Ramadan is, as a matter of fact, all about breaking habits. This is the real and inner meaning of fasting, because by breaking habits we deprive ourselves of certain indulgences, apart from the satisfaction of our physical needs, which have virtually become part of our nature.
Deen isn't culture. It's a filter for culture, which means Deen is a codification of fitra. It gives you access to fitra. It gives you a way of understanding what your intuitive sense of right and wrong is and what is appropriate in the moment.