Peanuts
Legumes & Tofu · Legumes
Peanuts are not nuts. They ripen underground on a legume plant, related to chickpeas and lentils rather than to almonds, and they still come out green: a small handful, 20 peanuts or 32 g, carries 0.05 g of GOS, half the 0.1 g mark at which a portion starts counting as moderate. The legume that snacks like a nut is also the cheapest one on the shelf.
Last updated 4 September 2026Serving sizes for peanuts
The tested serve is a small handful, 20 peanuts or about 32 g, rated green on 0.05 g of GOS.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| Small handful (20 peanuts) | 32 g | GOS 0.05 g |
Breakdown for 1 small handful
Is peanuts low FODMAP?
GOS is the only group recorded, and there is little of it: 0.05 g in the handful, half the level where a portion turns moderate. That is a legume reading that behaves like a nut reading, and the explanation is what the seed is built from. A peanut stores its energy as oil, not as the starch and sugar chains packed into a kidney bean, and roughly half its weight is fat, which nothing in your gut ferments. GOS still counts towards the day, since no one carries the enzyme to break it down before the bowel, but this handful contributes about what ten walnut halves do.
Peanuts and IBS: what to know
The catch is the setting, not the peanut. Twenty peanuts is a genuinely small handful, and the places peanuts appear — a bowl on a bar, a packet on a plane, an open bag on the sofa — are precisely the places nobody counts. Tip a portion into a dish and put the bag away if that pattern is yours. Coatings are the second thing to watch, because dry-roasted and barbecue seasonings frequently carry onion powder or garlic powder, both rated red in this guide, and honey-roasted peanuts are peanuts plus a sweetener that is red on its own.
Gut-friendly ways to eat peanuts
Whole peanuts take over the crunch jobs: scattered across rice noodles, thrown into a stir-fry at the last moment, crushed over a salad or roasted for a snack bowl. Peanut butter has its own entry with its own tested serve, so look that up rather than assuming the spread and the whole nut trade weight for weight. Satay is the dish to make yourself, since bought sauces almost always begin with garlic and onion; peanut butter loosened with tamari, lime juice and fresh ginger gets you most of the way there. Buy them plain or salted rather than seasoned.
Frequently asked questions
How many peanuts can I eat with IBS?
Twenty peanuts, about 32 g, is the amount our data covers and it sits comfortably inside green on 0.05 g of GOS. Larger handfuls have not been measured, so the guide cannot put a figure on them, though the GOS in the tested portion is light enough that the usual limits people meet are appetite and salt rather than fermentation.
Are peanuts a nut or a legume?
A legume, botanically. The plant flowers above ground and then buries its developing pods, which is why peanuts are dug rather than picked. It matters less than you would expect for FODMAPs, since the GOS load is a fraction of what a comparable weight of beans carries, and it matters not at all for peanut allergy, which is about protein rather than fermentable sugar.
Is peanut butter low FODMAP as well?
It has its own green entry, measured in tablespoons rather than in whole nuts, so check that page for the serve instead of converting from this one. The short version is that grinding concentrates the peanut, which is why a spread portion and a snack portion are not the same quantity of peanut. Plain jars beat sweetened ones either way.
Can I eat peanuts during the elimination phase?
Yes, at the tested handful, which makes them one of the few cheap, filling snacks available while the safe list is at its shortest. Keep them plain, because the seasonings on flavoured varieties are where onion and garlic reappear. If you are also eating legumes at dinner, remember that both draw on the same GOS total for the day.
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