Think i did a long post on this, recently... Possibly on nosher's thread, but i can't be sure, i am afraid. Maybe a Search would find it for you. Basically, avoid carbs, sweet sauces, and the drier the curry, the safer it is likely to be.
Yes there is a long thread somewhere. Don't know where! However, when ever we have an Indian, I just have either the chicken tikka or tandoori chicken and salad, with a smidgen of curry sauce over the salad. Do you know? I might just order one!!!!!!! Had a homemade chicken tikka for myself that the wife cooks from the sauce available at any good stockists! Prefer pattak's for taste and consistency. Believe @Brunneria makes a similar recipe from scratch! Whilst shopping I nearly picked up a ready made makanwhala to try! Glad I didn't, more than a lot of carbs in it!