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?
Up to about 1 cup (175 g) keeps you under half a day's purines.
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: per 100 g and processing
Per 100 g (for comparison)
Moderate for gout (50–150 mg/100g).
Low for gout (< 3 g/100g).
Fructose here is estimated, not measured directly 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.
Diet is part of the picture, not all of it
For most people the body makes the majority of its own uric acid. Food contributes the smaller share. Eating well lowers your risk and helps you feel in control, but for many people diet alone does not bring uric acid down enough to stop flares. Medication often does the heavy lifting. Use these grades to make easier daily choices, and work with your doctor on the full plan.
Other forms of soybeans
The most common form of soybeans is first.
More from Legumes
Bean Curd Lees (Okara)
Beans (adzuki, dried)
Beans, adzuki, dried, raw
Beans (black, canned)
Beans (cranberry, dried)
Beans, cranberry, dried, raw
Beans (great northern, dried)
Beans, great northern, dried, raw
How did fermented soybean (natto) go for you?
Reader experiences, not medical advice. The grade above comes from published data.