Hi Louise, loosing the extra weight you are carrying will have an affect on your insulin resistance and may well see you off medication but make no mistake you will still be diabetic and if you dont watch your diet your numbers will go up and if you put the weight back on your insulin resistance will increase to its current levels again.
Kate is right your diabetes will be waiting in the wings ready to return.
Which is why I always say lifestyle not diet, sadly diabetes is for life.