Type A's are biologically predisposed to heart disease, cancer, and diabetes. These are your risk factors, but they need not be your destiny. You can can eat all grains, but should go easy on wheat as this is acid-producing.
Grapefruit is fine as well as lemons.
No bananas or coconut. This gives you a general idea. IT's best to get the book. If you can't afford it, get it from the library and copy the chapter on type A blood. A couple of points.