A tool that helps you understand dietary triggers across inflammatory, autoimmune, and digestive conditions. Built for people managing real conditions, not generic diet advice.
Most trigger food guides are generic printouts. GutCheck is interactive, condition-aware, and gets smarter the more you use it.
Important: This is not medical advice. It presents information from NHS guidance, published research, and patient communities. Always discuss dietary changes with your doctor or dietitian.
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What you can do
Five practical tools built around your specific combination of conditions:
F
Food browser
130+ foods flagged by condition, with swap suggestions and explanations of how each food typically affects your specific conditions.
D
Ingredient decoder
Paste a product label or scan a barcode to see what is flagged for your conditions.
E
Eating out guide
Restaurant cuisine advice that adapts to your condition combination.
J
Personal journal
Track your own reactions to build a personalised trigger profile over time. The most reliable source of truth is your own body.
S
Simple mode
A stripped-back view for when decision-making is exhausting. Useful during flares, fatigue, or sensory overload.
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How evidence works
Not all dietary information has the same strength of evidence. GutCheck labels every trigger flag with one of three tiers so you can decide what to trust:
NHS / Clinical
Documented in NHS guidance, NICE guidelines, or established clinical frameworks like the Monash FODMAP protocol.
Research
Supported by peer-reviewed research but not yet standard clinical advice.
Patient Reported
Widely reported in patient communities but with limited formal research. Real experiences, weaker evidence base.
Your body is the final word. These tiers tell you how strong the evidence is, but the conditions covered here vary enormously between people. Something flagged high-risk may be fine for you; something flagged safe may be your personal trigger. The Journal tab is where you track what actually affects you.
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Your data stays yours
Everything you do in GutCheck stays on your device. Your selected conditions, journal entries, shopping list, and brain fog preferences are stored locally in your browser. Nothing is sent to any server.
You can export your data as JSON at any time from the "My Profile" tab. You can also clear everything in one click.
The only optional feature that goes online is the barcode lookup, which queries the Open Food Facts database - that's a free, open-source project, not a commercial tracker.
Ready to get started? Next step: tell us what conditions you're managing so we can personalise everything.
Install GutCheck
Add to your home screen for offline access and quicker launching.
Not medical advice. This tool presents commonly reported dietary triggers from NHS guidance, published research, and patient communities. Always consult your doctor or dietitian before changing your diet.
GutCheck
Understand dietary triggers across inflammatory, autoimmune, and digestive conditions. Personalised to you.
What conditions are you managing?
Select all that apply. This filters everything to show what's relevant to your specific combination.
Digestive / GI
Ulcerative Colitis
Crohn's Disease
IBS
Coeliac Disease
GERD / Acid Reflux
Inflammatory / Joint
Ankylosing Spondylitis
Rheumatoid Arthritis
Psoriatic Arthritis
Autoimmune
Psoriasis
Hashimoto's Thyroiditis
Everyone is different. The conditions covered here vary enormously between people. A food flagged as "low risk" may still be your personal trigger, and something flagged as "high risk" may be perfectly fine for you. These labels reflect what is commonly reported in research and patient communities, not universal rules. Some mappings are marked "inferred" where explicit guidance for your specific condition was not available but related conditions share the same mechanism. Use the Journal tab to track your own reactions and build a profile that actually reflects your body.
What does "flare" vs "remission" mean for diet?
What do the colours and labels mean?
RiskHighModerateLow
EvidenceNHS / ClinicalResearchPatient Reported
Ingredient Decoder
Paste an ingredient list from a product label and we'll highlight anything flagged for your conditions.
Look Up by Barcode
Enter a product barcode (EAN number from the packaging) to look up its ingredients via Open Food Facts.
Showing foods that are low risk or actively beneficial across all of your selected conditions. These are your safe foundations to build meals from.
About supplements: The supplements listed here have varying levels of evidence. Some (like vitamin D, B12, and iron in IBD) are routinely recommended by NHS and specialist teams. Others (like glutamine and collagen) are heavily marketed but have weak evidence. Always discuss supplements with your doctor, dietitian, or specialist team before starting, particularly if you take medication. Some supplements interact with medications, mask deficiencies that need investigation, or are contraindicated in specific conditions. Thyroid medication users: iron, calcium, and soy-based supplements must be taken at least 4 hours apart from levothyroxine to avoid absorption interference. Get blood tests before supplementing high doses of fat-soluble vitamins, iron, or anything beyond standard multivitamin levels.
Eating Out Guide
Select a cuisine to see what's typically safer and what to watch out for, based on your conditions.
Your Shopping List
Add safe foods from the "What Can I Eat?" tab or manually below. All items are filtered to your conditions.
Log a Food Reaction
Track how specific foods affect you over time. This builds your personal trigger profile. All data stays on your device.
Your Patterns
Foods you've logged with bad reactions. The more entries you add, the clearer the picture becomes.
How Your Conditions Connect
Many inflammatory and autoimmune conditions share underlying immune pathways. This map shows the connections between your selected conditions and the mechanisms they share.
Export Your Personal Summary
Generate a printable summary of your trigger profile filtered to your conditions. Useful to share with a dietitian or GP.
Your Data
All your data (conditions, shopping list, journal entries) is stored locally on this device. Nothing is sent to any server.
Select your conditions above
Choose one or more conditions to see relevant dietary trigger information.