Jellyfish Age Backwards is a survey about the various state of our understanding about longevity and methods about preventing aging. It probably doesn't descibe anything you don't already know: eat less, eat more vegetables, exercise more, and supplements may have side effects that are actually deleterious to your health.
One thing that I did learn is that it might be a good thing to give blood on a frequent basis. That drains iron from your body and apparently excess iron is a bad thing. It turns out that like everything else, the human body was designed to withstand minor injury and build back better, so this counter-intuitive action helps more than it hurts.
By and large, progress in various drugs, etc to improve lifespan have not panned out and has not worked. Progress is slow despite huge amounts of money being put into it. This book is a reminder of how hard won even those meagre gains are. Treasure your health while you have it, because history suggests once you lose it we don't really know how to get it back.
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