Only 31.8 percent of adults living in the Pittsburgh region reported being a healthy weight in 2016, according to data from the Centers for Disease Control and Prevention’s Behavioral Risk Factor Surveillance System. A healthy weight is defined as having a body mass index (BMI) between 18.5 and 25. However, that percentage is the highest among Pittsburgh TODAY’s benchmark regions. Obesity is a different story. About 35 percent of adults in the Pittsburgh region were obese in 2016 – right at the benchmark average. Obesity is defined as having a BMI of 30 or higher.