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Runner beans contain traces of a poisonous lectin, Phytohaemagglutinin, and hence must be thoroughly cooked before consumption.
The smallest recorded "dose" to produce symptoms was four or five raw soaked beans (incident 2). In this episode, one other person developed symptoms after eating beans casseroled with meat and vegetables in an oven at 150-160°C for three hours, whereas two others who ate only meat and vegetables from the casserole did not.
Melbourne,I heard that the Red Kidney bean was not good for you unless it was cooked.As to the others not so sure. Chefs at where I used to work have all stated the red one is the only one they were wary of.