One day an old man came to the hospital. He says to the doctor "I feel so tired all the time these days. Is there anything wrong with me or am I getting just too old?"
"I think you have anemia. Anemia is a disease in which you feel tired because your red blood cells are not as strong as they should be and they just can't carry as many oxygen as they should. You also have not as many red blood cells as you should have so that makes their job really difficult.
There are a few ways to keep your red blood cells healthy. You should just eat iron food and exercise often. Iron food is good because that increases you red blood cells and that is good. Exercise will just keep your red blood cells strong and hopefully they will become stronger in the future" 
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