Study shows daily walks lower risk of cognitive decline Fox News senior medical analyst Dr. Marc Siegel joins 'America's Newsroom' to react and discuss why liver cancer cases are projected to double by 2050. NEW You can now listen to Fox News articles! Aging is often depicted as a steady decline, but new research suggests that many older adults actually improve over time. Using more than a decade of data from a large, representative study of older Americans , Yale University researchers found