In recent years, many studies have been carried out to measure whether the presence of some substances could indicate neurological problems. A new study by Lund University that focuses on neurofilament light protein (NFL), detectable by a blood test. The high concentration of NFL can be connected to the loss of nerve cells and to Alzheimer.
If you are interested in learning and getting more information, you can consult the articles by Science Daily and JAMA Neurology.