... three parts, the ego (the rational, cognitive part), the id (the irrational, emotional part), and the superego 2 THE GRAVITY OF WEIGHTas a disease has many advantages and benefits, including garnering ... side of the energy balance equation, and it is important to consider. Less than 50% of the American population exercises on a regular basis, clearly a factor in the development of obesity but also ... the brain, of course, and not a separate anatomical struc-ture. We have ideas about what parts of the brain contribute to our notion of mind, but we have yet to identify exactly what we mean by...