I know I cannot donate blood or tissue due to the postings I had in Europe in the 80's. In addition to what happened in the 70's.
Fortunately, I can talk about liver failure! I had an adverse reaction to one of my allergy meds (IRONY MUCH). The reaction cause a partial shutdown of my liver. I was on the verge of total failure when the doc changed my diet RADICALLY:
1 to shield me from my allergens
2 to reduce the strain on my liver.
The benefit, after just 8 months I have had a 14" reduction in my waist, and yes a fully regenerated liver. There is the hope my brother, the liver is one of the few organs that does regenerate.