Ha - that's a good one.
We need to look at from God's statements to us Humans. Jehovah could have chosen the Ear to be holy and to abstain from people's ears. Or eyeballs. Well - we know that's ridiculous. BUT - Jehovah views our life in a particular way. Blood is what keeps one alive. That is the internal tissue we cannot change. What we take in externally (Food, Air...) keeps the LIFE in us (Blood) working to keep us alive.
So if I tear your ear off - you still can live. Chop off a leg or arm - you can still live. BUT - Remove the Blood we do not live!
For ancient ones of God who were like big children - who tossed stones at people for their temper / anger. They HAD to learn LIFE = Sacred. So - to teach us this, Blood must be considered Sacred in all cases.
(Genesis 9:4) . . .Only flesh with its life—its blood—you must not eat.
No would one die if they ate blood? No. But it's the principle of Life we need to learn.
Your blood is Your Life. I can't touch your blood. I must respect your blood. Is donating blood risky? Very rarely, but could cause Anemia, which could lead to passing out, perhaps falling and harming one self. BUT - that's a long shot.
(Leviticus 17:14) . . .For the life of every sort of flesh is its blood, because the life is in it. Consequently, I said to the Israelites: “You must not eat the blood of any sort of flesh because the life of every sort of flesh is its blood.. . .
This law would help followers to Respect Life! Thus why even Kind David didn't drink the water (2 Sam. 23) - amazing his response:
(2 Samuel 23:17) . . .Should I drink the blood of the men going at the risk of their lives?. . .
It wasn't Blood - but it was the point They Risked Their Lives! He needed to make a statement. If he did drink - it would have moved others to risk their lives.
Great Question