How to Read Food Labels on a Low FODMAP Diet (Hidden Triggers Cheat Sheet)

Cooking from scratch on a low FODMAP diet is straightforward. Packaged food is where the diet gets sabotaged — because FODMAPs hide on labels under names that don't look like food at all.

This is the label-reading system that catches them: five FODMAP families, the aliases each one hides behind, and the judgment calls for ambiguous cases like "natural flavours".

Family 1: Onion and garlic (fructans) — the everywhere problem

Onion and garlic are the highest-impact hidden FODMAPs because they appear in a huge share of savoury packaged foods and trigger symptoms at small doses. On labels they appear as:

• Onion powder, dried onion, onion extract, toasted onion
• Garlic powder, granulated garlic, garlic salt
• "Dehydrated vegetables" (in stock cubes and instant noodles — almost always onion)
• "Natural flavouring" in savoury products — sometimes onion/garlic derived (see the judgment calls below)
• Vegetable stock, chicken-style seasoning, bouillon

High-risk products: stock cubes, gravy powder, seasoning packets (taco, fajita, cajun), marinades, salad dressings, BBQ and tomato sauces, crisps in any flavour other than plain salted, sausages and burgers (see our sausage guide), instant soups and noodles.

The oil exception: garlic-infused oil is genuinely low FODMAP — fructans are water-soluble, not oil-soluble, so the flavour transfers without the FODMAP. This is the single most useful loophole in low FODMAP cooking.

Family 2: Wheat, rye and barley (more fructans)

Beyond the obvious bread and pasta, grain fructans hide as:

• Wheat flour, wheat starch, semolina, durum, couscous (see couscous)
• Rusk, breadcrumbs (in sausages, meatballs, crumbed anything)
• Barley malt extract — the reason most cornflakes only test low FODMAP at small serves
• Rye in crispbreads and "multigrain" anything

Nuance worth knowing: small amounts matter less here than with onion/garlic. Soy sauce contains wheat yet tests low FODMAP at 2 tablespoons, because fermentation and dose keep the fructan load trivial. Wheat as a main ingredient is the problem; wheat as the fifth ingredient in a splash-sized condiment usually isn't.

Family 3: Excess fructose — the sweeteners

Fructose becomes a FODMAP problem when it outruns glucose absorption. Label names:

• Honey (details here), agave syrup/nectar
• High fructose corn syrup (HFCS) — sodas, cereal bars, ketchups
• Fruit juice concentrate (apple and pear concentrate are the worst — both high FODMAP fruits)
• Crystalline fructose, "fruit sugar"

Safe sweeteners to see instead: plain sugar (sucrose — glucose and fructose in balance), glucose syrup, maple syrup, rice malt syrup, dextrose.

Family 4: Polyols — the "-itol" endings

Sugar alcohols are poorly absorbed by design, which is exactly what makes them FODMAPs:

• Sorbitol (E420), mannitol (E421), xylitol (E967), maltitol (E965), isomalt (E953)
• Found in: sugar-free gum and mints, "no added sugar" desserts, diabetic confectionery, some medications and toothpastes

The rule is simple: -itol on a label of something you'll eat more than a bite of → skip it during elimination. Sugar-free gum is the classic unexplained-bloating culprit. (Erythritol is partially an exception — mostly absorbed before the colon and better tolerated by many, but treat it cautiously during strict elimination.)

Family 5: Added fibres and lactose

Two quieter categories complete the sweep:

• Inulin / chicory root fibre / oligofructose / FOS — concentrated fructans added to boost fibre claims. Common in protein bars, "gut health" cereals and high-fibre yogurts — often marketed at exactly the people they'll hurt. Ironically labelled "prebiotic", which is technically true: it feeds bacteria. That fermentation is the symptom mechanism.
• Milk solids, skim milk powder, whey (non-isolate) — lactose carriers in creamy sauces, chocolate, instant mashed potato and protein powders. Hard cheeses and butter are fine (trace lactose); "creamy" powders and fillings are not. Whey protein isolate is low-lactose and generally safe; whey concentrate is not.

The judgment calls

"Natural flavours" — usually fine in sweet products; in savoury products it can mean onion or garlic. If the product is savoury and the brand doesn't answer, treat it as suspect during strict elimination, then test it as its own experiment later.

"Spices" / "herbs and spices" — pure spices are low FODMAP, but blends legally hiding garlic and onion under this term exist in some jurisdictions. Same policy: suspect during elimination, test later.

"May contain traces" — irrelevant for FODMAPs. Traces matter for allergy (protein), not for FODMAP load (grams of carbohydrate). Cross-contamination-level amounts cannot trigger a FODMAP reaction.

Certification logos — Monash University and FODMAP Friendly both run certification programs that test finished products. A certification logo beats any amount of label detective work.

Make the label work part of your data

When a packaged food triggers symptoms, the ingredient list is your suspect lineup — log the product, not just "crackers", and note which red-flag ingredient it contained. Over a few weeks, your own reactions will tell you which FODMAP family is your dominant trigger, which turns every future label into a 5-second yes/no instead of a research project.

Check any whole food's rating in the A–Z food database, and see the high FODMAP list for the ingredients worth memorising first.

This article is general information, not medical advice. Label regulations differ by country; when managing a medical condition, verify products with the manufacturer or a registered dietitian.