I would like to second Happy's suggestion about leafy green veggies! While many people abhor spinach and other leafy greens, I am a huge believer in them! They not only supply a nice dose of calcium, but also are rich in vitamin A and bioflavinids and many other nutrients. So many options to choose from too, from Romaine lettuce to the aforementioned spinach, to bok choy, Swiss chard, to our staples here down South -- mustard greens, turnip greens and collard greens. Did you know that mustard greens are packed with 9 vitamins and 7 minerals, including the antioxidants: vitamins A, C and E. I had a helping today, in fact!
When cooked soft, leafy greens provide another essential need for AF sufferers, and that is fiber!
And it's surprising, but the human body actually absorbs these nutrients *better* when they leaves are cooked! People taking blood thinners have to watch out for them, though, because they do interfere with those meds.