4.0

A lot of the science in the beginning is probably worth a re-read. I found it hard to follow the author's thoughts, and I think he got way too excited about some claims. And I heard that some of the stuff he is suggesting (like fasting) is not actually as great as suggested. I was comparing this book with Outlive by Peter Attia, which I found more approachable and actionable. Lifespan talks more about ideas for medicine and makes exercise, sleep, and mental health sound like secondary things. Which is not the case as of now.
But!
They might be less important one day! One day, we might actually be able to just swallow a pill or something similar against aging. Which, I guess, is the message this book wanted to get across with all that dubious science. Even if not all of those approaches succeed, some will. And they will likely increase our lifespan by a lot, if not by an infinite amount.
And that is why this book is actually interesting. All the discussions in the end that were about potential causes on the societal level and what that might mean for humanity. It made me think. And made me sign up to a longevity conference in SF lol. Let's learn more!