(Undated)  --  In a survey that seeks to find the fattest cities in America, Portland is ranked next-to-last.  Analysts with finance-and-lifestyle website WalletHub.com compared 100 of the most populated U.S. metro areas across 17 key indicators of weight-related issues.  The Portland metro is number 99, trailing only Seattle as the "leanest."  Jackson, Mississippi ranks as the fattest city in the U.S.