An curved arrow pointing right. Tim Ferriss, author of "The 4-Hour Workweek" and "Tribe of Mentors," is a firm believer in ketogenic diets and fasting. Here's why he believes so firmly in it.

Tim Ferriss, the author of "The 4-Hour Workweek" and "Tribe of Mentors," says the best mentors won't give you all the answers, but will give you the ability to find them yourself. Following is a ...

Not only has his weekly podcast, The Tim Ferriss Show, now reached 80 million downloads, but the self-help guru drives sales of books, teas, sardines, toothpaste and any other product or tool he ...