I think there is more to blood than we know.
Apparently, patients who have received large blood transfusions have sometimes undergone large personality changes.
Same with receivers of organ donations, esp. the heart.
They have sometimes taken on attributes / preferences of the donor.
Fascinating to research:
https://www.dovepress.com/perceived-changes-in-behavior-and-values-after-a-red-blood-cell-transf-peer-reviewed-fulltext-article-IJCTM