The guy who wrote "The 4 hour work week" also wrote "The 4 hour body" and if you ever wanted one of these self-/body-optimization grifter books debunked, this is the podcast episode for you. It's also really funny.
https://maintenancephase.buzzsprout.com/1411126/episodes/19023703-tim-ferriss-s-the-4-hour-body-feat-peter-shamshiri