Dementia is the loss of intellectual ability, which is also known as cognitive (thinking) function. Persons with dementia may be confused, not be able to remember things, or lose skills they once had, including performing normal daily activities. Eventually, they may not recognize family members or friends and may display agitated behavior. Although dementia is more common in older adults, it is not a normal consequence of aging. The August 12, 2009, issue of JAMA includes an article about dietary patterns, cognitive decline, and risk of dementia. This Patient Page is based on one previously published in the June 6, 2007, issue of JAMA.