We trust the guidance of medical professionals so much – and it can be hard for both doctor and patient when new research recommends changing course on well-established treatments. Dr. Marty Makary is a Johns Hopkins professor and member of the National Academy of Medicine. He joins guest host Courtney Collins to discuss why physicians have recommended we avoid everything from hormone replacement therapy to eggs and why it’s so hard to correct flaws in previous studies. His book is “Blind Spots: When Medicine Gets It Wrong, and What It Means for Our Health.”