The Affordable Care Act may be helping to slow down the ever-growing costs of health care, according to a new report. Still, the health care law has yet to entirely live up to its name. Employer-sponsored health insurance premiums grew more slowly in 31 states and the District of Columbia between 2010 and 2013 -- after the passage of Obamacare -- compared with 2003 to 2010, according to the nonpartisan foundation the Commonwealth Fund. The slowdown in the growth in premiums is tied to the recent historic slowdown in health care costs, Commonwealth Fund President David Blumenthal told reporters Wednesday, and could be attributed to a variety of factors.