Fish is an excellent source of iron, according to the Centers for Disease Control and Prevention. The iron found in fish and other meats is absorbed in the body nearly two to three times faster than the iron found in plants.
Iron is a mineral that is necessary to the body and is found in all cells in the body, says the CDC. One function that iron serves in the human body is to carry oxygen from the lungs throughout the entire body. Iron also helps muscles to store and use oxygen. Too little iron in the diet can lead to iron deficiency, the leading cause of anemia in the United States, according to the CDC. Iron deficiency can cause fatigue in adults and impair memory and other mental function in teenagers.