New Year, New You?

It seems every year at this time we see a variety of articles in print and online with the headline "New Year, New You." Having seen this catchy phrase most recently on the cover of Costco Connection - right above a slightly photoshopped picture of one of America's original fitness gurus Jack LaLanne - just got me wondering, what does it mean? If I run to Costco to pick up Jack LaLanne's Power Juice Machine, will my life suddenly change in 2008?