Dr. Michael Greger (below) is a heavy enthusiast for incorporating ground flaxseed into one’s diet (two tablespoons per day for adults), and if you’re vegan or vegetarian he says you should be supplementing with B-12 to the tune of 100 micrograms a day (this apparently brings down inflammation, which is associated with numerous diseases). If you can get past his cornball delivery (which grows on you if you give it a chance, and is kind of endearing), he says a lot of sensible things about the role of diet in relation to disease.
UPDATE: Late this morning, I took his advice and mixed two tablespoons of ground flaxseed with some oatmeal. When heated, it’s kind of gluey in texture, but good.
Prometheus Unbound 