Eighty-three critically ill patients were randomly allocated to receive either the standard calculated daily caloric requirement of 25-30 kcal kg ( -1 ) d ( -1 ) ( eucaloric ) or 50 % of that value ( hypocaloric ) via enteral tube feeds or parenteral nutrition , with an equal protein allocation in each group ( 1.5 g kg ( -1 ) d ( -1 ) ) .