leek
Vegetables
Trigger checker for leek
See leek rated across every trigger — FODMAP, histamine, salicylate, oxalate, tyramine and more — plus diet compatibility, all in one quick ingredient profile.
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Triggers
Diets
Serving size, prep, and portion notes for leek
Leeks are a high-FODMAP allium: the white base is loaded with fructans, the same trigger that makes onion and garlic so hard on IBS. The dark green tops hold far fewer fructans, so the classic trick is to cook with the greens for flavour and leave the white part out, exactly the way you would use scallions. Leeks are otherwise low in histamine and salicylates.
Watch for
The white bulb is very high in fructans, a frequent IBS, bloating and gas trigger / The green tops are much lower in fructans, so use the green part and discard the white / Cooking or sauteing does not remove the fructans; they are water-soluble and stay in the dish / Mildly higher in nickel than many vegetables, a minor point on a strict low-nickel diet
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FAQ
What does the FODMAP rating mean for leek?
High FODMAP: consider smaller servings or swap within the same group.
Is leek generally well tolerated?
Fructans (Avoid) and FODMAPs (High) Start with those if you react.
What should I check next?
Compare within the Vegetables group.