what is the relationship between energy and calories?
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Each gram of fat yields 9 calories. A calorie is a measurement, just like a teaspoon or an inch. Calories are the amount of energy released when your body breaks down (digests and absorbs) food. The more calories a food has, the more energy it can provide to your body.
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Each gram of fat supplies the body with about 9 calories, more than twice that supplied by proteins or carbohydrates. Because fats are such an efficient form of energy, the body stores any excess energy as fat.
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Calories Burned by Activity The amount of energy you consume when exercising is dependent upon your weight, height, and intensity of the workout.
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A calorie is simply a unit of energy, so the number of calories you burn during exercise is actually a measure of the energy required to move your body. Larger people require more energy to move their bodies, so you'll typically burn more calories at a heavier weight.
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Specifically, a calorie is the amount of energy, or heat, it takes to raise the temperature of 1 gram of water by 1 degree Celsius (1.8 degrees Fahrenheit). One calorie is equal to 4.184 joules, a common unit of energy used in the physical sciences.
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['A small calorie (cal) is the amount of energy required to raise the temperature of 1 gram (g) of water by 1º Celsius (º C).', 'A large calorie (kcal) is the amount of energy required to raise 1 kilogram (kg) of water by 1º C. It is also known as a kilocalorie.']
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Illustrated Glossary of Organic Chemistry - Kilocalorie (kcal; food calorie; large calorie) Kilocalorie (kcal): A energy unit equal to one thousand calories. When referring to the energy content of food, one calorie (also called a food calorie or a large calorie) is equal to one kilocalorie.
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The physical unit "calorie" is the energy required to increase the temperature of one gram of water by 1 degree Celsius, and the dietary Calorie is a kilocalorie = 1000 calories. ... It is common practice to just use the unit kcal to avoid the confusion between "calorie" and "Calorie" .
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Kilojoules (kJ), and calories (kcal), are both units that measure energy. Our program uses kcal to measure your energy intake and energy used. If you would prefer, you can convert kcals to kJs by multiplying by 4.18 (100 kcals = 418 kJ).
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"A calorie is a calorie is a calorie," they say — that it doesn't matter whether you eat a 100 calories of candy or broccoli, they will have the same effect on your weight. It's true that all calories have the same amount of energy. One dietary calorie contains 4,184 Joules of energy.
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Heat is the form of energy that is transferred between two substances at different temperatures. The direction of energy flow is from the substance of higher temperature to the substance of lower temperature. Heat is measured in units of energy, usually calories or joules.
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Scientifically, 1 kilocalorie (1000 calories or 1 kcal) means the energy it takes to raise the temperature of 1kg of water by 1°C.
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Sometimes the energy content of food is expressed in kilojoules (kj), a metric unit. One kcal equals 4.184 kj. So the Calorie on a food package is 1,000 times larger than the calorie used in chemistry and physics.
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The amount of energy in an item of food or drink is measured in calories. When we eat and drink more calories than we use up, our bodies store the excess as body fat. If this continues, over time we may put on weight. As a guide, an average man needs around 2,500kcal (10,500kJ) a day to maintain a healthy body weight.
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The physical unit "calorie" is the energy required to increase the temperature of one gram of water by 1 degree Celsius, and the dietary Calorie is a kilocalorie = 1000 calories.
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Calories aren't bad for you. Your body needs calories for energy. But eating too many calories — and not burning enough of them off through activity — can lead to weight gain. Most foods and drinks contain calories.
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Well, an empty calorie does actually supply energy, but it's not nutritionally balanced. If you're trying to maintain or lose weight, it's better to keep foods that contain empty calories to a minimum.