A medical system that successfully guided patients toward healthier lifestyles would almost certainly see its cash flow diminish dramatically. “Last year, 75 percent of the $2.6 trillion the U.S. spent on health care was for treating chronic diseases that, to a large degree, can be prevented or reversed through lifestyle change,” says Dean Ornish of UCSF. Who (besides patients) has an incentive to make changes that would remove that money from the system?