Food on display at a Miami supermarket. Advocacy groups say they're concerned that Americans are consuming foods with added flavors, preservatives and other ingredients that have never been reviewed by regulators for immediate dangers or long-term health effects.
Joe Raedle/Getty Images
Along with sperm, the in vitro procedure adds fresh mitochondria extracted from less mature cells in the same woman's ovaries. The hope is to revitalize older eggs with these extra "batteries." But the FDA still wants proof that the technique works and is safe.
Chris Nickels for NPR
Food and Drug Administration Commissioner Dr. Margaret Hamburg in a photo taken last May. Hamburg, who has been in the top FDA job for nearly six years, will reportedly step down.
J. David Ake/AP