Wheat, rice, barley and certain legumes like soybeans are classified as C3 plants, which corresponds to their ability as plants to convert carbon dioxide into energy. (scientificamerican.com)
It helps to know the difference RO is both edible and has been shown to remove neurotoxins from certain legumes. (marksdailyapple.com)
The proteins I find most easy to digest are those from fish, well processed / no casein whey, certain legumes like lentils, quinoa, chia, etc.. (ahealthiermichigan.org)