how does the body cells get energy from the food we eat?
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In all molecules, there is a type of chemical energy called "enthalpy", it is the energy stored in bonds.  Think of it this way, all particles want to be free and in motion, in complete disorder, thats the "entropic" nature of the universe.  So, it takes energy to make particles stick together (forming compounds and molecules).  This energy is stored in bonds, and when the bonds are broken, the energy is released.  Our cells have the ability to break these bonds, and utilize this energy.\n\nThink of it this way, glucose is C6H12O6.  Our cells can break down all of the bonds in glucose until we form a few CO2 and water molecules.  Thats how we get our energy.
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That is such a huge question, no wonder everyone avoided it... Ultimately all energy comes from metabolism and you can find out more about this in wikipedia but, be warned, there is a lot of information there.\n\nBut in a nutshell sugars and fats are proken down in the body to form ATP, and that drives all of the energy requiring reactions in your body.
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This is a very involved question you have asked if I answer it at an advanced level.  \nYou don抰 say what school you are in or what your present grade level is,\nso I will assume you are fairly young.\nThe first thing that happens to the food that we eat is that the digestive system \nphysically and chemically breaks it down into smaller and smaller particles until it \ncan be absorbed through the intestinal walls as individual molecules.  These molecules\n then enter the blood capillaries and are distributed throughout the body to be taken\nup by cells that need the \n(1) carbohydrate molecules for the energy , \n(2) amino acid molecules for building proteins, or \n(3) lipid molecules (fat) for building membranes, certain of the hormones, \nand other things, or just to store this concentrated form of potential energy \n(the fat molecules) for a rainy day.\nThose cells that start using the carbohydrate molecules for energy is where the bulk of \nthe heat is produced.  What happens first is that the carbohydrate has to be absorbed \nas glucose or another closely related monosaccharide molecule that the cell can change \nto glucose.  The glucose is then metabolized (broken down) to carbon dioxide and water \nthrough a large number of chemical steps that builds ATP molecules (the energy storage \n揷ellular bullets? that can be use for almost all the cell抯 needs for reactions that require\nenergy in an easily usable from.  Building the ATP and using the ATP is like you burning a \ntwig out in the yard (in a safe place, of course) to heat a small cup of soup.  The wood, \nas it burns, combines with oxygen and is changed into carbon dioxide and water, plus a \nlittle smoke which is a leftover product of incomplete burning of the wood.  Now the body \nis much more efficient than this and doesn抰 leave any smoke as it consumes the glucose \nand produces the ATP molecules.  Cells do produce heat while 揵urning?the glucose and \nwhile using the ATP just like the fire heating the soup.\nFor a more detailed description of these biochemical events you can go to any good \nbiochemistry textbook and it will give you the actual molecular reactions.  I have one such \nbook 揃iochemistry?3rd edition, by Lubert Stryer, published by W. H. Freeman and Company, \nNew York.  There are two reference in this book on heat production; page 421 at the bottom, \nand page 443-4.  The last section gives a fascinating description of how molecular 揵urning?\nproduces enough heat in the bumblebee抯 thorax to allow him to fly even when it is cold outside.\n\nNow I haven抰 even talked about the control of heat production, but the cells can burn \noxygen with glucose to produce the ATP and heat in some of their reactions or sometimes \nthe cells do not use oxygen while 揵urning?a different molecule to produce the heat.  \nBut whatever the metabolic pathways involved in producing heat, this activity is controlled \nby a hormone from the thyroid gland.  The term basal metabolic rate (BMR) is used to talk \nabout this level of activity and thyroxin, or really triiodothyronine, another thyroid hormone, \nis responsible for maintaining the appropriate level of metabolism that will keep your \ntemperature at approximately 37 degrees centigrade throughout your life when you are healthy.  \nYou can find a very good detailed explanation of this system in any endocrinology textbook.  \nI happen to like 揃asic and Clinical Endocrinology?5th edition, by Francis Greenspan and Gordon  \nStrewler, published by Appleton & Lange, Stamford, Connecticut.  Pages 214-215 deal with this \ntopic in their book.\nGo to your local library and take a look around for these types of books and you will have many \nhours of enjoyable reading.
652557
Food, carbs are a big part of the energy that our body needs.
12732
Metabolism is basically a measure of the body's ability to use oxygen to burn up fuel abtained from food.  Thhe body has a survival mechanism to compensate for too little or too much food over a significant period of time.  For example, a person can fast for a day drinking only water or longer under medical supervision.  During that time, the body conserves fuel (fat) by lowering its metabolic rate.  After about a month of fasting, the body may suffer starvation where body tissue including heart muscle begin to be used up as fuel.  That can be very dangerous and depends on initial body weight.
