Going back to the original studies and working through them, if you have the time, is obviously a good idea, particularly if you are qualified in such an area. I suspect most people are going to go to an intermediary, a commercial enterprise that quotes the research in their recommendations.
Tim Ferriss? He may have good ideas, but I fear he weakens his arguments with his marketing. If he wants to be taken seriously I reckon he has to tone that side of things down.
I guess I will be more critical of "official" advice as a result of this thread. FWIW I think in the past if its led me off the best line its been in not encouraging enough of a reduction in carbs (the emphasis being strongly on reducing fat consumption), although recently they have improved on this.