Dr. Dave is in the gym with Erinn Egbert from Season 8 of The Biggest Loser. She reveals the secret to how she lost 115 lbs and was the only contestant to keep the weight off six years after the show. Also, Dr. Justin Garcia, Evolutionary Biologist and Sex Researcher at Indiana University, teaches us the Science of Hooking Up!
If you missed it: Season One Premiere-Episode 1! Also, Episode 2 is here!
