I started giving blood several years ago while I was on a diet. I figured a pint is a pound the world round. So each pint I gave was one less pound I had to carry around.
It's difficult to find my veins in my chubby arms. Sometimes they have no problems, sometimes they can't find it and the "expert" is called in to find it, the "expert" never ever has a problem finding the vein. Then one day, the first lady can't find the vein and turns my arm into hamburger trying multiple times, then they call in the "expert" and she proceeds to turn my other arm into hamburger. That was the last time I gave blood.
Recently, I considered giving blood again, because they were testing your blood for Covid19 antibodies for free...But since my recent knee replacement surgery, I have to wait a while longer before I am eligible.