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One of the most common causes for high iron in the blood is a genetic condition called Hemachromatosis. Taking too many iron supplements can also be a common cause of high blood levels.
A side effect of frequent blood transfusions in which the body accumulates abnormally high levels of iron
Iron is an essential trace element; it is necessary for the formation of red blood cells and certain enzymes. At the other extreme, high levels of iron can be poisonous.
Iron levels in the body are measured by both hemoglobin and serum ferritin blood tests.
If your iron levels are too low, then eat foods that contain iron and take iron supplements. If you cannot correct low iron by diet alone, you should see a doctor. You certainly want to see a doctor if your low iron levels are accompanied by dark urine or black and tarry fecal matter. Those symptoms could indicate internal bleeding which could be caused by ulcers, internal injuries, or cancer, among other serious things. If your iron levels are too high, then stop any iron supplements and remove some foods with high levels of iron from your diet. If you have a disease like hemochromatosis that causes you to have excessive iron levels, then chelating drugs, frequent blood donations, or phlebotomy (bloodletting) may be required. Your doctor should tell you what to do in that case. Women of childbearing age rarely have excessive iron levels unless they overdose on supplements, since menstruation removes blood from their systems.
Iron
High blood pressure due to high sodium levels, and high mercury levels in the blood.
High iron in the blood is most commonly caused by hemochromatosis, a common genetic disorder.
Blood tastes metallic likely due to the high levels of iron in it. So blood tastes like car keys, rather than car keys tasting like blood. :)
Iron is vital because is used in the production of haemoglobin (blood). Low iron levels equals low bloor levels. Iron is usually suggested for women because they lose blood during their period.
Azotemia or uremia means high blood levels of nitrogenous waste.
High ferritin (iron) levels can cause insulin resistance. This is particularly likely for men and post-menopausal women as our bodies have no way to get rid of iron, other than bleeding. So, yes, dumping some excess iron through donating blood may improve insulin sensitivity which in turn can improve blood glucose levels.