In 2013, an estimated million adults in the united states had alzheimer disease.

In 2013, an estimated 5.7 million adults in the United States had alzheimer disease.

Explanation:

Alzheimer's disease is the most common cause of dementia and causes destruction of gray brain tissue and atrophy of the brain. The disease also damages the chemical systems of the brain. Alzheimer's disease, like most other dementing diseases, occurs primarily in the elderly.

The disease was named after the German psychiatrist Alois Alzheimer, who first described the disease in 1906.   Alzheimer's disease destroys a person's memory and eventually other mental abilities, as well as physical and speech abilities.

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