Calories are extremely important when it comes to our diet, because our bodies use calories as a source of energy. This energy is used to carry out every process within the body, so without calories we would cease to function. Throughout evolution the body developed ways to store this energy, which historically was scare. This was an adaptation humans used for survival. Fortunately today calories aren’t scare in the diets of most people, however we are no presented with the opposite problem; we are consuming too many calories and are becoming overweight. Many people are now really concerned about their caloric intake because of the effect it has on their weight as a whole.