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Donating blood is unhealthy for my body as everyone has a limited amount of blood...
That is UNTRUE!
However, that is a MISCONCEPTION!
An average adult has ~12 pints of blood in the human body.
In fact, each time you donate blood, only 1 pint (~473ml) of blood is drawn.
Blood Bag Containing 1 Pint of Blood
In the human body, red blood cells are constantly renewed by the bone marrow after 120 days.
Donating just 1 pint of blood out of 12 CONSTANTLY RENEWABLE pints of blood will make a NEGLIGIBLE DIFFERENCE to your body!
This means that the formation of blood is a CONSTANT PROCESS.