I first came across this information in a pamphlet from the PCRM called "Parents' Guide to Building Better Bones". What I like about this online pamphlet is that it has a chart of calcium sources that is heavy on vegan options and that shows you how much of a food you have to eat to absorb a particular amount of calcium. Some foods have a lot of calcium, but only a little bit of it can be absorbed. It is much better to eat a food with a more modest amount of calcium that you can absorb more of. The chart makes it easy:
http://www.pcrm.org/health/prevmed/building_bones.htmlNote:
Since a sticky is meant to be a reference only, I am locking the thread. If you care to discuss this sticky by all means open up your own thread and link that thread to this sticky.