> You have biases and subjectivity when "measuring" yourself As do the nurse who draws your blood, the tech who tests it, and the doctor who interprets the re

> You have biases and subjectivity when "measuring" yourself As do the nurse who draws your blood, the tech who tests it, and the doctor who interprets the results. By all means recruit them to assist in your study, but don't do it in blind faith. > that makes your own "measurements" of yourself unreliable Perhaps in some ways and for some metrics, but conversely you are the best at knowing where you experience pain, how you "feel," and how today differs from yesterday. > you cannot even do something so simple as estimating the effect on life expectancy :) Well, no more than anyone else can :)