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Eating more calories than your body needs results in fat. A calorie is energy and when the body has to much energy or calories than they are stored as fat.\n\nCarbs are the easiest thing for your body to use to create fat stores.Carbs are almost pure energy for the body and the energy from carbs is normally immediatly stored if not used.\n Rarley will you gain fat from protein sources since protein is used to repair damaged tissue. Only if an excessive amount of protein is eatin will that happen.\nFats themselves are not bad and dont always go towards the fat stores in the body. The body needs all kinds of fats to perform all finds of bodily functions.\n\nAnother way is when the body gets to few calories and lowers the metabolism to accommidate this. If this persists than the starvation response is activated and the body will store all the food it can as fat in order to prepare itself for lower and lower amounts of calories.
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MOUTH -  The teeth break food into smaller bits, which are  formed into a soft ball, called a bolus, by the tongue. Saliva lubricates the food and begins chemical digestion.\n \nPHARYNX -, or throat The pharynx pushes the bolus into the   esophagus.\n  \nOESOPHAGUS - The bolus is moved through the 10-inch esophagus by a series of coordinated, wave-like contractions. At the end of the short journey, the opening to the stomach relaxes and opens until the bolus of food passes, then closes again to prevent stomach contents from backing up. \n \n STOMACH - The stomach muscles pummel food and churn it with gastric juices containing enzymes and hydrochloric acid, killing potentially harmful bacteria and microorganisms and continuing the breakdown of food into smaller and smaller pieces. The resulting material is now called chyme. Four hours (longer if a meal includes fatty foods)\n \nSMALL INTESTINE -The duodenum (the first section of the small intestine) adds bile and pancreatic juice to the chyme, which helps the intestines digest and absorb nutrients from the food. Most digestion and absorption take place in the small intestine. Food first spends four hours in the duodenum, then two hours in the rest of the small intestine \n\nLARGE INTESTINE - Sodium and other salts, and most importantly water, are absorbed here. Leftover waste material is slowly pushed through the colon by muscular contractions until it reaches the rectum. Stool is ultimately eliminated from the body during a bowel movement from the rectum.  \n\n\nHOW LONG BOLUS IS DERE ( TIME)\n\nMOUTH- MINUTES OR LESS\n\nPHARYNX- SECONDS\n\nOESOPHAGUS- One to six seconds for liquids  \n            30 to 60 seconds for solids\n\nSTOMACH- Four hours (longer if a meal includes fatty foods)\n\nSMALL INTESTINE-Food first spends four hours in the  \nduodenum, then two hours in the rest of the small intestine\n\nLARGE INTESTINE-14 HRS
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If you're human, you do.  The food you eat is broken down to make the energy you need to live.  The energy is measured in calories.
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TRUE\nFirst of all all living cells do not produce energy from glucose only,but also from fats and proteins(during starvation).\nAnd then,most of the energy released is lost as heat energy.The remaining energy is stored as ATP( which is like a 'battery').Just as a battery can be 'plugged on' to different objects to produce light(torch),sound(tape recorder),etc so also the ATP can also be used as and when required to provide energy for locomotion,to produce light(glow worm),electricity(ray fish) etc.
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Plants store food as starch, sugar, glucose, and sometimes protien (as in pulses). And that is what we eat as fruits etc.
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When muscles contract they use energy that is derived from food. It is a two-step process. The first step occurs in mitochondria, where the energy from molecules like glucose or fats is locked away in ATP (adenosine triphosphate). This ATP travels from the mitochondria to sites in the muscle where energy is needed, and the energy is released and used. At both of these stages there is the possibility for energy to be lost mainly as heat, causing a big reduction in efficiency. The proportion of food energy that ends up making the muscles move varies considerably between people from 15 to 30%.
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DO NOT FAST!!!!!!! Our bodies need food to work properly. That is why we get hungry. Every organ of our bodies need the nutrients in the foods we eat. If you fast your body starts to eat itself. Look at the people in Etheopia. They HAVE to fast because they don't get food. Yeah they're skinny, but do they look healthy? They look withdrawn, sick, sad. When you eat a healthy balanced diet, you feel good, you look good, your skin glows, you're less likely to get sick, you boost your immune system, your organs and brain functions at top notch. When you starve....it's exactly the opposite. If you laid in bed all day and did nothing....your body burns about 1100 calories just to survive. This includes thinking, breathing, heart beating. If you fast...where is your body gonna get that energy? Not all from fat! It will be muscle.
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its when you food is diagested and the way it goes in your body.
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the food you eat has a large variety of chemical features, so you need a lot of different enzymes to break down all the different types of chemical structures that your food contains so your body can effectively process it.
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You don't. Enzymes break down food particles so that cells can use them for energy.
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Livings things have energy only because they aquire it from food. Using this energy they live, survive and do various tasks. When they die, what ever metabolic energy is left is used by the bacteria which decompose the body.
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Animals get their energy from sugars.  Sugars originate in plants who obtain their energy from sun light.