As the year draws to a close, we at HuffPost Healthy Living are taking time to reflect on all the new understandings about our health that we've gained this year.
And, of course, we can't forget the biggest health stories that have emerged this year -- a potential cure for leukemia, a mysterious SARS-related virus cropping up in the Middle East, and perhaps the most influential event of the year: the Supreme Court's upholding of the Affordable Care Act.
We rounded up 12 of what we think were the biggest health news stories from 2012. Did we leave any off the list? Tell us in the comments!