Lilee84 648 Posted August 1, 2012 The short version is that it's when you deprive your body of carbs so that instead of burning carbs for energy your body is forced to start burning fat for energy. Here's the longer version http://lowcarbdiets.about.com/od/faq/f/whatisketosis.htm 1 Giselle3264 reacted to this Share this post Link to post Share on other sites