Researchers at Harvard Medical School in Boston now say that lithium could help treat the 7 million people with Alzheimer's disease.

Lithium is a metal found in some foods, drinking water, and in trace amounts in our bodies. It has long been used to treat some psychiatric disorders. But its potential role in protection against brain aging and Alzheimer’s disease opens up new doors for developing medicines that may finally provide an effective tool for fighting this dreaded brain-robbing disease,

Researchers at Harvard Medical School reported Wednesday that the depletion of lithium in the brain appears to play a significant role in the development of Alzheimer's disease. The findings, published Wednesday in the journal Nature,