Fermented Soybean (Natto)
Fermented Soybean (Natto) is low risk in a normal serving and a good everyday choice for most people with gout. A typical 45 g serving has about 51 mg of purines, about 13% of a ~400 mg working daily target. It is relatively high in purines per 100 g, but plant purines are only weakly linked to flares, so it stays a safe choice.
General information, not a substitute for advice from your doctor or dietitian.
How much can I eat?
A typical serving is about 45 g, which delivers 51 mg of purines, or about 13% of a ~400 mg working daily target.
You could have up to about 1 cup (175 g) before this reaches half a ~400 mg working daily purine target.
These are plant purines, which research links far more weakly to flares: the 51 mg here counts as roughly 15 mg toward your gout risk.
Fermented Soybean (Natto) is an easy choice to keep on hand.
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Why grade A
Low risk in a typical serving. A great everyday choice for a gout-friendly diet.
Per 100 g (for comparison)
Moderate for gout (50–150 mg/100g).
Low for gout (< 3 g/100g).
Fructose here is a category-level estimate, not a direct measurement for this food.
Processing: NOVA 3 of 4 (processed food). How processing affects the grade.
These are plant purines. Research links purines from vegetables, legumes, and mushrooms far more weakly to gout flares than purines from meat and seafood, so the per-100g figure overstates the real risk here.
Eating fermented soybean (natto) as part of a bigger dish? The Dish Decoder grades the whole plate, ingredient by ingredient.
Other forms of soybeans
Different cuts, species, or preparations vary in purines. The most common form of "soybeans" is shown first below.
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