Cashews
Nuts & Seeds · Tree Nuts
Not really. Cashews are the nut that runs out of room fastest: the smallest tested portion, 10 nuts (10 g), already rates amber on 0.12 g of GOS, and a small handful of 30 g rates red. There is no green serve here at all. If cashews are your desk snack, this is a nut to replace rather than ration.
Last updated 3 September 2026Serving sizes for cashews
The smallest tested portion is 10 cashews, about 10 g, and it already rates amber. A 30 g handful rates red.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 10 cashews | 10 g | GOS 0.12 g | |
| Small handful | 30 g | GOS 0.36 g |
Breakdown for 10 cashews
Is cashews low FODMAP?
One FODMAP group does all the work here. GOS, the same fermentable sugar chain that makes legumes tricky, sits at 0.12 g in 10 cashews, over the 0.1 g line where a portion turns moderate, and reaches 0.36 g in the small handful, past the 0.3 g high threshold. Weight for weight that is denser than almonds, which hold 0.08 g of GOS in a slightly larger 12 g serve and still rate green. A trace of fructans rides along, but it never drives the rating.
Cashews and IBS: what to know
GOS is fermented by gut bacteria in everyone; with IBS you tend to notice the gas that follows. What makes this nut awkward is how invisible it becomes once blended. Cashew cream, dairy-free cheese sauces, trail mixes and many Thai and Indian curries carry it ground beyond recognition, so the dose you eat is rarely the dose you counted. Mid-elimination, treat cashews as a read-the-label food rather than a portion to negotiate. In reintroduction they make a blunt GOS challenge, which is useful only once gentler tests are done.
Gut-friendly ways to eat cashews
Swap the nut, keep the habit. Macadamias, walnuts and pecans all rate green at their tested serves in this guide, and their richer, oilier crunch works in salads, pesto and roasting trays where cashews used to go. Peanuts are the cheapest green-rated option when you want to snack by the handful. If a recipe calls for cashews blended into a sauce for body, soaked macadamias or a spoonful of tahini will thicken it without carrying the GOS.
Frequently asked questions
How many cashews can I eat with IBS?
There is no cleared number. Ten nuts is the smallest portion in the data and it rates amber, meaning caution rather than clearance, and 30 g rates red. During the elimination phase that makes cashews a food to leave out entirely, since even a token few sit in the amber band rather than below it.
Why are cashews higher FODMAP than most nuts?
They carry more GOS per gram. GOS is the group that makes lentils and chickpeas a portion question, and cashews hold enough of it that 10 nuts pass the moderate line while a slightly heavier serve of almonds stays under it. Nobody absorbs GOS in the small intestine, so the whole dose reaches the bowel and ferments there.
Are roasted or salted cashews any different?
No. Roasting and salting do not change the GOS content, because nothing is soaked or drained away in the process, and the roasted nut carries what the raw one did. Salted cashews are arguably worse in practice, since salt makes them far easier to keep eating past the point where you meant to stop.
Which nuts can I eat instead of cashews?
Macadamias, walnuts, pecans, brazil nuts and peanuts all rate green at their tested serves, so any of them can take the cashew slot in a snack bowl or a salad. Do not reach for pistachios as the substitute: they also rate amber at 10 g, though the group driving it there is fructans rather than GOS.
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