Spring onion (white bulb)
Is spring onion (white bulb) low FODMAP?
Spring onion (white bulb) is moderate FODMAP, safe in limited portions (Safe to 1/3 cup (32g)).
The white bulb is far more concentrated in fructans than the green tops, low only at about a third of a cup and high beyond. When in doubt, cook with the green tops for onion flavor and treat the bulb as a small accent, not a base.
FODMAP subgroups to watch
Spring onion (white bulb) contains fructans that can drive SIBO symptoms.
Portion threshold
High in fructans above ~32g. Single typical servings stay in the rated range; larger servings push past the threshold.
SIBO note
Watch this one for ISO (hydrogen sulfide overproduction). Spring onion (white bulb) contains sulfur compounds, and ISO patterns can be more sensitive to these, especially in larger servings.
Low-FODMAP vegetables to try instead
A single food is only half the story. Eating spring onion (white bulb) in a bigger meal? See how it stacks with the rest of your plate.
FODMAP thresholds follow the Monash University Low FODMAP Diet research. Tolerance is individual. Unsibo is a wellness companion; it is not a medical device and does not diagnose, treat, or prevent any condition.