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Hydrate yourself. To prepare your body for the loss of blood, you need to drink plenty of water or fruit juice the night and morning before you donate. The leading cause of faintness and dizziness when you give blood is a drop in blood pressure or blood sugar.
People burn approximately 650 calories per donation of one pint of blood, according to the University of California, San Diego. A donor who regularly donates blood can lose a significant amount of weight, but it should not be thought of as a weight loss plan by any means.To donate blood the American Red Cross requires donors to weigh at least 110 pounds and maintain healthy iron levels in the body.hole blood donors can also donate platelets 72 hours after a whole blood donation, and vice versa. Blood donors must be 17 years old in most states, with some states lowering the limit to 16 years old with parental consent.