Anemia and leukemia are different illnesses with different causes. One does not lead to the other. The only thing they have in common is that they are disorders of the bloof. Anemia affects red cells and leukemia affects white cells predominantly.
There are many types of anemia, iron deficiency anemia is the most common. Eating iron rich foods will help prevent/treat it.
Foods that are a good source of iron include:
lean red meats, including beef, pork, lamb
seafood, such as oysters, clams, tuna, salmon, and shrimp, etc.
beans, including kidney, Lima, navy, black, pinto, soy beans, and lentils
iron fortified whole grains, including cereals, breads, rice, and pasta
greens, including collard greens, kale, mustard greens, spinach, and turnip greens
vegetables, including broccoli, Swiss chard, asparagus, parsley, watercress, Brussels sprouts
chicken and turkey
dried fruits, such as raisins, prunes, dates and apricots