TD, does the transfused blood nourish the body in any manner at all within any definition of the word nourishment ?
To my knowledge, there is only one scenario. When a person is starving to death the body will begin breaking down its own proteins, including albumin in the blood. This results in the distended abdomens and swollen joints we've probably all seen in pictures.
There was a time when albumin transfusions were given to starvation victims in an attempt to bring them back from the brink and get them to the point where they could handle solid food again. This was done in post-war Japan for example.
This is not done today, because there are better, more efficacious preparations available.
In a further touch of irony, this procedure would not be forbidden to JW's, because albumin is not considered a, "primary component" of blood.