I follow a vegan diet and my proteins come from beans, grains, veggies, nuts, etc. There are certain grains that are really good in terms of protein such as quinoa and amaranth. Basically, everything you eat has protein in it (except some pure fats). Eating a varied diet gives you plenty of protein.
As for blood type diet though, I've read that it is a bunch of hooey psuedo science. Webmd had a really good write up about it but I can't seem to find it.
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