Discipline is great when people are up to it. Some people may try to tackle too much work and too much change in their lives, in their diets, all at once, too quickly, like trying to quit smoking cold turkey, like trying to turn from a couch potato into a business man or workaholic over night, and people need to examine how much change they can manage. That is why some people may need a life coach, a diet coach, somebody that can help them manage the change, the discipline, because it can be too much at times. Often times, it doesn't work for some people and they get sucked back into their old diets and habits. And in those cases, they may need help if they can't discipline themselves without extra help.