Dr told me to take iron supplement when I was anemic after prostate surgery. It helped but can make you constipated

Research iron rich foods ..I just had this problem...when I got my blood work done...yes I eat meats..Red lean beef.. chicken... shrimp so far .. Broccoli..and lots of spinach. .Nuts .... oatmeal for breakfast is good also. With nuts a flax yummy was feeling very low ...and weak feeling great now .. added a multi vitamin with iron in also..