I have always been very hardcore about my aversion to blood and have never even considered the possibility that this was merely a dietary restriction. I always bought into the analogy of a doctor telling a patient to abstain from alcohol... it wouldn't matter whether this individual drank the alcohol or took it intravenously... it would all be in direct contradiction to the doctor's orders to 'abstain' from alcohol.
Or the other analogy is to an apple pie... if you weren't to eat the pie, it would not be okay to separate it out into the main parts (or 'components)... ie. the flour, the apples, the sugar or the cinnamon... if they were taken from that pie, you were eating the pie.
So maybe you can see where the questions popped up for me. The whole blood fractions issue has me very confused. I read a comment about Jesus curing someone on the Sabbath and how he was more concerned for than person's well-being than observing the Sabbath. (Of course, he abolished the old law, so it could be said that was why he was comfortable doing that).