Alzheimer's disease is the most terrible ending of memory problems. And with age, memory begins to fail many. And this is not an accident, and not indicators of age. These are the indices of brain efficiency. The more active the brain, the longer his work and the more clearly a person's memory. Alzheimer's disease begins almost imperceptibly, a person forgets where he put the key to the house. And at the extreme stage of the disease a person does not remember himself, does not recognize his family. From this disease there is no medicine, but there is a reliable way to prevent the disease. And this is reading books. American researcher Robert Wilson with a group of scientists for 6 years, observed a group of nearly three hundred people of senile age (an average of about 89 years). And after the death of the subjects, their brains were examined for pathological changes. It turned out that people who read more than average during their lifetime were 32% less affected by memory problems, while people who did not read at all lost 48% of memory faster than those who devote an average amount of time to this activity . Fortunately, not everyone who forgets where he put the keys is at risk of Alzheimer's disease. But is it worth it to experiment on your health.