Therefore, a resolution such as, 'I want to lose weight this year' will probably fail. It is too vague. What would your ideal weight be, less what do you weigh now, is what you are going after. Set a deadline. Resolutions that are to be achieved 'as soon as possible' wind up in the heap of 'Someday I'll'.
Deadlines are commitments.
Without a deadline as a self-imposed pressure point, getting started is easily postponed. You see, deadlines put us on the line and define when failure occurs. Deadlines also help us to break the resolution down into little bite-sized pieces. Now that's manageable. 500 calories a day is easy to achieve.