I have a poor response to beans too. They are high in sugars, thus feed yeast, or maybe I just have an undiagnosed sensitivity to them. I too would like to know why soy is forbidden!
Meanwhile, here's a list of foods that contribute to the gas pains of inflammation-response:
Foods That Contribute to Gas Production Legumes Most beans, especially dried beans and peas, baked beans, soy beans, lima beans