Iron deficiency may often cause severe fatigue, body weakness, and other health ailments. People lacking it cannot perform normal functions in an optimal way. Furthermore, women and children need more iron than men, and anemia strikes them particularly hard. Severe deficiency may cause progressive skin ailments that cause brittleness of nails and extra smoothness in the tongue area. The enzymatic processes that require iron and protein will not occur and the body metabolism can slow or even shut down. Anemia is considered the most common global nutritional deficiency.