You make the assumption that people will use the scientific method with this stuff. The more likely scenario is that people will optimize for a single number (V

You make the assumption that people will use the scientific method with this stuff. The more likely scenario is that people will optimize for a single number (VDL/HDL, weight, or other) and miss the whole point. The attitude that we can simply "optimize our life" is reductionist, arrogant, foolhardy. You will spend more time optimizing your numbers than you will living your life. But hey, at least you have the data to back it up :-)