Negative caloric intake
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Eating the same amount of food and losing weight is possible. Not drastic amounts of weight, mind you, but weight nonetheless. It is called negative caloric intake, and there are several different ways to achieve it.
The first of the aforementioned ways is to take in foods that have less calories within them than it takes to perform one's normal activities of daily living. A prime example of this is celery: in eating celery, one's body expends more energy than the food actually provides, assuming that you chew your food to at least some degree and do not swallow it whole. There are other foods like this, though maybe not to the same degree, that you can eat and burn off completely in performing normal day-to-day activities. Some foods you one consume and then burn off simply by walking into the other room, while other foods may require just a bit more physical exertion to rid oneself of them entirely, such as bathing or showering.
Another excellent way to eat the same amount of food as one typically would and still manage to lose weight is by a process known as "calorie leakage", a term coined by the leading nutritional expert Dr. Marie Gachuh, who attended the University of Maryland. "Calorie leakage" is a process in which food is broken into smaller pieces and/or converted into a finer substance, such as crumbs, powder, or even paste. "By breaking your food into smaller, more bite-sized pieces, you can reduce the total number of calories found in that particular portion of that food," says Dr. Gachuh. "In breaking the food into smaller bits, or smashing or grinding it up to make it closer to a liquid state, atomic bonds within the food are weakened or even broken. Energy is expended in the process, and that is exactly what calories measure: energy. So by expending energy in the process of crushing or breaking food up, calories are lost. Also, due to the weakened or broken bonds now present in the food, your body can much more easily metabolize and rid itself of the food taken in. Most people either do not know of this technique or choose not to use it because they would prefer to eat their food in larger, more solid pieces, as opposed to much smaller, crumb-like pieces, or eating something that is powdery or pasty in consistency."
These are just a few of the ways one can achieve a negative caloric intake. Further information on negative caloric intake can be found in nutritional books at the library or bookstore, or possibly within health magazines or online articles.