Exhibit 99.1




                                January 14, 1999




Darling International Inc.
251 O'Connor Ridge Road, Suite 300
Irving, Texas  75038

Attention:  Mr. Brad Phillips

          Re:  Credit   Agreement   dated  as  of  June  5,  1997  (the  "Credit
               Agreement"),  among Darling  International Inc. (the "Borrower"),
               the Banks party thereto (the "Banks"),  and BankBoston,  N.A., as
               Agent (the "Agent").  All capitalized  terms used herein,  unless
               otherwise  defined herein,  shall have the same meaning as in the
               Credit Agreement.

Ladies and Gentlemen:

     Subject to the  Borrower's  and each  Obligated  Party's  execution of this
letter (the "Amendment Letter"),  and effective as of the date hereof, the Agent
and  each of the  undersigned  Banks  agree to amend  that  certain  Forbearance
Agreement dated as of December 14, 1998, among the Borrower,  the Agent, and the
Banks (the "Forbearance Agreement") as follows:

     1.   In each  instance,  the date  "January 15, 1999" in Section 2.1 of the
          Forbearance Agreement is amended to mean "January 22, 1999"; and

     2.   In each  instance,  the date  "January 15, 1999" in Section 2.2 of the
          Forbearance Agreement is amended to mean "January 22, 1999".

          THIS AMENDMENT  LETTER EMBODIES THE FINAL,  ENTIRE AGREEMENT AMONG THE
PARTIES  HERETO AND  SUPERSEDES  ANY  AND  ALL  PRIOR  COMMITMENTS,  AGREEMENTS,
REPRESENTATIONS,  AND  UNDERSTANDINGS  WHETHER  WRITTEN OR ORAL  RELATING TO THE
SUBJECT  MATTER  HEREOF AND MAY NOT BE  CONTRADICTED  OR VARIED BY  EVIDENCE  OF
PRIOR,  CONTEMPORANEOUS,  OR SUBSEQUENT  ORAL  AGREEMENTS OR  DISCUSSIONS OF THE
PARTIES HERETO. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES. This
Amendment  Letter  shall be governed by and  construed  in  accordance  with the
internal  laws  of the  State  of  Texas  without  regard  to  conflicts  of law
principles.  This Amendment  Letter may be executed in one or more  counterparts
and on telecopy


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counterparts each of which shall be deemed an original but all of which together
shall constitute one and the same agreement.

                                           Very truly yours,

                                           BANKBOSTON, N.A.,
                                           as Agent and as a Bank



                                           By:        /s/
                                              ----------------------------------
                                                  Peter Haley, Vice President

Accepted and agreed to
as of January 15, 1999:

BORROWER:
- --------

DARLING INTERNATIONAL INC.
INTERNATIONAL PROCESSING CORPORATION
INTERNATIONAL TRANSPORTATION SERVICE, INC.
THE STANDARD TALLOW CORPORATION
DARLING RESTAURANT SERVICES INC.
ESTEEM PRODUCTS INC.


By:      /s/
   ---------------------------------------                                      
       Brad Phillips, Treasurer of each of
        the foregoing companies


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                                           BANKS:
                                           -----

                                           CO-AGENTS:
                                           ---------

                                           CREDIT LYONNAIS NEW YORK BRANCH


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------


                                           COMERICA BANK


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------


                                           WELLS FARGO BANK (TEXAS),
                                           NATIONAL ASSOCIATION


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------

                                           OTHER BANKS:
                                           -----------  

                                           HARRIS TRUST AND SAVINGS BANK


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------



                                       7





                                           THE FIRST NATIONAL BANK OF CHICAGO


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------


                                           HIBERNIA NATIONAL BANK


                                           By:        /s/
                                              --------------------------------- 
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------


                                           THE SUMITOMO BANK, LIMITED


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------



                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------


                                           SUNTRUST BANK, ATLANTA


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------



                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------

                                       8




                                           CREDIT AGRICOLE INDOSUEZ


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------


                                           THE FUJI BANK, LIMITED - NEW YORK
                                           BRANCH


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------


                                           THE BANK OF NOVA SCOTIA


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------


                                           BANK ONE, TEXAS, N.A.


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------


                                           NATIONSBANK, N.A. (successor in
                                           interest by merger to NationsBank of
                                           Texas, N.A.)


                                           By:        /s/
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------


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