60- Moises Velasquez-Manoff - Old Friends

http://www.moisesvm.com

In the past 150 years, improved sanitation, water treatment, and the advent of vaccines and antibiotics have saved countless lives, nearly eradicating diseases that had plagued humanity for millennia. But now, a growing body of evidence suggests that the very steps we took to combat infections also eliminated organisms that kept our bodies in balance.

Listen... and Also, read this: 

http://www.motherjones.com/environment/2013/04/gut-microbiome-bacteria-weight-loss