One of the leading cults in our world today contend that it is a sin to receive a blood transfusion to even save a life in a hospital. Scripture have been given. Such use of blood was common among the Gentiles. They drank it often in their sacrificial feasts and in making covenants. Thus this rules out blood pudding.
Rare steaks have most of the blood removed prior to eating.
Animals strangled and which have not been properly bled when butchered should not be used for food likewise. Now, it takes a wild stretch of one's imagination to conclude from the stated Scriptures that one is to avoid receiving a blood transfusion in order to restore life or to even save a life. Some today are fearful of contacting a virus or disease from donated blood from a blood bank. Therefore, they have the privilege of donating their own blood in preparation for a surgery, if it is needed. What a wonderful day in which we live when blood transfusions, and organ transplants are available to assist us medically.