Dementia is the loss of intellectual ability, which is also known as cognitive (thinking) function, that interferes with daily activities. 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 November 19, 2008, issue of JAMA includes a study finding that the herbal product Ginkgo biloba did not decrease the development of dementia in either normal elderly persons or those with mild cognitive impairment. This Patient Page is based on one previously published in the June 6, 2007, issue of JAMA.