How long does it take to replenish blood after it's been donated?

And how many calories do you lose by donating blood (just curious)?

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Recommanded Answer:
You don't lose anything in the long run. Blood volume takes about 24 hours to return to normality, red blood cells are usually one or two months. The only disadvantages are very temporary, slight light handedness, slightly bruised arm (not too bad if you put enough pressure on it when they take the needle out), that sort of thing. It's been known for people to faint but pretty rare. I donated at about 8pm and felt ever so slightly woozy afterward (and bear in mind I was right at the lowest weight allowed to donate) but by the next morning I felt absolutely normal.

• You don't lose calories by donating blood lol you just lose blood. And it should be normal again in a couple days
• Replacement of lost volume begins within minutes following donation, as the body recruits tissue fluid into the vasculature. Lost red cell mass is replaced by the bone marrow within 4-6 weeks.
• not sure the number of calories but it took me a good long time to replenish blood the last time i did it, i got really sick