Inflammatory bowel disease (IBD) is the collective term for long-term conditions in which the digestive tract becomes inflamed. The principal forms are Crohn’s disease and ulcerative colitis. Crohn’s can affect any part of the gut and may involve the full thickness of the bowel wall; ulcerative colitis affects the colon and rectum, beginning in the innermost lining.
IBD is not the same as irritable bowel syndrome. Typical symptoms include persistent diarrhoea, abdominal pain, blood or mucus in the stool, tiredness and unintended weight loss. Joint, skin, eye and liver problems can also occur. Symptoms often fluctuate between flares and remission.
Severe abdominal pain, continuous rectal bleeding, vomiting blood or material resembling coffee grounds, marked dehydration or rapidly worsening illness requires urgent assessment. Persistent diarrhoea, recurrent pain or blood in the stool should be discussed promptly with a GP.
Diagnosis and treatment
Assessment may include blood tests, stool calprotectin, endoscopy with biopsies and imaging. Treatment aims to control inflammation, maintain remission and prevent complications. Steroids, aminosalicylates, immunomodulators, biologic or targeted medicines, nutritional therapy and surgery may all have a role. Monitoring remains important even when symptoms are quiet.
Food and everyday management
There is no single diet for Crohn’s disease or ulcerative colitis. During remission, a varied balanced diet generally supports nutritional status. During a flare, some people tolerate softer or lower-fibre foods more comfortably; strictures may make particular textures unsafe. Major restrictions should therefore be planned with an IBD dietitian or clinical team.
Inflammation, blood loss, diarrhoea, surgery and medicines can alter iron, vitamin B12, folate, vitamin D, calcium, zinc and magnesium status. Laboratory assessment is more useful than guessing. Adequate protein and energy matter, particularly during active disease or recovery.
A food and symptom diary may identify personal tolerances without blaming food for immune-driven inflammation. Smoking is particularly harmful in Crohn’s disease. Gentle activity, sleep support and psychological care can help with the wider burden of an unpredictable long-term condition.
Useful supplements
Supplements should be selected for the individual rather than used automatically. Product directions and advice from an appropriately qualified professional should take precedence over general information.
| Supplement | Effects |
|---|---|
| Vitamin D3 | Corrects deficiency, which is common in IBD, and supports normal immune regulation and bone health. |
| A high-potency multivitamin and mineral formula containing B vitamins, zinc and magnesium | Helps address combined inadequacies resulting from low intake or impaired absorption; zinc and magnesium status can be affected in IBD. |
| Krill oil or marine fish oil | Provides omega-3 fats with anti-inflammatory activity, although evidence for maintaining IBD remission is inconsistent. |
| Iron gluconate | Replaces iron when blood tests confirm deficiency caused by bleeding or reduced absorption. Oral iron can aggravate digestive symptoms and should be supervised. |
| A mixed-strain probiotic | Supports beneficial intestinal microorganisms. Benefits depend on the strain and IBD subtype and are stronger in some forms of ulcerative colitis than in Crohn’s disease. |
| Broad-spectrum plant digestive enzymes | Assist food breakdown and may support nutrient availability, but do not treat bowel inflammation. |
| A botanical colon-support formula containing FOS, garlic, peppermint, fennel, psyllium and bifidobacteria | Intended to support bowel regularity and beneficial bacteria. Fibre and fermentable ingredients can worsen symptoms during a flare or when narrowing is present. |
| Broad antioxidant support containing vitamins C and E, zinc and quercetin | Supports antioxidant defences and normal tissue repair; concentrated doses are not a substitute for anti-inflammatory treatment. |
| Aloe vera juice | Traditionally used to soothe the bowel and support microbial balance, but evidence is limited and some products can cause diarrhoea. |
| Hop alpha acids | Have anti-inflammatory properties and may help discomfort, although clinical evidence is limited and medicine interactions require consideration. |
The gastroenterology team should know about all supplements, particularly before surgery, during pregnancy or while immune-modifying medicines are used.
Looking for personalised nutrition and lifestyle support? An FNTP member may be able to help you explore an approach suited to your individual needs. Find an FNTP practitioner.
This article is for general education and does not replace individual medical advice, diagnosis or treatment.
