The problem with this is that a small dose of blood, even as much as a shot glass, is not going to contain significant amounts of any micronutrient (vitamins, minerals) in which your body might be deficient. In terms of macronutrients (protein, carbodhydrates, fat) the amounts are still going to be pretty low compared with say, a sandwhich or a glass of milk and either of the latter is most certainly easier for the human digestive system to cope with. On the other hand, drinking relatively large amounts of blood will make you feel very unwell indeed. There is no plausible physical condition in which a human being would physically need to drink blood or where it would be even close to as good a solution as eating a good meal, even if it were any solution at all. There are, as I have suggested, physiological conditions which have an associated perceived need to drink blood but even in those cases, blood drinking is only a perceived solution not an effective actual solution.
Perhaps it is not a nutrient issue, as blood contains much more than nutrients. Not everything we consume orally is primarily for nutrients, for example drugs of any kind. To also connect it to the other thing about looking into it as a fetish, I consume blood for relief rather than pleasure. It's not a high more than it is a return to normal. Perhaps that is where the idea of OCD came from mentioned by DeVega, their rituals are done out of fear rather than enjoyment and they would like to stop.
Perhaps it is not a nutrient issue, as blood contains much more than nutrients. Not everything we consume orally is primarily for nutrients, for example drugs of any kind. To also connect it to the other thing about looking into it as a fetish, I consume blood for relief rather than pleasure. It's not a high more than it is a return to normal. Perhaps that is where the idea of OCD came from mentioned by DeVega, their rituals are done out of fear rather than enjoyment and they would like to stop.