Eat more red meat. It has a significant amount of iron in it. It fat is a reason you don't consume it try eating lean or extra lean meat. Liver is an excellent source of iron. Eat plenty of cereal.
Many cereals are now fortified with iron.
Check the food label and look for iron under the daily values. You should also avoid drinking tea with your meals that are high in iron. Tea contains tannin that will bind iron making it unable to be absorbed. If all else fails, take an iron supplement or a multivitamin that has iron in it. They could cause side effects such as constipation and nausea.