I asked my doc the same question and he said that giving too much blood, even when you don't need to, can cause a drop in iron in the blood. Even though we don't need as much iron as women, since we don't menstruate, we still need it and too much donation will cause an iron deficiency.
Yes my iron levels dropped to below nornal range when i gave blood but i did give 8 pints in 8 weeks thats quite alot s my hematocrit levels were very high.A few weeks later my iron levels were back to normal.
Haemachromatosis is a condition where the body absorbs too much iron into the bloodstream and the cure is to give blood regulary to remove the iron so yes giving blood frequently will lower iron levels, but giving blood 2 or 3 times a year will not affect iron levels at all
Giving all the time for the sake of society, sure on one hand that's fine. But if you're lowering your hemoglobin and thinning your blood too much this is problematic. This can leave you fatigued...no surprise, you're not getting enough oxygen to your tissue. Also, look up anemia, which is low red blood cells.
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