Rye Bread

High FODMAP

By Michael EisenwasserUpdated October 6, 2026

Tested serving

2 slices (86g) High

Rye bread is High FODMAP at 2 slices (86g), driven by Fructans with GOS and Excess Fructose adding to the load.

At 2 slices (86g), rye bread is high.
Fructans in the rye grain lead, with GOS and Excess Fructose adding to the total.

For a sandwich, reach for a certified gluten-free bread and keep rye as an occasional thin slice.

Why rye bread is rated high

Rye bread is high at 2 slices (86g), the amount a sandwich uses, and it carries fructans, GOS and excess fructose together. There is no low amount to aim for, so the honest picture is that a closed rye sandwich is high before anything goes inside. Rye is a bread to set aside during elimination rather than one to portion around.

What changes your risk

How many slices go on the plate 2 slices (86g) is high. A dense loaf cut thick reaches that weight quickly, so a slice is not a fixed amount and the weight matters more than the count.
Open sandwich versus closed a lid doubles the bread, which is exactly the 2 slices (86g) that rates high.
Stacking with other fructan foods rye already starts high, so there is no room left in the meal. Rye crackers and crispbread come from the same grain, and wheat rolls, wraps or an onion heavy topping in the same sitting add to the same fructan total.
A sourdough label a rye loaf called sourdough is still rye, and the label alone tells you nothing about how the loaf behaves. Treat it as rye bread.
Toasting, freezing and staling change nothing none of them break fructans or GOS down, so a toasted or day-old slice rates the same as a fresh one.

Swaps

For the dark, savoury, hold a topping role that rye plays, gluten free bread is the closest direct swap, and many seeded gluten free loaves look and behave much the same. Plain rice cakes and polenta also carry a savoury topping well. Build on top with cheddar or swiss, eggs, plain fish such as smoked salmon, cucumber, baby spinach and chives, with garlic infused oil rather than a garlic spread. What is not a swap: pumpernickel and other rye loaves, rye crispbread, wheat crackers and multigrain bread, all of which bring fructans of their own.

How to lower the load

During elimination, leave rye bread out and keep a gluten free loaf in the freezer instead, so there is always something to toast. When you come to test rye, do it with a dietitian, starting well below 2 slices (86g) and keeping the rest of the meal plain. The Scandinavian open sandwich shape still works with a gluten free base: one slice, topping built up generously, a side salad to make it a real meal. Delis and cafes cut rye thick and serve it doubled, so ask what other breads they have, or have the filling as a plate. Toppings deserve the same attention as the bread, since onion and garlic show up in pickled relishes and creamy dressings.

Common questions

is rye bread low fodmap

No. Rye bread is high at 2 slices (86g), the amount in an ordinary sandwich.

how much rye bread can i eat on a low fodmap diet

2 slices (86g) is high, and there is no low amount given for it. Most people leave it out during elimination and test it later with a dietitian.

is rye bread high in fructans

Yes. Fructans are a main driver, alongside GOS and excess fructose, and together they make 2 slices (86g) high.

can i eat rye bread on the elimination phase

Rye bread is high, so it is not among the low foods that phase is built on. Most people leave it out and use gluten free bread instead. Reintroduction is planned with a dietitian.

Learn more

Where this rating comes from

Rye Bread is rated from published lab measurements of its FODMAP content, using the low, moderate and high cutoffs of Varney et al. (2017).

Feedback sent through the FODMAP Foods app has led to changes in this list.

See our full rating method →

Sources

Fructan and free fructose content of common Australian vegetables and fruit. Muir et al. (2007), J. Agricultural and Food Chemistry 55(16):6619-6627.
Measurement of short-chain carbohydrates in common Australian vegetables and fruits by high-performance liquid chromatography (HPLC). Muir et al. (2009), J. Agricultural and Food Chemistry 57(2):554-565.
Quantification of fructans, galacto-oligosaccharides and other short-chain carbohydrates in processed grains and cereals. Biesiekierski et al. (2011), J. Human Nutrition and Dietetics 24(2):154-176.
Dietary sorbitol and mannitol: food content and distinct absorption patterns between healthy individuals and patients with irritable bowel syndrome. Yao et al. (2014), J. Human Nutrition and Dietetics 27(Suppl 2):263-275.
FODMAPs: food composition, defining cutoff values and international application. Varney et al. (2017), J. Gastroenterology and Hepatology 32(Suppl 1):53-61. Supplies the low, moderate and high cutoffs used on this page.