Without iron, there would be no hemoglobin in the blood. Hemoglobin gives red corpuscles their color. And it is the hemoglobin that carries oxygen to all parts of the body. If you lack iron, an insufficient supply of oxygen in your hemoglobin will produce sensations of fatigue, headaches and shortness of breath.
Men don’t have to worry too much: most men have a reserve of iron stored in their body that could last 3 years ! But women, because of the menstrual cycle, need twice as much iron as men.
And the amount is even higher for pregnant women. Vitamin C doubles the amount of iron the body absorbs: so it is a good idea to add a glass of tomato or orange or grapefruit juice to every meal. On the other hand, tea reduces the amount of iron absorbed by 50% and coffee by about 39%.