Giving blood will make people weak.
Most adults have 10 to 12 pints of blood in their bodies. You'll feel little or no effect after donating one pint.
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During menstrual period, one can't donate blood.
Vegetarian can't donate blood because they don't have enough iron in it.
Blood taken is used for scientific research, and not just for patients
Mixed Race Group can't donate blood
Too much of my blood will be taken