Does the 4-hour Body Still Apply After 40?
Tim Ferriss says the basic principles in The 4-Hour Body still apply after 40 and after 50. He would rescind or revise very little of the book, and he still uses the Slow Carb Diet himself. A reboot on that diet is one of his top picks.
His default is a hybrid of the Slow Carb Diet and intermittent fasting: at least 16 hours of fasting, then an eight-hour eating window, sometimes shorter. On most days he fasts until 1, 2, or 3 p.m., then eats until dinner is finished. The clock stops when eating finishes, not when dinner starts. Over four to six weeks, in his case, an oral glucose tolerance test and insulin sensitivity change dramatically, and his tests were a world apart. He is becoming fat-adapted and keto-adapted through the fasting, and he uses the Slow Carb Diet the rest of the time.
He wrote the book in 2008 and 2009. It was published in 2010. He was using an early Dexcom continuous glucose monitor and thinks he was one of the first people without type 1 diabetes to use that device. Used on and off, a ketogenic approach helps him stabilize energy. For metabolic psychiatry he points to his interview with Chris Palmer of Harvard. A search for how to lose a hundred pounds on the Slow Carb Diet brings up a free blog post he mentioned.
