Living Better While Living
We are living longer today than ever. The average life expectancy for an American recently hit a record high of 78.8 years; other countries are seeing similar increases in longevity.
This is great news, but it also means we are living in increased fear of the decline that often accompanies old age. For most people, that fear is sharpest on the subject of mental decline.
The fear is understandable, especially since the possibility is not as remote as most of us would wish. Alzheimer's disease, the most common cause of irreversible dementia in people 65 and older, affects an estimated 5 million Americans. The Alzheimer's Association predicts that the number could triple by 2050. (1)
But several new drug therapies have offered hope that there may be treatments on the way that can halt or even reverse Alzheimer's disease. The biotechnology company Biogen made headlines recently with the announcement that its newest experimental drug performed better than expected in early studies. The medicine showed a statistically significant effect in slowing cognitive decline and reducing amyloid plaque, protein deposits in the brain that are thought to be one of the disease's major causes. Tau protein, another factor which researchers at the Mayo Clinic recently suggested may be even more critical, is the target for several medications in development by Biogen and other companies. (2)
These recent drugs are not the only signs of progress. A few years ago, a biomedical engineer and neuroscientist at the University of Southern California in Los Angeles demonstrated some success with experiments in the use of neural prostheses - silicon chips designed to mimic a neuron's ability to process brain signals. The idea is to eventually restore the ability to create new memories in those who have lost it due to degeneration or trauma. Some Alzheimer's researchers are also shifting the focus of their research to the ApoE protein, which serves an unknown function in the brain but is strongly tied to the risk of early-onset Alzheimer's. Gene therapy may also offer great promise in combatting the disease. While a cure for, or even a full understanding of, Alzheimer's has not yet arrived, these developments offer strong hope that it's a matter of when, not if, it will.
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