The National Institute of Mental Health says that up to one-quarter of Americans have been diagnosed with a mental disorder.  And the CDC reports that while one in 10 Americans over age 12 use prescribed antidepressants, most don't see a therapist.  This is despite evidence that talk therapy can help.   A new study from the United Kingdom published in The Lancet shows that while up to two-thirds of people don’t respond fully to antidepressants, they are three times more likely to experience a reduction in their depression symptoms if talk therapy was added to their treatment regimen.