According to Gram Research analysis of a 2026 Brazilian expert consensus, diet significantly affects inflammatory bowel disease progression, with different nutritional strategies recommended during active flare-ups versus remission periods. The consensus, developed by 80 or more gastroenterologists and nutritionists, emphasizes personalized nutrition screening, targeted dietary management, and supplementation to reduce symptoms and support healing based on disease stage.
A team of Brazilian digestive health experts reviewed the latest research on how diet affects inflammatory bowel diseases like Crohn’s disease and ulcerative colitis. They created a practical guide showing which foods and nutrients help during flare-ups versus calm periods, plus recommendations for supplements and special diets. This consensus, developed by nutritionists, gastroenterologists, and surgeons, gives doctors and patients clear evidence-based strategies for managing these conditions through food choices.
Key Statistics
A 2026 systematic review consensus by the Brazilian Organization for Crohn’s and Colitis reviewed evidence from multiple studies to create nutrition guidelines for inflammatory bowel disease, with recommendations requiring at least 80 percent expert agreement to be included.
The consensus addresses nutritional management across disease phases, including active flare-ups and remission periods, recognizing that Crohn’s disease and ulcerative colitis require different dietary approaches due to different patterns of intestinal involvement.
Expert recommendations include nutritional screening, targeted dietary therapy, supplementation for common deficiencies like iron and vitamin D, and personalized exclusion diets based on individual food tolerances in inflammatory bowel disease patients.
The Quick Take
- What they studied: How diet and nutrition affect the course of inflammatory bowel diseases, including which foods help during active disease versus remission periods
- Who participated: Expert panel of 80 or more nutritionists, gastroenterologists, and colorectal surgeons from Brazil who reviewed published research and reached consensus on recommendations
- Key finding: Diet plays a significant role in managing inflammatory bowel disease, with different nutritional strategies recommended depending on whether the disease is active or in remission
- What it means for you: If you have Crohn’s disease or ulcerative colitis, working with your doctor to adjust your diet based on your disease stage may help reduce symptoms and flare-ups, though individual responses vary
The Research Details
This was a systematic review, meaning experts searched through all the recent scientific literature on nutrition and inflammatory bowel disease. The Brazilian Organization for Crohn’s and Colitis (GEDIIB) brought together nutritionists, gastroenterologists, and colorectal surgeons to review this evidence together. They used a modified Delphi panel process, which is a structured way to reach agreement among experts. Each recommendation had to be approved by at least 80 percent of the panel members to be included in the final consensus. This approach ensures that the recommendations reflect the best current evidence and expert opinion combined.
Inflammatory bowel diseases are complex conditions influenced by genetics, lifestyle, and diet. Because these diseases affect how the digestive system works, nutrition management is a key part of treatment. Having clear, evidence-based guidelines helps doctors and patients make better decisions about food choices. This consensus brings together the latest research in one place, making it easier for healthcare providers to give consistent advice.
This consensus was developed by a large panel of specialists with deep expertise in digestive diseases and nutrition. The systematic review process means they looked at published research rather than relying on individual opinions. The requirement for 80 percent agreement among experts ensures the recommendations are well-supported. However, because individual responses to diet vary, recommendations should be personalized with a healthcare provider.
What the Results Show
The consensus provides specific nutritional recommendations tailored to disease activity. During active disease flare-ups, the recommendations focus on reducing inflammation and supporting nutrient absorption, which may be compromised by intestinal damage. During remission periods when symptoms are calm, the focus shifts to maintaining good nutrition and preventing future flare-ups. The guidelines address nutritional screening to identify deficiencies, appropriate nutritional therapy for each disease phase, dietary management strategies, exclusion diets that may help certain patients, and supplementation needs. The recommendations recognize that Crohn’s disease and ulcerative colitis have different patterns and may require different dietary approaches. For example, Crohn’s disease can affect any part of the digestive tract, while ulcerative colitis primarily affects the colon, leading to different nutritional concerns.
The consensus also addresses practical aspects of nutrition management including how to screen patients for nutritional problems, how to diagnose specific nutrient deficiencies common in IBD, and how to monitor nutritional status over time. It provides guidance on which foods to include and exclude based on individual tolerance. The panel also reviewed evidence on supplementation, including vitamins, minerals, and other nutrients that patients with IBD often need. These secondary findings help create a complete picture of nutrition management rather than focusing on single dietary changes.
