Heart rate information sits on the face of a Samsung Gear S2 smartwatch at the Samsung Electronics Co. exhibition stand during previews for the IFA International Consumer Electronics Show in Berlin, Germany (Photographer: Krisztian Bocsi/Bloomberg)  

Silicon Valley Wants To Cash In On Fasting

(Bloomberg) -- Like most of the health fads that catch on in Silicon Valley, this one broke through thanks to word-of-mouth—and a Medium post. Entrepreneur Sumaya Kazi extolled its virtues to 650,0...

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