write.dta and export of variable labels

When I import a data file in stata format using read.dta, the full variable
labels (e.g. variable= "inc2000"; variable label= "Total household income in
year 2000"). When I then export the same data file using write.dta, the
variable labels are not included in the new .dta file. Is there any way to
ensure that the variable labels are maintained?

Thanks