At the start of nearly every doctor's visit, chances are you will be asked to step on a scale and get your weight measured for that day's exam record—and you would be hard-pressed to find a person whose physician has not brought up his or her weight at some point. But many conversations around weight have become a hindrance, not a help, in the campaign to make people healthier. Doctors' recommendations to drop pounds are still extremely common, even though using body size as a one-size-fits-all proxy for health can obscure the complexity of an individual's particular physiology.