Food additives are ubiquitous in packaged foods, and they have been blamed for many health problems despite the lack of evidence one way or another.  It's easy to imagine patient groups or physicians noticing that their particular disease of interest is on the rise, whether asthma or breast cancer, and desperately searching for a cause.  Food additives entered the market in the second half of the twentieth century, so they provide a prime suspect for diseases that have worsened during that time....