Iron is widely used in orthodox medicine in the form of dietary supplements. A deficiency of iron in the diet or in its absorption leads to anemia with resultant fatigue and breathlessness. Although there is no direct link between a dietary lack of iron and the homeopathic remedy, some homeopaths believe that the remedy helps the body to absorb and utilize iron in the diet more efficiently. Ferrum met. is often needed by well-built people who look healthy but who tend to be weak, feel the cold, and suffer from circulatory problems or anemia. This weakness affects them mentally, making them very sensitive to noise, intolerant of contradiction, and changeable in mood. They dislike moving around because of fatigue and prefer to sit down, but curiously, because of pain or restlessness, they are forced to keep moving. Ferrum met. types dislike eggs and fatty foods, which may upset their digestion, but like tomatoes and sour foods.