Instapundit pulls a one-liner off from this intriguing post on medical rejuvenation. There are some caveats, but good ones.
As for me, my first thought is that you can’t separate the cardio from the vascular system as they are too intertwined to be separated. If you just did the vascular portion, think of it as replacing all the plumbing in a system that had a high-pressure pump that had dropped in pressure because of the various plumbing issues. Fix the plumbing and don’t replace the valves and seals, and find most of the pump back up to pressure and what is going to happen? That’s not a bad analogy, so with that caveat I would go for a new cardio-vascular system first thing.
Second, you are talking systems here and the first choice made in the original post opens that door—so I plan to walk through it and claim the interrelated endocrine system as a similar exemption and go for that. There is some medical theory that says that the endocrine system acts as if it has a lifetime limit on its various elixers. Use up your ration of any given part early, and… The drop off, elimination, or decline of the various components is tied to many problems of aging and a number of nasty conditions can and do arise. For that reason, I would go for a regeneration of that system in a heartbeat.
My third would be predicated on a quick check of lungs and other major organs, but if all was good my choice for the third part would be either my eyes or my immune system. The eyes don’t get better with age, and if I could go back to 20/20 without any astigmatism, it would open so many doors back up to me. No problems with flight physicals, no scrambling for my glasses first thing upon awaking, far easier photography and videography, better marksmanship, and a whole array of better ballistic eye protection options. The immune system isn’t bad, but I wish I had better and the article makes some good points. Not sure which of the two I would pick, though I am leaning towards the eyes.
What would you choose?
LW



