Finding one’s body mass index (BMI) is as simple as typing in height and weight measurements into a BMI calculator. Those easy results, though, can sometimes be misleading, which is why the widespread use of BMI is troubling, according to a doctor at the Mayo Clinic. Dr. Francisco Lopez-Jimenez joins us on "Take Care" this week. He's division chair of preventive cardiology at the Mayo Clinic. Lopez-Jimenez said the concept of having a standard definition of obesity is relatively new in medicine,