No business person would ever run a retail store without a cash register or accounting system. It's a definitive way to measure success. But when it comes to health, wellness and personal performance, we essentially determine success on blind faith, habit, anecdote, and hype .Almost everything we "know" about human health come from small, flawed studies. Experiments on "what works" to improve the human condition are extremely challenging. You can't hold humans in a test tube, jab them with treatments and milk them for data over months and years.