Why do fully cooked red kidney beans make me soo sick?

Red kidney beans contain a type of lectin called phytohemagglutinin (PHA). PHA is a toxic protein that can cause food poisoning if ingested in large amounts. Symptoms of PHA poisoning can include nausea, vomiting, diarrhea, abdominal pain, and fever. In severe cases, PHA poisoning can lead to kidney damage.

The amount of PHA in red kidney beans varies depending on the variety of bean and the cooking method. Soaking the beans for at least 12 hours and then boiling them for at least 10 minutes can reduce the PHA content by 90%. However, even fully cooked red kidney beans can still contain enough PHA to cause illness in some people.

If you are sensitive to PHA, it is best to avoid eating red kidney beans. You should also avoid eating other foods that contain PHA, such as raw or undercooked beans, lentils, and peas.