La Mesa, with a population of nearly 60,000, sits on a series of hills just east of San Diego. Its scenic character masks health statistics that are the worst in San Diego County, with 40 percent of the adult population overweight and an additional 23 percent considered obese. The area also has the highest rates of adult diabetes and heart disease. But now the city has written a strategic wellness plan that engages schools, health providers, businesses and faith communities in an ongoing effort to create the healthiest city in the region.