This week, our nation takes an important step toward becoming healthier. This is the week uninsured Americans can start shopping for health insurance under the Affordable Care Act.

American Heart Association CEO Nancy Brown, and her guest — Bernard J. Tyson, the CEO of Kaiser Permanente and a member of the AHA’s Board of Directors — discuss what it means in her latest Huffington Post column.

For more in this series of heart-health columns on the Huffington Post, visit Nancy Brown columns.