By Federico D'Anna and Stefan Larsen
Unless you're close to retirement, you've probably never heard of SilverSneakers or its provider Tivity Health (TVTY), which lost 32% of its market cap in just one day with the announcement that it was going to acquire weight management firm Nutrisystem (NTRI). The acquisition decision of Tivity CEO, Donato Tramuto, has so far nullified years of enlightened management, during which the CEO turned a company, once capital intensive and unprofitable, into a Mecca for shareholders. This acquisition destroyed almost $1 billion worth of value despite