It has been discovered with a new study that, simple blood test could predict if a patient will develop Alzheimer's disease up to 16 years before symptoms begin.

Through measuring changes in the levels of a protein in the blood, called neurofilament light chain (NfL), researchers believe any rise in levels of the protein could be an early sign of the disease, in accordance with the study published Monday in the journal Nature Medicine.

NfL is a "marker in the blood which gives an indication of nerve cell loss in the brain," explained lead researcher Mathias Jucker, professor of cell biology of neurological diseases at the German Center for Neurodegenerative Diseases. ''The more neurofilament you have in the blood, the more brain damage you have," he said.

There is still no effective treatment for Alzheimer's, but Jucker thinks the new blood test will be "very important for clinical studies." He belief the test will allow researchers to monitor the effectiveness of new treatments prior to the time when people will start to experience the symptoms, by measuring how levels of the protein are affected.

"Alzheimer's disease starts at least a decade, maybe even 20 years, before we have any symptoms," said Jucker, who is also a board director at the Hertie Institute for Clinical Brain Research at the University of Tübingen.

Presently, their is no test doctors can use to conclusively ascertain whether someone will get Alzheimer's disease and there are a lot of unknowns about its cause. A commonly believed theory is that, the disease is driven by the production and deposition of beta-amyloid plaques between neurons in the brain.

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