Weight loss goals should be SMART, that is they should be:
You would need to specify exactly what it is that you want to achieve. For example, maybe you want to lose 12 kilograms or lose just one centimeter from your waistline.
Make sure that your weight loss goals are measurable. For example you could use a scale to check if you have lost any weight and how much. This can be done every three weeks perhaps.
Weight loss goals should be set such that it is possible for them to be attained. For example, you cannot set a goal to lose 10 kilograms in just two days.
Be sure to set realistic goals otherwise it is pointless setting a goal in the first place. Your goal should not be impossible to achieve.
You would also need to set a time frame for which to achieve your goal, such as six months, eight months, etc. Sub goals may have different and smaller time frames.
Next time you set a weight loss goal for yourself, check to see that you have incorporated the above criteria in your planning, as it will help to ensure a positive outcome.