Alzheimer's can be detected years before symptoms show

In a US study it has been found that about two decades before the first symptoms are shown, the earliest signs of Alzheimer's appear.

For avoiding any damage to thinking and memory, it is vital to treat the disease in time.

There were certain differences in the brains of the people who are to develop an early form of Alzheimer's, the study stated.

When it comes to treating people, it may give more time to doctors, experts said.

The study said, "Alzheimer's disease starts long before anyone would notice; previous studies have shown an effect on the brain 10-15 years before symptoms."

The signs of dementia start appearing only after enough brain cells have died. Before the disease is actually seen, about 20 per cent of the brain cells are lost.

There is a fear among doctors that due to degeneration of brain by the time dementia signs show up, it is difficult to treat patients.

"The failure of recent trials to prevent further cognitive decline in patients with mild to moderate Alzheimer's disease has been partly put down to timing," the study stated.