MFS VARIABLE INSURANCE TRUST
497, 1999-01-14
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                         MFS(R) VARIABLE INSURANCE TRUST
                          MFS(R) Emerging Growth Series

                      Supplement to the Current Prospectus


The  description  of  portfolio  managers  under the  "Management  of the Fund -
Investment Adviser" section is hereby restated as follows:


         Emerging  Growth  Series - John W.  Ballen,  President of MFS, has been
         employed  by the  Adviser as a portfolio  manager  since 1984.  Toni Y.
         Shimura, a Vice President of MFS, has been employed by the Adviser as a
         portfolio manager since 1987. Ms. Shimura became a portfolio manager of
         the Series on November 30, 1995.  Stephen  Pesek,  a Vice  President of
         MFS, has been employed by the Adviser as a portfolio manager since 1994
         and has been a portfolio  manager of the Series since January 15, 1999.
         From 1987 to 1994,  Mr.  Pesek  worked at  Fidelity  Investments  as an
         analyst.


                The date of this Supplement is January 15, 1999.


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                         MFS(R) VARIABLE INSURANCE TRUST
                           MFS(R) Total Return Series

                      Supplement to the Current Prospectus


The  description  of  portfolio  managers  under the  "Management  of the Fund -
Investment Adviser" section is hereby restated as follows:

         Total Return Series - David M. Calabro, a Senior Vice President of MFS,
         has been employed by the Adviser as a portfolio manager since 1992. Mr.
         Calabro is the head of this portfolio  management team and a manager of
         the common stock portion of the Series' portfolio. Mr. Calabro has been
         a  portfolio  manager of the Series  since July 19,  1995.  Geoffrey L.
         Kurinsky,  a Senior Vice  President  of MFS,  has been  employed by the
         Adviser as a  portfolio  manager  since  1987 and has been a  portfolio
         manager of the Series since July 19, 1995. Mr.  Kurinsky is the manager
         of the Series' fixed income  securities.  Constantinos G. Mokas, a Vice
         President  of MFS,  has been a  portfolio  manager of the Series  since
         April 1, 1998,  and has been  employed  by the  Adviser as a  portfolio
         manager since 1990. Mr. Mokas is the manager of the Series' convertible
         securities.  Lisa B. Nurme,  a Senior Vice  President  of MFS, has been
         employed by the Adviser as a portfolio manager since 1987. Ms. Nurme is
         a manager of the common stock portion of the Series'  portfolio and has
         been a portfolio  manager of the Series since July 19,  1995.  Maura A.
         Shaughnessy,  a Senior Vice  President of MFS, has been employed by the
         Adviser as a  portfolio  manager  since  1991 and has been a  portfolio
         manager of the Series since July 19, 1995. Ms. Shaughnessy is a manager
         of the  common  stock  portion  of the  Series'  portfolio.  Kenneth J.
         Enright, a Vice President of MFS, has been employed by the Adviser as a
         portfolio  manager  since 1986 and has been a portfolio  manager of the
         Series since January 15, 1999.  Mr.  Enright is a manager of the common
         stock portion of the Series' portfolio.



                The date of this Supplement is January 15, 1999.


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