Overview
About Kidney beans
Kidney beans are a high-FODMAP legume, loaded with galacto-oligosaccharides (GOS), which is the main reason they cause gas, bloating and cramps.
They are also very high in oxalate, high in nickel and high in salicylates, and raw or undercooked kidney beans carry a real toxin: the lectin phytohaemagglutinin, so they must be boiled hard, never slow-cooked from raw.
Sensitivities
How Kidney beans scores
Watch for
What trips people up
- High in GOS, the FODMAP that ferments in the gut and drives the classic bean bloating and wind, especially from dried beans that were not well soaked and drained
- Very high in oxalate, so a frequent trigger if you form calcium-oxalate kidney stones or follow a low-oxalate diet
- High in nickel and high in salicylates, two separate triggers that can show up as skin flares even when the gut copes
- Raw and undercooked kidney beans are toxic: they hold the most phytohaemagglutinin of any bean and must be boiled at a rolling boil for at least 10 to 30 minutes, never left raw in a slow cooker where they only warm to a danger zone
Diet fit
Where it fits
Swap ideas
More alternatives
FAQ
Common questions about Kidney beans
Why do kidney beans cause so much gas and bloating?
Kidney beans are high in galacto-oligosaccharides (GOS), a fermentable FODMAP that humans cannot fully digest. Gut bacteria break it down instead and produce gas, which is what causes the bloating, wind and cramping. Soaking dried beans well and draining and rinsing canned beans washes some GOS away and helps a little.
Do raw kidney beans need to be boiled, and are they toxic?
Yes. Raw and undercooked kidney beans contain phytohaemagglutinin, a lectin that causes nausea, vomiting and diarrhea within a few hours, and as few as four beans can make you sick. Boil them at a full rolling boil for at least 10 minutes (30 to be safe). Do not cook dried kidney beans in a slow cooker from raw, because the low temperature can actually raise the toxicity.
Are kidney beans high in oxalate?
Yes, kidney beans are one of the higher-oxalate legumes, so they are worth limiting if you are prone to calcium-oxalate kidney stones or are following a low-oxalate plan. They are also high in nickel, a common trigger for systemic contact dermatitis.
References
Read the background
Ratings reflect the Triggerbites ingredient database and may vary with portion size and preparation.