People have been fasting for thousands of years for religious and health reasons, some regard it as a weight loss tool. You’ve probably seen headlines about celebrities drinking exotic fruit juices to prepare for movie roles, and heard friends talking about their weekly fast days.

©2015 Bloomberg News NZVO156KLVR4 (Bloomberg) — In 2015, the fracking outfits that dot America’s oil-rich plains threw everything they had at $50-a- barrel crude. To cope with the 50 percent price plunge, they laid off thousands of roughnecks, focused their rigs on the biggest gushers only and used cutting-edge technology