The food swaps that make the biggest difference
By Mira Sefton · 14 June 2026 · 4 min read
There are two ways to take the edge off a meal. You can cook a food more gently — that's the other side of this story. Or, when cooking won't fix it, you can swap the food out for a gentler one.
Some foods only respond to swapping. You can't cook the gas out of onion powder or a Jerusalem artichoke. So here are the swaps that make the biggest difference — the ones where changing one ingredient takes a dish from harsh to easy-going.
The single biggest swap: drop the powders
If you do one thing, make it this. Onion powder is the harshest single food in our whole database — deep in the red — because drying concentrates its fructans into a tiny, potent sprinkle. Garlic powder isn't far behind.
The fix isn't to cook them differently. It's to rebuild that savoury hit another way: onion- and garlic-free stock, a spoon of infused oil for the aroma, and a little nutritional yeast or miso for body. That swap takes you from the top of the red band right down into green — the biggest drop we can show you.
It's worth knowing because these powders hide everywhere — stock cubes, packet seasonings, gravy, most jarred sauces. Half the battle is spotting them on the label.
When you can't cook it gentler, swap it
A handful of foods are gas factories no matter what you do, because the trouble is a rapidly fermented fibre or fructan that cooking can't remove:
- Jerusalem artichoke — one of the most concentrated fructans there is. Swap to water chestnut for the same sweet crunch and you go from amber straight to green.
- Added inulin / chicory-root fibre (in a lot of "gut health" bars and cereals) — rapidly fermented, so it's a strong wind trigger in a pouch. Swap to psyllium, a gel-forming fibre that firms output and ferments far more slowly.
- Wheat bran — sharp, insoluble, speeds everything up. Swap to oat bran or psyllium for soluble fibre that's far gentler.
These are the swaps people miss, because they look "healthy" on the packet. The score tells a different story.
Everyday swaps that punch above their weight
Most swaps aren't dramatic, but they add up — and these are the ones you'll reach for again and again:
- Honey → pure maple syrup. Honey is high in excess fructose; maple is low-FODMAP and just as sweet. A genuine like-for-like.
- Whole nuts → smooth peanut butter. Peanuts are gentle, and a smooth butter loses the coarse residue whole nuts leave behind. Big drop for almonds, hazelnuts, brazil nuts and the rest.
- Dried fruit → a small serve of fresh. Drying concentrates the sugars; a few fresh strawberries or grapes are far easier than a handful of raisins or dried figs.
- Dried beans → canned-and-rinsed, or firm tofu. Rinsing washes the gassy carbs into the water you tip away.
- Regular milk → lactose-free milk. Same dairy character, none of the lactose.
Two levers, one calmer gut
Cooking and swapping work together. Onion is the perfect example: you can cook it gentler (infused oil), and you can swap it (chives, spring-onion greens). For most meals you'll mix the two — boil-and-drain the veg you keep, and swap out the one or two ingredients that are really driving the score.
If you want to find the swap for a specific food, the Swap Explorer lists them all, ranked by how much gentler you can go.
The biggest-difference cheat sheet
| Swap this | For this | Why |
|---|---|---|
| Onion / garlic powder | Onion-free stock + infused oil + nutritional yeast | Powders are the most concentrated FODMAP we score |
| Onion, garlic, shallot, leek | Infused oil + chives / leek green tops | Fructans don't dissolve into oil |
| Jerusalem artichoke | Water chestnut | Same crunch, none of the fructan |
| Added inulin / wheat bran | Psyllium / oat bran | Soluble fibre instead of a fermenting one |
| Honey | Pure maple syrup | Low-FODMAP, same sweetness |
| Whole nuts | Smooth peanut butter | Drops the coarse residue |
| Dried fruit | A small serve of fresh | Undoes the concentrated sugar |
| Dried beans | Canned & rinsed, or firm tofu | Rinsing removes the gassy carbs |
| Regular milk | Lactose-free milk | Same milk, no lactose |
One honest note
These are modelled estimates, not lab measurements — our best read of how foods tend to behave, and we'll always say when something is more of an educated guess than a measured fact. Everyone's gut is different, so treat a swap as a starting point, change one thing at a time, and see how you go.