So how can I tell if I'm healthy?
Thanks to technology (sometimes it's good, technology), there are better ways to calculate your overall health -- though it's also smart to see a doctor.
Dr. Davidson says that more accurate measurements that calculate body fat (as opposed to weight), and whether or not you need to lose weight, including such Googlable wonders as underwater/hydrostatic weighing, bioelectrical impedance, DXA, MRIs, and the BODPOD. Still, each of these has its drawbacks, as some come with a hefty price tag and others only focus on fat.
"Every biomarker of health status improves with improving physical fitness and none of them improve with change in body weight alone," Dr. Davidson adds. "Again, BMI is often used to describe a population and identify relationships in a population, but should never be used to try to predict anything for an individual."