There are many good reasons to avoid consuming blood in its many forms,
for both physical and spiritual health.
To start with spiritual reasons, there has been plenty published by Jehovah's Witnesses about the God's view as presented in the Bible about how he views blood and its use; not only in the Mosaic Law but also in the Christian Greek scriptures. The book of Acts of the Apostles mentions that we must abstain from blood, and in context it mentions that "good health" goes along with that. If that was issued as acommand, it must be something important, even if we don't know all the background info on the matter.
One thing is sure, over the past 100 years there have been remarkable advances in the knowledge of microorganisms, pathology, enzymes, body systems, and of course chemistry. Everyone has the ability to make an informed decision on the matter of blood use, and to avoid information because of tradition, personal desire, or stubborness can lead to lots of difficulty. Ignorance may be bliss... (as some say), but life may also be blissfully short for the foolish.
To think that the meat industry is a clean operation, is ignorant. At least whole meat can be washed and cooked fully easily. The meat glue department allows the meat industry to produce whole meat-looking products, allowing meat that has been exposed to bacteria to be effectively consolidated in the mix. Now it becomes obvious why ultimate freshness and through cooking becomes an absolute necessity. A necessity, which is impossible in the current system of things and requires the use of all sorts of dangerous chemicals; I mean preservatives.
The following link is to an article discussing the use of meat glue in processed meat foods. The glue is derived from animal blood fractions. When all those cows are slaughtered by the millions to provide us with steaks and pot roast, they are hung upside down and bled before being butchered. The blood is collected and processed in various ways, for use in many different industries and items. If you haven't been grossed out yet, congratulations. This will probably do it: You like red lipstick? You might not if you knew that many companies use blood as an ingredient in that beautiful rouge color. That's just one example from the cosmetic department.
The use of blood as discussed in the linked article is to create a strong "meat glue" to hold stuff together; think chicken nuggets, ham, salami, sausages, imitation crab meat, etc...
Since the food itself has been made with processed blood, it then is something Christians need to weigh in their conscience as to whether that is an acceptable food for them or not. It definitely is gross-out for me, I had no idea what held those things together until today, but I have wondered. I'll continue to add more links and information in this post that I feel is relevant to the subject as I continue my research.
Here are some links:
One cow- hundreds of uses- written in 2004
cow blood use- a scientific abstract- possibly for use in plywood industry