it is not used for ulcerative colitis, and it is always dietitian-supported, not a do-it-yourself remedy. Your team can explain if this is relevant for you.

Getting support and staying safe

In Singapore, dietitians and gastroenterology and IBD teams at the public hospitals can give individualised diet and nutrition advice, and paediatric services support children with IBD. The Crohn’s and Colitis Society of Singapore offers patient support. Ask your IBD team for a referral to a dietitian if diet, weight or nutrition is a concern. And keep the safety points in mind: significant unintended weight loss, being unable to keep food or fluids down, or signs of dehydration need medical review, and a severe flare is a medical emergency – call 995 or go to A&E.

Sources

Crohn’s and Colitis UK – Food and Crohn’s or Colitis: crohnsandcolitis.org.uk
NHS – Inflammatory bowel disease: nhs.uk
NHS – Iron deficiency anaemia: nhs.uk
NHS – Crohn’s disease: nhs.uk

General information only. This guide supports, but does not replace, advice from your own gastroenterologist and IBD team. Get urgent medical help – call 995 or go to A&E – if you have severe or worsening tummy pain, a high fever, heavy or persistent rectal bleeding, are vomiting repeatedly or cannot keep fluids down, have a swollen, very tender abdomen, or show signs of dehydration; a severe flare can be a medical emergency. Never stop your IBD medication without medical advice – steroids must be reduced gradually, and stopping maintenance treatment can trigger a flare. If you are on immune-suppressing or biologic treatment, seek advice promptly for a fever or signs of infection. If you are struggling emotionally, you are not alone: the Samaritans of Singapore (SOS) are on 1767 and mindline.sg on 1771.

Diet & Nutrition with IBD