Scientifically, a calorie is the measurement of the energy content of food. In more practical terms, calories are used as a unit to indicate how much energy a person eats, and how much of that energy is then used. In the United States, most if not all food products and beverages have to list the amount of calories in their product, usually on the package. This information can be very useful, and in many cases necessary, when attempting to lose weight.
The amount of calories a person needs depends on many factors, including the present weight, activity level and genetically inherited metabolism. The average woman needs around 2000 calories a day, and about 2300 when she is pregnant. The average man needs from 2500 to 3000 calories daily.
The relation between calories and weight loss is purely mathematical. If a person needs 2200 calories a day and consumes less, he or she will lose weight. The same goes the opposite way; if a person exceeds the amount of calories needed, he or she will gain weight. If the person exercises, some of the calories that are consumed will be burned, resulting in a lower daily average.
Therefore, the time-tested formula for weight loss has been and will remain the same at the core of all attempts to lose weight, no matter what diet or program is tried. If a person eats low-calorie foods, like fruits and vegetables, they can eat more and feel full while cutting their daily calorie intake. If they exercise, this will also result in lower daily calories. If less calories are consumed than a person needs, the body will break down fat to get energy and the result will be weight loss.
