One of the problems with the way we discuss health interventions is that we see them in black and white. Something is either good for you or bad for you. Things are rarely that simple, though. Moreover, there's "good for you" and "GOOD FOR YOU". How do you tell the difference? Watch and learn. Almost all of the data for this came from the amazing website TheNNT (http://thennt.com). You can go there to see those and more. Additionally, Aaron's new book is out! Please consider buying a copy. He'd really appreciate it! http://dontputthatinthere.com/#buy_the_book John Green -- Executive Producer Stan Muller -- Director, Producer Aaron Carroll -- Writer Mark Olsen -- Graphics http://www.twitter.com/aaronecarroll http://www.twitter.com/crashcoursestan http://www.twitter.com/realjohngreen http://www.twitter.com/olsenvideo