Keep your routine the same if you're enjoying it! The only thing I would caution is to pay more attention to how you're feeling than what the scale says. If you're just starting out a rigorous exercise program and you're staying on the lower side of 1400 calories going in, it might cause a little bit of shock to your body.
This has happened to me a couple times. I end up feeling incredibly lethargic and dragging in the morning, even if my energy level bounces back up by mid-morning. I am trying to up my protein intake and be a little bit more flexible about my overall calorie numbers (going up to 1500, for example).
Although I really want to drop as much weight as quickly as possible, I know that my end goal is to be as fit as possible so I'm trying to make sure that I am keeping a healthy balance.