Metabolismenteenshttps://kidshealth.org/EN/images/headers/T-metabolismBB-enHD-AR1.jpgYour body gets the energy it needs from food through a process called metabolism. Get all the facts on metabolism in this article.weight, metabolic, overweight, body composition, body type, enzyme, converting food into energy, how the body uses food, how the body converts food, food as fuel, metabolizing food, anabolism, catabolism, metabolizum, metabalizm, metabolizem, metabalism, metabulism, metabulizum, endocrine, gland, thyroid, thiroyd, thieroyd, pancreas, pancreus, insulin, calorie, glucose, sugar, fat, thin12/13/200407/10/201909/02/2019Larissa Hirsch, MD07/01/2019d4eeeba5-5457-40c0-8915-fa1a8097c087https://kidshealth.org/ws/RadyChildrens/en/teens/metabolism.html/<h3>What Is Metabolism?</h3> <p>Metabolism (pronounced: meh-TAB-uh-liz-um) is the chemical reactions in the body's cells that change food into energy. Our bodies need this energy to do everything from moving to thinking to growing.</p> <p>Specific proteins in the body control the chemical reactions of metabolism. Thousands of metabolic reactions happen at the same time &mdash; all regulated by the body &mdash; to keep our cells healthy and working.</p> <h3>How Does Metabolism Work?</h3> <p>After we eat food, the <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/digestive-system.html/">digestive system</a> uses enzymes to:</p> <ul> <li>break proteins down into amino acids</li> <li>turn <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/fats.html/">fats</a> into fatty acids</li> <li>turn carbohydrates into simple sugars (for example, <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/glucose.html/">glucose</a>)</li> </ul> <p>The body can use sugar, amino acids, and fatty acids as energy sources when needed. These compounds are absorbed into the blood, which carries them to the cells.</p> <p>After they enter the cells, other enzymes act to speed up or regulate the chemical reactions involved with "metabolizing" these compounds. During these processes, the energy from these compounds can be released for use by the body or stored in body tissues, especially the liver, muscles, and body fat.</p> <p>Metabolism is a balancing act involving two kinds of activities that go on at the same time:</p> <ul> <li>building up body tissues and energy stores (called anabolism)</li> <li>breaking down body tissues and energy stores to get more fuel for body functions (called catabolism)</li> </ul> <p><strong>Anabolism</strong> (pronounced: uh-NAB-uh-liz-um), or constructive metabolism, is all about building and storing. It supports the growth of new cells, the maintenance of body tissues, and the storage of energy for future use. In anabolism, small molecules change into larger, more complex molecules of carbohydrates, protein, and fat.</p> <p><strong>Catabolism</strong> (pronounced: kuh-TAB-uh-liz-um), or destructive metabolism, is the process that produces the energy needed for all activity in the cells. Cells break down large molecules (mostly carbs and fats) to release energy. This provides fuel for anabolism, heats the body, and enables the muscles to contract and the body to move.</p> <p>As complex chemical units break down into more simple substances, the body releases the waste products through the skin, kidneys, lungs, and intestines.</p> <h3>What Controls Metabolism?</h3> <p>Several hormones of the <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/endocrine.html/">endocrine system</a> help control the rate and direction of metabolism. Thyroxine, a hormone made and released by the thyroid gland, plays a key role in determining how fast or slow the chemical reactions of metabolism go in a person's body.</p> <p>Another gland, the <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/pancreas.html/">pancreas</a>, secretes hormones that help determine whether the body's main metabolic activity at any one time are anabolic (pronounced: an-uh-BOL-ik) or catabolic (pronounced: kat-uh-BOL-ik). For example, more anabolic activity usually happens after you eat a meal. That's because eating increases the blood's level of <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/glucose.html/">glucose</a> &mdash; the body's most important fuel. The pancreas senses this increased glucose level and releases the hormone <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/insulin.html/">insulin</a>, which signals cells to increase their anabolic activities.</p> <p>Metabolism is a complicated chemical process. So it's not surprising that many people think of it in its simplest sense: as something that influences how easily our bodies gain or lose weight. That's where <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/fat-calories.html/">calories</a> come in. A calorie is a unit that measures how much energy a particular food provides to the body. A chocolate bar has more calories than an apple, so it provides the body with more energy &mdash; and sometimes that can be too much of a good thing. Just as a car stores gas in the gas tank until it is needed to fuel the engine, the body stores calories &mdash; primarily as fat. If you overfill a car's gas tank, it spills over onto the pavement. Likewise, if a person eats too many calories, they "spill over" in the form of excess body fat.