By eating 1,000 calories per day you could lose up to 2 pounds per week.
You should also do exercise as well since you'll lose the weight faster be more healthier because of the exercise.
Try jogging, running or even just walking around your neighborhood. Walking is both good exercise for losing weight plus good for preventing diabetes and heart disease.
The more active you are the more healthy you'll be and you increase your chance of living a longer and healthier life.