hello and thank you for submitting your question. If you have too many red blood cells, you may have a condition called Polycythemia Vera. If so, this is due to a genetic mutation and diet plays a minimal contribution. Regardless, it is best to eat a well-balanced diet full of fruits and vegetables, low in saturated fats and sodium, and moderate in redmeat. It is important to maintain adequate hydration. If you have to much iron, you may have a condition called Hemochromatosis. If this is the case, it is important to maintain a well-balanced diet but to limit your intake of iron. It is important to note that neither polycythemia vera nor hemochromatosis can be cured by diet & future phlebotomy may be necessary, as determined by your doctor.