</p> <p>The number of calories someone burns in a day is affected by how much that person <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/exercise-wise.html/">exercises</a>, the amount of fat and <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/bones-muscles-joints.html/">muscle</a> in his or her body, and the person's <strong>basal metabolic rate (BMR)</strong>. BMR is a measure of the rate at which a person's body "burns" energy, in the form of calories, while at rest.</p> <p>The BMR can play a role in a person's tendency to gain <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/weight-height.html/">weight</a>. For example, someone with a low BMR (who therefore burns fewer calories while at rest or sleeping) will tend to gain more pounds of body fat over time than a similar-sized person with an average BMR who eats the same amount of food and gets the same amount of exercise.</p> <p>BMR can be affected by a person's <a href="https://kidshealth.org/ws/RadyChildrens/en/teens/genes-genetic-disorders.html/">genes</a> and by some health problems. It's also influenced by body composition &mdash; people with more muscle and less fat generally have higher BMRs. But people can change their BMR in certain ways. For example, a person who exercises more not only burns more calories, but becomes more physically fit, which increases his or her BMR.</p>MetabolismoEl metabolismo es el conjunto de reacciones químicas que tienen lugar en las células del cuerpo para convertir los alimentos en energía. Nuestro cuerpo necesita esta energía para todo lo que hacemos, desde movernos hasta pensar o crecer. https://kidshealth.org/ws/RadyChildrens/es/teens/metabolism-esp.html/7ff96a97-986f-4ac6-a9fe-4d4520465a5d
Diabetes CenterOur Diabetes Center provides information and advice for teens about treating and living with diabetes.https://kidshealth.org/ws/RadyChildrens/en/teens/center/diabetes-center.html/2de408fd-c6ef-4ca3-a5cf-9a1456fe0f29
Endocrine SystemThe endocrine system influences almost every cell, organ, and function of our bodies. It is instrumental in regulating mood, growth and development, metabolism, and sexual function, among other things.https://kidshealth.org/ws/RadyChildrens/en/teens/endocrine.html/7572f55a-2090-4b77-b6d1-74740e26934d
Should I Gain Weight?People want to gain weight for all sorts of reasons like playing their favorite sports or keeping up with friends who are filling out. So what's the skinny on weight gain? Find out here.https://kidshealth.org/ws/RadyChildrens/en/teens/gain-weight.html/fe4912a3-90b2-426c-8855-17d4a28a66b8
Type 1 Diabetes: What Is It?Diabetes is a disease that affects how the body uses glucose, a sugar that is the body's main source of fuel. In type 1 diabetes, glucose can't get into the body's cells where it's needed.https://kidshealth.org/ws/RadyChildrens/en/teens/type1.html/af259e3d-ac7d-4b73-958c-795acbc7e5c3
Type 2 Diabetes: What Is It?Teens with type 2 diabetes have to pay close attention to what they eat and do.https://kidshealth.org/ws/RadyChildrens/en/teens/type2.html/879b38fb-42b6-4ebe-a3a2-e87557ad20f2
What's the Right Weight for My Height?One of the biggest questions guys and girls have is whether they're the right weight. Because the body is growing and changing so much during adolescence, it can be tough to answer this question.https://kidshealth.org/ws/RadyChildrens/en/teens/weight-height.html/a49c2e77-14c4-4d3d-b99b-e3f8b95e0382
When Being Overweight Is a Health ProblemA couple of pounds of extra body fat are not a health risk for most people. But when people are severely overweight, it can cause health problems.https://kidshealth.org/ws/RadyChildrens/en/teens/obesity.html/86e35f4d-c4b7-42bf-84a0-f23b54b1965a
Why Exercise Is WiseGetting the right amount of exercise can rev up your energy levels and even help you to feel better emotionally. Find out why.https://kidshealth.org/ws/RadyChildrens/en/teens/exercise-wise.html/1533a4c6-6d86-4e3d-9163-7797e214e101
kh:age-teenThirteenToNineteenkh:age-youngAdultEighteenPluskh:clinicalDesignation-endocrinologykh:clinicalDesignation-geneticskh:genre-articlekh:primaryClinicalDesignation-endocrinologyFood & Nutritionhttps://kidshealth.org/ws/RadyChildrens/en/teens/nutrition-fitness-center/nutrition/1a969d03-96c0-4b38-804d-98e75e3035deBody Basics for Teens: Cancerhttps://kidshealth.org/ws/RadyChildrens/en/teens/cancer-center/body-basics/25592b63-66c6-41c2-a10f-b37fb9000216Body Basics for Teens: Sports Medicinehttps://kidshealth.org/ws/RadyChildrens/en/teens/sports-center/body-basics/0d5f9161-8da9-481c-898e-c0b8e24ae5e3Body Basics for Teens: Diabeteshttps://kidshealth.org/ws/RadyChildrens/en/teens/diabetes-center/body-basics/5a39046a-2605-47d8-a2f5-b12a881429dbBody Basics Libraryhttps://kidshealth.org/ws/RadyChildrens/en/teens/your-body/body-basics/b8bcb07a-02ec-4e7d-a125-cf86a24d95f0