By most measures, Kelly Bliss, 50, surely seems to have let herself go. The Lansdowne, Pa., resident stands 5 ft. 2 in. in her stockings but tips the scales at nearly 200 lbs. Run those numbers through the body mass index (BMI)--the statistical measure that factors height and weight to diagnose obesity--and Bliss scores higher than 35. Anything above 25 is overweight; anything above 30 is obese. In the nation's ongoing war with obesity-related health problems, Bliss is one more casualty, right?
Maybe not. In fact, we should all be as unhealthy as Kelly Bliss. Her blood pressure is often as...