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All foods except vitamins and minerals contain stored energy. This energy is released and made available to living things during the chemical reactions of respiration.
Member rating: No Rating | Words: | Submitted: Tue Aug 26 2003
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Food Energy Background: All foods except vitamins and minerals contain stored energy. This energy is released and made available to living things during the chemical reactions of respiration. When food is burned it releases the same amount of energy in the form of heat, as it does when respired. The energy value of food is burned in a calorimeter. All the heat given off by the food is transferred to a known quantity of water, which rises in temperature. It takes 4.2 joules of heat to raise the temperature of 1g of water by 1oc. So the energy value of food is calculated by the formula; temperature rise x 4.2 x mass of water. A foods energy value is usually quoted in kilojoules: 1 kilojoule (1kj) = 1000 joules. These measurements give the potential rather than the actual energy value of a food. If you eat bread and butter, whose energy...
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