Managers of large corporations intuitively understand that having a healthier employee population can result in many benefits. Fewer sick days can help operations run more smoothly. Morale improvements can be substantial as well (for instance, in employees that would have had to cover for a stick employee, as well as the employee him/herself.). Of course, healthier employees result in lower costs, due both to decreased sick days as well as health insurance cost savings.
There are various barriers that enterprises face when trying to work the "employee health" problem. Cultural resistance to tackling the problem can be substantial - sometimes executives are uncomfortable with even approaching it, since health is perceived as such a personal issue.