Yes, it's the altruistic component that has the long lasting value, however you are excising around 200mg of cells and proteins every time you donate - albumin,

Yes, it's the altruistic component that has the long lasting value, however you are excising around 200mg of cells and proteins every time you donate - albumin, other blood proteins and of course cells. So in the long run I think about it as losing weight as well ;) not to mention the energetic anabolic endeavours your body must go through to rebuild all those macromolecules !