onion
Vegetables
Is onion inflammation-compatible?
See whether onion fits an inflammation diet, with a clear compatible-or-avoid verdict plus its FODMAP, histamine and other trigger ratings in one place.
Related checkers
Compare onion across criteria
Sensitivity notes
Why inflammation diet checker matters
An anti-inflammatory diet focuses on foods that help reduce chronic inflammation in the body. It emphasizes fruits, vegetables, fatty fish, nuts, and whole grains while limiting processed foods, refined sugars, and certain oils.
- Focus on omega-3 rich foods like fatty fish, walnuts, and flaxseed
- Colorful fruits and vegetables provide anti-inflammatory antioxidants
- Extra virgin olive oil is a cornerstone of anti-inflammatory eating
- Limit refined sugars, processed foods, and industrial seed oils
- Turmeric and ginger are powerful anti-inflammatory spices
Sensitivities
What onion contains
FODMAPs
Histamine & Amines
Plant compounds
Irritants
Additives
Allergens
Diet fit
Where onion fits
Therapeutic diets
Lifestyle diets
Religious diets
What to know about onion
Onion is graded E for fructans and E for total FODMAPs, the top of our scale, which is why it is the single most common trigger people uncover once they start logging food against symptoms. The reaction is a carbohydrate problem rather than an allergy: onion is A for histamine, A for oxalates, A for lectins and A for nightshades, so if onion bloats you the fructans are almost certainly the mechanism. It also grades E for low fermentation SIBO plans. The frustrating part is that fructans are water soluble and heat stable, so caramelizing, slow simmering or fishing the pieces out of a sauce does not make onion any safer, and onion hidden in stock, gravy and spice blends is why so many people react to restaurant food they cannot account for.
Watch for
- Fructans and total FODMAPs both graded E, the highest tier we use, and the grade does not soften between raw and cooked onion
- Cooking is not a fix: fructans dissolve out of the onion into the pan and stay in the liquid, so straining the pieces out leaves the trigger in the sauce
- Hidden onion drives most unexplained flare-ups: stock cubes, gravies, curry pastes, spice rubs, chips and anything listed as seasoning or natural flavor
- Graded E for low fermentation SIBO, so onion is usually one of the first things pulled when working through a SIBO protocol
- Clean on the rest of the chemistry (histamine A, oxalate A, lectin A, nightshade A, with only a borderline B for histamine liberation), which is why an onion reaction is nearly always intolerance rather than allergy
Explore related in Vegetables
Compare similar foods to build a personalized list of swaps that work for your system.
Inflammation Guide
Everything you need to know about inflammation compatibility and smart food choices.
An anti-inflammatory diet focuses on foods that help reduce chronic inflammation in the body. It emphasizes fruits, vegetables, fatty fish, nuts, and whole grains while limiting processed foods, refined sugars, and certain oils.
These foods are typically compatible with a Inflammation approach:
View all safe options
Practical guidance for following a Inflammation diet:
- 1Focus on omega-3 rich foods like fatty fish, walnuts, and flaxseed
- 2Colorful fruits and vegetables provide anti-inflammatory antioxidants
- 3Extra virgin olive oil is a cornerstone of anti-inflammatory eating
- 4Limit refined sugars, processed foods, and industrial seed oils
- 5Turmeric and ginger are powerful anti-inflammatory spices
Pro tip: Keep a food diary to track your reactions. The Triggerbites app makes this easy with automatic pattern detection.
Want personalized tracking?
Download Triggerbites to log meals, track symptoms, and discover your unique triggers.
Get the AppFAQ
Does onion fit an inflammation diet?
Inflammation: fits well for most plans.
What if I eat it occasionally?
Still check preparation and add-ins.
What are safer swaps?
Compare within the Vegetables group.