Iron needs vary throughout a woman’s lifespan, but from the onset of menstruation, until menopause, women’s iron needs are significantly higher than men’s. Female endurance athletes, pregnant women, vegetarian women and vegetarian adolescents have the highest iron needs of all, and are at the highest risk for iron deficiency.
Iron is needed for the body to produce hemoglobin, a substance in red blood cells that enables them to carry oxygen. Iron deficiency can leave people feeling tired and weak.