Data-mining techniques often rely on an eclectic approach to data analysis. In the same way a stew is the result of many varied ingredients being mixed in the same pot, behavioral advertising is the result of many types of browsing behavior being mixed together in order to detect trends. As with ingredients in a stew, no single piece of data has an overly deterministic impact on the outcome, but each has some impact. Adding a visit to a weather site in the data stew will have an outcome on the offers a user receives, but not in a particularly nefarious way. However, once health information is added to the mix, it becomes inevitable it will have some impact on the outcome. As medical expenses leave many with less to spend on luxuries, these users may be segregated into data silos