Imposing limitations through discipline can help you to focus on what is important. Excessive limitation is self destructive. You, your body, or anyone else will rebel against too much discipline.
Discipline itself is a function of how we relate with externals. It is mainly a means of developing awareness of the self. Accomplishing this develops an inner truth that we can rely on. Inner truth will manifest in your relationships and impact your environment more than any forced constraints. See Yogi Bhajan’s quote for today.