Compared to controls, the rats also showed increased sensitivity to stress and produced more of a stress hormone, in a study published in May in a PublicLibraryofScience journal, PLoS One.
The study, published in 2009 in oneof the journals of the PublicLibraryofScience, PLoS Computational Biology, also showed that patients who developed diseases that tend to coincide with many others were more likely to die sooner than people whose diseases were more tangentially connected.