Why Seeing Blood Makes People Faint

Why do some people faint at the sight of blood, while others barely flinch? Dr. Sanjay Gupta explains the surprising science behind blood phobia. Plus, what you need to know about artificial sweeteners. Producer: Jesse Remedios Showrunner: Amanda Sealy Medical Writer: Andrea Kane Senior Producer: Dan Bloom Technical Director: Dan Dzula Executive Producer: Steve Lickteig Learn more about your ad choices. Visit podcastchoices.com/adchoices