Eating Disorders, Second Edition
By Pamela Keel and M. Foster Olive
()
About this ebook
Eating disorders are better understood and recognized now than in years past, but they remain a serious health risk for many people. Celebrity icons and Internet models with "perfect" body types and faces are hugely popular in all media, encouraging many consumers to strive to mimic their favorites and live up to unrealistic ideals for appearance. More than eight million people in the United States, most of whom are adolescent girls and young women, have developed eating disorders. Although the problem may seem like a physical one, these disorders are believed to be psychological in nature.
Eating Disorders, Second Edition explains major eating disorders, such as anorexia nervosa, bulimia nervosa, and binge-eating disorder. It also discusses their causes and risk factors as well as available treatments.
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Eating Disorders, Second Edition - Pamela Keel
Eating Disorders, Second Edition
Copyright © 2019 by Infobase
All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage or retrieval systems, without permission in writing from the publisher. For more information, contact:
Chelsea House
An imprint of Infobase
132 West 31st Street
New York NY 10001
ISBN 978-1-4381-9436-3
You can find Chelsea House on the World Wide Web
at http://www.infobase.com
Contents
Foreword
Chapters
Anorexia Nervosa
Bulimia Nervosa
Binge-Eating Disorder (BED) and Eating Disorders Not Otherwise Specified (EDNOS)
Causes of Eating Disorders
Treatment for Eating Disorders
Future Directions in Eating Disorder Treatments
Support Materials
Glossary
Further Resources
About the Authors
Index
Foreword
Think of the most complicated aspect of our universe, and then multiply that by infinity! Even the most enthusiastic of mathematicians and physicists acknowledge that the brain is by far the most challenging entity to understand. By design, the human brain is made up of billions of cells called neurons, which use chemical neurotransmitters to communicate with each other through connections called synapses. Each brain cell has about 2,000 synapses. Connections between neurons are not formed in a random fashion, but rather, are organized into a type of architecture that is far more complex than any of today’s supercomputers. And, not only is the brain’s connective architecture more complex than any computer, its connections are capable of changing to improve the way a circuit functions. For example, the way we learn new information involves changes in circuits that actually improve performance. Yet some change can also result in a disruption of connections, like changes that occur in disorders such as drug addiction, depression, schizophrenia, and epilepsy, or even changes that can increase a person’s risk of suicide.
Genes and the environment are powerful forces in building the brain during development and ensuring normal brain functioning, but they can also be the root causes of psychological and neurological disorders when things go awry. The way in which brain architecture is built before birth and in childhood will determine how well the brain functions when we are adults, and even how susceptible we are to such diseases as depression, anxiety, or attention disorders, which can severely disturb brain function. In a sense, then, understanding how the brain is built can lead us to a clearer picture of the ways in which our brain works, how we can improve its functioning, and what we can do to repair it when diseases strike.
Brain architecture reflects the highly specialized jobs that are performed by human beings, such as seeing, hearing, feeling, smelling, and moving. Different brain areas are specialized to control specific functions. Each specialized area must communicate well with other areas for the brain to accomplish even more complex tasks, like controlling body physiology—our patterns of sleep, for example, or even our eating habits, both of which can become disrupted if brain development or function is disturbed in some way. The brain controls our feelings, fears, and emotions; our ability to learn and store new information; and how well we recall old information. The brain does all this, and more, by building, during development, the circuits that control these functions, much like a hard-wired computer. Even small abnormalities that occur during early brain development through gene mutations, viral infection, or fetal exposure to alcohol can increase the risk of developing a wide range of psychological disorders later in life.
Those who study the relationship between brain architecture and function, and the diseases that affect this bond, are neuroscientists. Those who study and treat the disorders that are caused by changes in brain architecture and chemistry are psychiatrists and psychologists. Over the last 50 years, we have learned quite a lot about how brain architecture and chemistry work and how genetics contribute to brain structure and function. Genes are very important in controlling the initial phases of building the brain. In fact, almost every gene in the human genome is needed to build the brain. This process of brain development actually starts prior to birth, with almost all the neurons we will ever have in our brain produced by midgestation. The assembly of the architecture, in the form of intricate circuits, begins by this time, and by birth, we have the basic organization laid out. But the work is not yet complete, because billions of connections form over a remarkably long period of time, extending through puberty. The brain of a child is being built and modified on a daily basis, even during sleep.
While there are thousands of chemical building blocks, such as proteins, lipids, and carbohydrates, that are used, much like bricks and mortar, to put the architecture together, the highly detailed connectivity that emerges during childhood depends greatly upon experiences and our environment. In building a house, we use specific blueprints to assemble the basic structures, like a foundation, walls, floors, and ceilings. The brain is assembled similarly. Plumbing and electricity, like the basic circuitry of the brain, are put in place early in the building process. But for all of this early work, there is another very important phase of development, which is termed experience-dependent development. During the first three years of life, our brains actually form far more connections than we will ever need, almost 40% more! Why would this occur? Well, in fact, the early circuits form in this way so that we can use experience to mold our brain architecture to best suit the functions that we are likely to need for the rest of our lives.
Experience is not just important for the circuits that control our senses. A young child who experiences toxic stress, like physical abuse, will have his or her brain architecture changed in regions that will result in poorer control of emotions and feelings as an adult. Experience is powerful. When we repeatedly practice on the piano or shoot a basketball