An estimated 21.5 million additional adults in the United States may now be eligible for statins under updated cholesterol treatment guidelines, according to a new study. What prompted this major expansion, and does being eligible mean that someone should begin taking medication? We asked CNN wellness expert Dr. Leana Wen what patients should discuss with their healthcare providers. 📸: Scott Olson/Getty Images; Sean Anthony Eddy/E+/Getty Images #health #statins