Fish,
All blood is metabolized by the body in due time. Its a "cyclical" liquid organ. I don't want to interject too much here, and let TD speak on his own, but think of this logically. You cannot put a rib smoothie or meal replacement shake into an IV. If a person is catatonic, they receive a "feeding tube". Just like if you are low on blood, you can't guzzle a pint and be all good. Besides turning your poop black, you will end up dying because your organs are not getting the necessary nutrients. the circulatory and digestive systems are two different systems.
Abstain has no qualifier. So if you viewed it on a scale, you would maybe on one hand say anything goes, blood sausage, eating bowls of blood, being a member of the Masai......then on the other side you would have not thinking about blood, not brushing your teeth too hard, etc... Both of those seem like extremes wouldn't you agree? What do you think the middle might look or feel like?