While your portfolio may appear to be wrapped up tightly in a well-diversified safety net, there may be a hidden risk lurking within. In the video below, Motley Fool analyst Blake Bos uses the recent health scare in China at Yum! Brand's (YUM -0.12%) KFC and McDonald's (MCD -0.29%) to expose this hidden risk for investors. Even such companies as Starbucks (SBUX 0.28%) aren't safe, but if you plan accordingly, you can minimize the impact of this unsystematic risk on your portfolio.