This chat with Dr. Jeff was a conversational smorgasbord of health, medicine and human optimisation. The good Doc and I spoke about hormesis (where exposure to a low dose of a potentially harmful stressor triggers a beneficial adaptive response), the truth about biological age, melatonin, hormone replacement therapy (for men and women), heat shock proteins, senescent zombie cells and we even get Dr. Jeff's thoughts on the ramifications (good and bad) of the new US Government (the Doc lives in Nevada). Enjoy.