Yum - my favourite subject !
If you're aiming for low carb then avoid sauces as they generally contain sugar, rice, breads, go for grilled meats/fish, salads, you'll do very well at an Indian restaurant on low carb options.
What sort of diet do you follow? What type of diabetes do you have?
Try to checkout for salads without dressings and virgin mojitos in menu.This is interesting for me- a group of friends are planning to go to an Indian restaurant and I was invited- I looked at the menu and couldn't identify anything I felt I could eat.