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Food energy is the amount of energy available from food that is available through respiration. Like other forms of energy, food energy is expressed in calories or joules. Some countries use the food calorie, which is equal to 1 kilocalorie (kcal), or 1,000 calories. In the context of nutrition, and especially food labeling, the calories are large calories approximately equal to 4.1868 kilojoules (kJ). The kilojoule is the unit officially recommended by the World Health Organization and other international organizations. In some countries only the kilojoule is normally used on food packaging, but the calorie is still the most common unit in many countries. Fiber, fats, proteins, organic acids, polyols, and ethanol all release energy during respiration - this is often called, unhelpfully, 'food energy'. It is only when the food (providing fuel) reacts with oxygen in the cells of living things that energy is released. A small amount of energy is available through anaerobic respiration. All foods are made up of a combination of these six caloric nutrients and non-caloric nutrients. Non-caloric food includes (but not limited to) water, vitamins, minerals, antioxidants, caffeine, spices and natural flavors. Tea and coffee also cannot be respired to release calories without sugar or milk added. Nutritionists usually talk about the number of calories in a gram of a nutrient, but this implies that the food actually 'contains' energy. Better to say that each gram of food (fuel)is associated with a particular amount of energy (released when the food is respired) . Fats and ethanol have the greatest amount of food energy per gram, 9 and 7 kcal/g (38 and 30 kJ/g), respectively. Proteins and most carbohydrates have about 4 kcal/g (17 kJ/g). Carbohydrates that are not easily absorbed, such as fiber or lactose in lactose-intolerant individuals, contribute less food energy. Polyols (including sugar alcohols) and organic acids have fewer than 4 kcal/g. Each food item has a specific metabolizable energy intake (MEI). Normally this value is obtained by multiplying the total amount of energy associated with a food item by 85%, which is the typical amount of energy actually obtained by a human after respiration has been completed. From Wikipedia under the
GNU Free Documentation License how does a strangler gig get food, energy and oxygen? Q. I have to do a project for school and I have to figure out how a strangler fig gets its food, energy, and oxygen. I also was wondering how does it reproduce? Asked by oksana - Sun Sep 6 19:41:20 2009 - - 2 Answers - 0 Comments A. The fig is like any other plant- leaves, roots... It just used other trees as support. Since it doesn't have to build a strong core to hold itself erect it can grow faster. It strangles the host tree so it dies and opens up sunlight for the fig. Seeds I imagine. Animals eat the fruit and spread the seeds where ever they go. Answered by thor - Mon Sep 7 11:16:20 2009 Describe what happens to the chemical energy in food that is not converted to useful cellular work.? Q. Describe what happens to the chemical energy in food that is not converted to useful cellular work. Please give me as long as answer you can. Asked by kayla - Mon May 19 09:00:34 2008 - - 2 Answers - 0 Comments A. In the case of fats it may be stored in places so it can be used as a store of energy. In the case of proteins it is excreted from the body as amino acids can be toxic to the body in certain cases. but usually whenever something is not useful in the body it is excreted. In cases such as haemochromatosis large amount of iron are stored in the body even though they are not needed and can even make your skin turn bronze and damage your kidneys Answered by matthewclarke47 - Mon May 19 09:10:07 2008 What is a high energy food and or drink?
Q. I need help, Christmas coming and my energy is low, on vitamins and taking omega's Asked by j - Fri Dec 12 17:49:58 2008 - - 2 Answers - 0 Comments A. Any food will give you energy. Some suggestions: Bananas, pineapples and strawberries. Vegetables like cabbage and spinach. Dairy food. Red meat is high in energy. Wheat and barley products are also good energy food. Pasta. Energy drinks: Fruit juices Milk Tea/coffee Soft drinks. Answered by Peace - Fri Dec 12 18:31:05 2008 From Yahoo Answer Search: "Food energy" See also:
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