FODMAP food guide
Is sourdough wheat bread low FODMAP?
FODMAP score
30
Low FODMAP
Yes — Sourdough Wheat Bread is low FODMAP in normal servings and is generally well tolerated by people with IBS.
FODMAPs present
Low-FODMAP serving
2 slices (~109 g)
Becomes high FODMAP at
beyond n/a - no tested band is published beyond the 2-slice serve; treat 3 or more slices as untested rather than assumed safe
Genuine long-fermented white wheat sourdough is lower in fructans than regular bread; wholemeal sourdough is higher.
Seen a different rating somewhere else?+
Usually it's a portion difference, not a disagreement. This page scores sourdough wheat bread at a serving of 2 slices (~109 g); at n/a - no tested band is published beyond the 2-slice serve; treat 3 or more slices as untested rather than assumed safe it belongs in the high band. A source quoting the larger serve will call it high, and one quoting the smaller will call it low — the same food, measured at two different amounts.
Based on published FODMAP research and reviewed reference data. Informational only — not medical advice. Tolerance is individual; verify with a dietitian during the elimination phase.
How much is OK?
This food's verdict depends on the serving. The bands below show where the load builds, group by group.
Fructans
The generous serve depends entirely on genuine long fermentation: a wild starter left to work for roughly 12-24 hours lets the bacteria consume much of the flour's fructans, which is why the tested serve is about four times a plain white slice. Supermarket loaves labelled sourdough-style are usually baker's-yeast breads proofed for a couple of hours, sometimes with added vinegar or sourdough flavouring - they get none of that reduction, so treat them as regular white bread at 1 slice. The 109 g figure is roughly two generous bakery slices; thin slices weigh far less, so this is a weight limit more than a slice count.
Bands reflect published FODMAP research for typical preparations — individual tolerance varies, especially mid-reintroduction.