It sounds like you’re referring to a “calories in vs. calories out” type of equation. First you need to understand that one pound of fat is made up of roughly 3,500 extra calories. So in order to lose one pound of fat, you need to create a caloric deficit of 3,500 calories.
Basically, you can create a deficit of calories in three different ways:
1. Eat fewer calories than you burn each day. Keep in mind that your body burns calories all day long as part of your basal metabolic rate (BMR), because it takes energy (calories) for your body to perform basic physiological functions that are necessary for life—breathing, digesting, circulating, thinking and more. On top of that, physical activity (bathing, walking, typing and exercising) uses even more calories each day.
It’s not important for you to know what your BMR is. Your SparkDiet has already estimated your BMR based on variables like age, gender and weight, so you don’t have to do any calculations. The calorie goal recommended in your SparkDiet plan will help you create a caloric deficit and lose weight.
Example: If you eat 500 fewer calories each day for a week, you’ll lose about one pound of fat (500 calories x 7 days = 3,500 calories). Again, keep in mind that your SparkDiet has already done these calculations for you, so simply follow the calorie recommendations on your plan (don’t eat less than is already recommended).

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