The inability to detect Alzheimer’s early is one main reason pharmaceutical companies have not been able to develop a drug to combat the disease, which is the most common form of dementia. That’s why it’s great news that researchers have just developed a simple blood test that shows evidence of brain damage due to Alzheimer’s almost seven years before any kind of cognitive change occurs. Theoretically, this test could be used to find patients who will go on to develop the disease, so that in the near future they could be enrolled in drug trials, and in the long term, could be saved from developing dementia.