http://healthaffairs.org/blog/2016/06/02/making-the-business-case-for-investing-in-community-health/

In recent years, many businesses have put a premium on improving employee health—often through investments in workplace wellness programs, onsite clinics, or the availability of fruit and vegetables on the premises.

Ostensibly, these programs are intended to generate a return on investment (ROI), with the thought that healthier employees are more productive employees, less likely to miss work, and more prepared to fulfill their potential. To date, though, research from the field has been mixed on whether workplace wellness programs and clinics deliver the ROI they promise.