Dementia produces significant dependency and contributes to costly long-term care; depression contributes to high rates of suicide; and both contribute to lower quality of life and higher disability among older patients. Therefore, researchers are eager to find new ways of preventing and treating these conditions. Studies currently underway include evaluating the role of health specialists in treating depressed patients, looking at bereavement and its effects on patients, and the role of estrogen, vitamin E, NSAIDs and COX-2 inhibitors in preventing and treating Alzheimer's disease.