Two stars instead of one, because it was so amazingly bad I just couldn't stop reading.
Reader's digest version:
"I'm Tim Ferris. Last week I tracked the weather for five days and noticed that it rained on the four days when I didn't carry an umbrella. But on the day when I did bring an umbrella, it stayed dry out. So obviously, carrying an umbrella prevents rain.
Now, some scientists may scoff and say that this flies in the face of known science and conventional wisdom, or that at least they'd need more data in order to be convinced. But I have no problem writing a whole book insisting to readers, through a stream-of-consciousness narrative told in OCD-level detail, that my umbrella-carrying behavior is what controls my weather.
Of course, if you want to really track the weather around you, you'll have to be willing to pay hundreds of dollars a week on expensive and time-consuming diagnostic tests to keep tracking your weather in minute detail, so that you can adjust your umbrella-carrying behavior in case the weather starts getting out of hand.
Also, I, Tim Ferris, am constantly having sex with models and partying with rockstars, as my 8 billion Twitter followers can avow. The book will continually remind you, just so you don't forget this even for a second.
In the introduction I'll tell you to be skeptical, to cover my ass; but I'll fill the rest of the book with overenthusiastic claims and dismissal of skepticism."
He does have a few decent tips, especially in the interviews with professional athletic trainers who actually get many people to do a program over time and see their results. I do admire the focus on doing the minimal workout to get results, rather than overdoing it unnecessarily.
(...although every chapter's advice contradicts itself: Work your muscles to failure every time. No, lift lighter weights for just a few reps, and workout right before eating every meal. No, eat breakfast as soon as you get up, before working out, and make sure it's all protein. No, avoid too much protein and have a glass of grapefruit juice with breakfast. No, avoid all fruits like the plague... I guess that's why the introduction tells you to read one segment at a time, not the whole book from start to finish. Oops.)
And I agree that obsessively-recorded self-experimentation might lead to changed habits that are right *for you*, individually. But the anecdote ("a few times I've had great sex after eating some almonds") does not translate into the general recommendation ("according to my in-depth research, guys should always eat almonds a few hours before sex"). I was not surprised to see a chapter here by Seth Roberts, who specializes in exaggerating the power & generality of claims he makes based on his own self-experimentation. They may be true claims for him, and they may be worth trying by others -- but he claims that if something works on him, that's enough evidence to trumpet it as reliable advice for everyone else, and I have no patience for that.
I'm also not convinced by his tracking of nutrient levels through tests that are both ridiculously expensive and unreliable from reading to reading.
I'm most impressed that Ferriss put two chapters about identifying quack medicine right before the description of his own bullshit "study." Oh, your diet program has a 100% success rate? But the participants were self-selected volunteers from your rabid Twitter followers, not a random sample of the population. And you dropped the people who didn't complete the diet -- you don't know how many tried it and failed without bothering to report their failure on your survey. And the 200 reports were those who "responded to all questions" -- so it sounds like you dropped out the failures who skipped a question or two. And you break it up by subgroups that would be too small to compare even if the study design *were* statistically sound.
The diet may happen to be perfectly good, but the report here simply provides no evidence, whether in favor or against.
Dear Mr Ferriss, you do a far better job with the inspirational writing in the closing thoughts:
"Most of us have resigned ourselves to a partial completeness... The beauty is, almost all of it can be changed... Your body is almost always within your control... take an inventory of all the things in the physical realm that you've resigned yourself to being poor at. Now ask: if I couldn't fail, what would I want to be exceptional at?"
Lovely. Stick to that, please.
PS -- the author's bio says he is "a tango world record holder." I'm not sure what about tango you can measure and hold records in... but if that's your approach to a dance of emotional connection, then dude, you're doing it wrong.