A nice steak meal may not fit into a traditional diet very well, but it may be appropriate to a low-carb Atkins-type diet -- as long as you limit the extras. For example, if you're shooting for low-carb, avoid that baked potato and bread in favor of a dinner salad.
Before ordering a steak meala t a particular restaurant, be sure that you understand their terminology for rare, medium rare, medium, well done, and the like, and be sure that it coincides with your own. That way, it's less likely your meal will be delayed while you send the steak back to be done right.