Wholemeal Bread
Serving sizes
Wholemeal Bread changes rating with portion size. These are the amounts tested in the literature behind our ratings.
- About 1 slice (30g)
- Larger portions
- Much larger portions
Wholemeal bread is Low FODMAP at about 1 slice (30g), with Fructans and GOS building as you eat more.
- At about 1 slice (30g), wholemeal bread is low.
- Fructans and GOS from the wheat build with each extra slice, reaching moderate at larger portions and high at much larger portions.
Enjoy about 1 slice (30g) as toast or an open sandwich, with low-FODMAP fillings to keep the meal easy on the gut.
Why wholemeal bread is rated low
Wholemeal bread is low at about 1 slice (30g), which is a single slice of toast or an open sandwich. The ladder above that is short and steep: larger portions are already moderate and much larger portions are high, as fructans and GOS build with the amount of bread. That makes the serving the whole story here. One slice is something you can build a week around. The same loaf stops being a low choice once it turns into a two slice sandwich, or toast at breakfast, a sandwich at lunch and a slice with dinner.
What changes your risk
- The gap above the serving the climb from about 1 slice (30g) at low to moderate is narrow. Thick bakery slices weigh more than thin supermarket ones, so even a single slice is not always the low serve, and a two slice sandwich is past it.
- Bread across the day low is per serving, not per day. Toast in the morning, a sandwich at noon and a roll at night can each feel modest and still add up. Spreading bread across the day, and giving some meals a different base, keeps the total manageable.
- A sourdough label is not a swap a loaf sold as sourdough is not automatically lower than this one: it depends on the grain, how long it was fermented and how much you eat. A fast supermarket loaf sold as sourdough flavoured has not had a slow fermentation at all and should be counted like ordinary bread.
- What goes between the slices the bread is only part of the sandwich. Onion and garlic hide in relish, chutney, pickle, dressing, deli marinades and hummus, and those are far more likely to unsettle a meal than the two slices holding them.
- Toasting and freezing change nothing heat and cold do not break FODMAPs down. Toasting and freezing are texture and storage decisions only, though freezing pre sliced bread is a genuinely useful way to take out exactly what you planned to eat.
What else works
If you want more bread in a day than the low serve allows, gluten free bread fills the sandwich role directly, and rice cakes or corn thins work for an open sandwich. For a larger grain portion at a meal, rice, oats, quinoa, polenta, buckwheat, potato and gluten free pasta do the job without a bread portion at all. Be careful with the lookalikes: rye bread and multigrain bread are not gentler alternatives, they have their own ladders and sit differently from this one. Wraps, bagels, rolls, baguettes and wheat crackers are the same flour in a bigger or denser package, so swapping to them is not a step down.
How to keep it low
Buy a thin sliced loaf rather than a hand cut one, and weigh a slice once so you know whether your usual loaf is close to about 1 slice (30g). Keep it in the freezer and take slices out as you need them, which makes a one slice serving a decision rather than an accident. Build the sandwich from fillings that are not competing for room: cheddar, swiss or parmesan, eggs, plain meat, poultry or fish, cucumber, carrot and baby spinach, with garlic infused oil or plain mayonnaise instead of a relish. In a sandwich shop, assume the bread is thicker than a supermarket slice and consider an open sandwich on one slice, or ask for the filling in a salad box.
Common questions
is wholemeal bread low fodmap
Yes, at about 1 slice (30g). It moves to moderate at larger portions and to high at much larger portions, so the serving is what decides it.
how many slices of wholemeal bread can i eat on a low fodmap diet
The low serving is about 1 slice (30g). A larger portion is moderate, so a two slice sandwich is enough to move it.
can i have wholemeal bread on the elimination phase
An open sandwich on about 1 slice (30g) is within the low serving, so it is usually workable. Watch what else is bread shaped across the same day. Tolerance is individual, and reintroduction is done with a dietitian.
is sourdough better than wholemeal bread for ibs
Sourdough is not automatically the better choice. Whether a sourdough loaf is low depends on the grain, how long it was fermented and how much you eat, so it is judged on its own rating rather than assumed to be gentler. A loaf simply labelled sourdough flavoured has not had a slow fermentation at all.
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Where this rating comes from
Wholemeal 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.
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.
Informational only, not medical advice. Individual tolerance varies. Talk to a healthcare professional or a dietitian for personal guidance.