Alzheimer's disease (AD) is a disease of the brain that is defined by memory loss and, subsequently, by difficulties in reasoning, planning, language, and perception. AD is a disease that progresses slowly and is characterized by its sluggish progression. Many researchers in the medical field are of the opinion that Alzheimer's disease is brought on by an increase in the creation of, or accumulation of, a certain protein (beta-amyloid protein) in the brain, which ultimately results in the death of nerve cells.
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