It is not possible to answer this question without knowledge of your age and sports activities.
The number of calories the body consumes in a day is different for every person. You may notice on the nutritional labels of the foods you buy that the "percent daily values" are based on a 2,000 calorie diet -- 2,000 calories is a rough average of what people eat in a day. But your body might need more or less than 2,000. Height, weight, gender, age and activity level all affect your caloric needs.
It is really heathy to buy and eat low fat foods but not with 0 % fat. Fat is inevitable for our health.