Donating blood is useful for people with iron overload disorders. This is a group of genetic conditions where a person isn’t able to regulate iron absorbtion. Thus it tends to build up in the body….. unless you’re chronically malnourished. As group this is probably the most common type of genetic disease.
Overall, donating blood may lower cholesterol and triglycerides for a few weeks. It also lowers blood pressure. Although it’s debatable if donating blood often enough to keep cholesterol low wouldn’t also result in chronic low grade anemia. It may also, temporarily result in raised pulmonary blood pressure.
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