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According to Wikipedia green beans are legumes.
http://en.wikipedia.org/wiki/Green_bean
"Green beans (American English), French beans or runner beans (British English) are the unripe fruit of any kind of bean,"
and under Bean
"Bean" can be used as a near-synonym of "pulse", an edible legume
The "Seven Deadly Sins"
• Grains (wheat/rice/oats etc) . . . . . • Dairy (milk/yogurt/butter/cheese etc) . . . . .• Nightshades (peppers/tomato/eggplant etc)
• Tubers (potato/arrowroot etc) . . . • Modernly palatable (cashews/olives etc) . . . • Refined foods (salt/sugars etc )
• Legumes (soy/beans/peas etc)