In general we measure the metabolic process in calories. To keep the body functioning takes from 1,200 to 3,000 calories per day - an average of 1,800. Strenuous activity naturally requires more calories. Some football players burn from 4,000 to 5,000 calories per day, while inactive people may use a few as 800.
Proteins, carbohydrates, and fats are the body's "fuels" and the only foods that contain calories. Your body burns calories you ingest to perform whatever work is necessary to keep your body going and to perform whatever work necessary to keep your body going and to power your muscles so you can make, even if it is only moving a finger, uses calories, and the automatic functions of the body also require fuel (see table below).
Scientists have learned that it takes 3,500 calories to equal a pound of fat. There are 9 calories per gram of fat and 4 calories per gram of both carbohydrates and proteins. But there are important differences between calories that you need to understand, and once you do understand you will see why high protein, fats with low carb diets are popular today.
A calorie may be a calorie, but not all calories have the same beneficial effect in the body. A raw apple, for instance, contains roughly 75 calories. Bake it, and it still basically has 75 calories, but the vitamins, minerals, and enzymes have been destroyed by the heat. On the other hand, if you eat the apple raw, your body must warm it to digest it, a process that in itself requires about 7 calories. So when you consider your caloric intake, you must think about gross calories versus net calories. Raw foods are better because the body uses calories just to process them. Cooked foods are rapidly digested and easily assimilated with no energy requirements, so you wind up with more net calories. A salad, which contains a high percentage of cellulose, requires a lot of calories for the body to digest it, giving you fewer net calories and making salads excellent foods for weight control.
If your body burns all the calories you ingest in a day, no excess calories will be stored. But if you consume more calories than you burn, the body will store these as fat. If you burn an average of 2,000 calories per day, for instance, but are eating 3,000, the extra 1,000 will be stored by your body as fat. In a week that amounts to 7,000 extra calories - approximately 2 pounds. In a nutshell, that's how you gain weight.
If you do not eat sufficient food to provide the calories you need for the activities you expect to engage in, however, ultimately the body will cease to function properly, just as a car that runs out of fuel.
2007-02-24 05:53:16
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answer #1
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answered by Mathlady 6
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2007-02-24 13:57:27
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answer #2
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answered by Anonymous
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2007-02-24 13:56:44
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answer #3
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answered by raj k 3
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