Geography counts for a lot. The percentage of people who receive a new dementia diagnosis every year varies hugely across the different parts of the US. This comes even after taking into account common risk factors like high blood pressure, high cholesterol, tobacco and alcohol use, and various socio-economic differences. Neighborhood stress factors have also been linked to an increased risk of developing aggressive prostate cancer. In the present case, however, compared to the national average, researchers found that people living in certain regions of the US are 28% less likely to be diagnos…