This consensus builds on previous research and expert guidelines by synthesizing the most recent evidence into one comprehensive document. It represents an update to earlier recommendations by incorporating newer studies on specific foods, nutrients, and dietary patterns. By focusing on evidence-based recommendations rather than outdated practices, this consensus helps move away from overly restrictive diets that may not be necessary and toward personalized approaches based on current science.
The consensus does not provide a one-size-fits-all diet because inflammatory bowel disease affects individuals differently. What works for one person may not work for another, so recommendations must be personalized. The review focused on published research, which may not capture all individual experiences. Additionally, many nutrition studies in IBD are small or have limitations, so some recommendations are based on moderate rather than strong evidence. The consensus is targeted at adults and may not apply to children with IBD. Finally, because this is a Brazilian consensus, it reflects the food availability and healthcare context in Brazil, though the underlying science applies globally.
The Bottom Line
Work with your healthcare team, ideally including a dietitian familiar with IBD, to develop a personalized nutrition plan based on your disease stage and individual tolerances. During flare-ups, focus on easily digestible foods and adequate nutrition. During remission, work toward a balanced diet that supports overall health and prevents future flare-ups. Consider supplementation for nutrients you may not be getting enough of, such as iron, calcium, vitamin D, and B vitamins. These recommendations have strong support from expert consensus and current research.
People with Crohn’s disease or ulcerative colitis should use these guidelines with their healthcare provider to improve symptom management. Gastroenterologists and general practitioners treating IBD patients should reference this consensus when counseling patients about diet. Nutritionists and dietitians working with IBD patients can use these recommendations as an evidence-based framework. Healthcare administrators and insurance companies can use this to inform coverage decisions for nutritional therapy. People with family histories of IBD may find this information helpful for understanding disease prevention strategies.
Changes in diet may reduce symptoms within days to weeks during active disease, though individual responses vary. During remission, consistent good nutrition may help prevent flare-ups over months and years. Some nutritional deficiencies take weeks to months to correct with supplementation. It is important to work with your healthcare team to monitor progress and adjust your nutrition plan as needed.
Frequently Asked Questions
What foods should I avoid if I have Crohn’s disease or ulcerative colitis?
Foods to avoid depend on your individual tolerance and disease stage. Common triggers include high-fiber foods, fatty foods, and dairy during flare-ups, but these vary by person. Work with a dietitian to identify your specific triggers rather than following a generic exclusion diet.
Can diet alone treat inflammatory bowel disease?
Diet is an important part of managing IBD but not a replacement for medical treatment. Nutrition supports healing and reduces symptoms alongside medications prescribed by your doctor. The 2026 consensus emphasizes nutrition as part of comprehensive disease management.
What supplements do people with IBD typically need?
People with inflammatory bowel disease often need supplementation for iron, calcium, vitamin D, and B vitamins due to malabsorption and dietary restrictions. The specific supplements you need depend on your individual deficiencies, which should be tested and monitored by your healthcare provider.
Is there a specific diet that works best for inflammatory bowel disease?
No single diet works for everyone with IBD. The 2026 consensus recommends personalized nutrition plans based on disease stage, individual food tolerances, and nutritional status. What helps one person may worsen symptoms for another, so working with a dietitian is important.
How does nutrition differ between active disease and remission?
During active flare-ups, focus on easily digestible foods and adequate nutrition to support healing. During remission, work toward a balanced diet with more variety to support overall health and prevent future flare-ups. Your healthcare team can help adjust your diet as your disease activity changes.
Want to Apply This Research?
- Log daily food intake and symptom severity on a scale of 1 to 10, tracking which specific foods correlate with symptom improvement or worsening over 2 to 4 week periods
- Use the app to identify your personal trigger foods and safe foods, then build meal plans around foods that you tolerate well during active disease and gradually reintroduce variety during remission phases
- Track nutritional intake against recommended targets for calories, protein, fiber, iron, calcium, and vitamin D, adjusting based on disease activity and working with your healthcare provider to identify and correct deficiencies
This article summarizes expert consensus on nutrition management of inflammatory bowel disease and is for educational purposes only. It does not replace professional medical advice. If you have Crohn’s disease, ulcerative colitis, or suspect you may have inflammatory bowel disease, consult with a gastroenterologist and registered dietitian for personalized diagnosis and treatment. Do not make significant dietary changes or start supplements without discussing with your healthcare provider, as individual responses vary and some changes may affect medication effectiveness or disease management.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.