Are Unsoaked Beans Poisonous?

Beans contain a compound called lectin. Lectins are glycoproteins that are present in a wide variety of commonly-consumed plant foods. Some are not harmful, but the lectins found in undercooked and raw beans are toxic.

How many raw beans will kill you?

Just four or five raw kidney beans can trigger the symptoms of toxicity. Within one to three hours of consumption of the raw beans you can experience extreme nausea and vomiting, with diarrhea and abdominal pain developing afterwards.

What happens if you eat beans that aren't fully cooked?

If you do eat undercooked beans, look for symptoms of food poisoning. You may have nausea, vomiting, and diarrhea. You may also have cramps or abdominal pain. Generally, these symptoms appear within 3 hours of eating the beans.