Garlic and onions are in almost everything — pasta sauce, stir-fries, dressings, soups, the garlic noodles from your favorite spot. They're also two of the most common reasons people feel gassy and bloated after a meal. If a delicious dinner regularly leaves you uncomfortable, there's a good chance these two are involved.
Here's why they do it — and what you can actually do about it.
The culprit: fructans
Garlic and onions are rich in fructans — a type of fermentable fiber (a "FODMAP"). Fructans are chains of fructose molecules held together by bonds your digestive system can't break. Humans simply don't make the enzyme needed to split them apart.
So instead of being digested and absorbed in your small intestine, fructans travel intact to your large intestine. There, your gut bacteria ferment them — and fermentation produces gas. That gas is what leaves you bloated, crampy, and uncomfortable a couple hours after eating.
Wheat contains fructans too, which is why bread and pasta can hit the same way. (More on FODMAPs and fermentable foods here.)
Why "just avoid them" is harder than it sounds
The standard advice is to cut garlic and onions out. But anyone who's tried knows how impractical that is — they're the flavor base of most cuisines. Onion and garlic powder hide in spice blends, sauces, broths, and packaged foods, so even careful avoidance often falls short.
And restriction has a real cost: you lose foods you enjoy, meals get harder to plan, and eating out becomes stressful. For most people, the goal isn't a fructan-free life — it's being able to eat the foods they love comfortably.
What actually helps
Know where fructans are hiding. This is where it pays to check. Our free FODMAP Scanner app lets you scan a food and instantly see whether it's high in fructans (and which other trigger compounds it contains) — so you're not guessing why a meal bothered you.
Take a short walk after eating. Light movement after eating helps move gas through and eases that bloated, heavy feeling.
Add the enzyme your body doesn't make. Since the issue is a missing enzyme, you can supply one. A fructan-digesting enzyme (fructanase) breaks fructans down as you eat, before they reach the bacteria that ferment them — so there's less left over to turn into gas.
This is exactly what Après is built for. Most enzyme products don't cover fructans at all; Après includes OPTIZIOME® Fructanase at a meaningful dose, alongside enzymes for dairy, beans, and fiber — so a meal with garlic, onions, and a few other triggers is covered in one mint.
The bottom line
Garlic and onions bloat you because of fructans — fibers your body can't break down on its own. You don't have to give them up. Learn where they hide, move a little after meals, and give your body the enzyme it's missing.
