Counting calories is an effective weight loss tool, notes Mayo Clinic, and counting carbohydrates is also an effective tool, notes an article on Shape. Counting calories is considered to be the conventional method for weight loss, states Fit Day. It is important for people who are trying to lose weight choose one method or the other, because the food components of a low-carb diet are different from those in a low-calorie diet.
A person trying to lose weight must eat 3,500 calories fewer than they expend to lose 1 pound, says Mayo Clinic. This means that a person who wants to lose 1 pound a week would need to eat 500 fewer calories per day than they expend. If the person wants to lose 2 pounds per week, 1,000 fewer calories must be eaten daily than expended.