Stressed-out workers
spend $1,500 more on health care each year. Pets, yoga and sleep can change that
"What we found ... was that if we actually invest in people, they got better and health-care cost went down," Bertolini, the former Aetna CEO and author of "Mission-Driven Leadership: My Journey as a Radical Capitalist," said at CNBC's Evolve event in New York City.