well...
you take the statement as it is la.

the doctor meant medication to help make the level lower sooner la.
but like everything else, for sure lifestyle change and diet will help la.

not like you eat medicine then continue with your current path.
so if you want see immediate result, medicine + lifestyle/diet change for long term.

if you just want lifestyle/diet change, dunno how drastic you will take it and how long its gonna take you. in that case, will you be okay until you get it done?