Dementia is the loss of intellectual ability,
which is also known as cognitive (thinking) function.
Persons with dementia may be confused, not 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 September 22/29, 2004, issue of JAMA includes an article reporting that regular walking is associated
with a reduced risk of developing dementia and an article reporting that physical
activity is associated with slower cognitive decline.