New data released this week from the Centers for Disease Control and Prevention (CDC) shows that since the Affordable Care Act went into effect in September 2010, the percentage of 18- to 25-year-olds who report being uninsured has significantly declined by four percentage points. Specifically, the provision in the legislation that allows most young adults to remain on their parents' health insurance plans until their 26th birthday has helped one million additional young adults to get health insurance compared to a year ago.