The first thing that came to mind when you said healthy Indian food to me is lentil dhal. It's super flavorsome and lentils are so great for you - very healthy. I've also had delicious Indian curries that were chickpea and spinach based, and left me feeling satisfied but not heavy like some curries do. I think anything that is less oil/ghee heavy is good...veggie dishes are always going to be helpful too. And depending on how it's prepared, tandoori chicken is another thing to me that can be healthy!
Lots of options with plenty of flavor which is good - nothing is worse than trying to eat healthy and feeling like you're eating cardboard because it's bland!