Lousy for diet (anag.) (2-2-8)
I believe the answer is:
do-it-yourself
(Other definitions for do-it-yourself that I've seen before include "Don't get the professionals in!" , "Heraldic device; directions" , "Amateur putting-up of shelves etc" , "Handyman's motto and practice" , "Repairs, etc without recourse to a tradesman" .)