Timothy Taylor summarizes:
Their report estimates costs for five most common chronic diseases: cancer, diabetes, heart disease, hypertension, and stroke. One set of costs are treatment costs; a much bigger cost is the reduction in GDP when people are unable to work to their usual productivity, or at all. Of course, the measure here underestimates the full social cost because it does not seek to place a monetary value on the costs of death and suffering.
Source: Milken Institute report.