Organ Transplants Seem To Change A Person's Entire Personality And Scientists Don't Know Why
Briefly

Changes in personality post-transplant can occur due to psychological, placebo, and biological factors. Cells of transplanted organs can release hormones affecting the body beyond their main function.
The heart, especially, releases hormones affecting fluid balance, electrolytes, and the fight-or-flight response. Biology, not just psychology, may play a role in post-transplant personality changes.
Read at Inverse
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