This book is intended as a reference volume only, not as a medical manual. The information given here is designed to help you make informed decisions about your health. It is not intended as a substitute for any treatment that may have been prescribed by your doctor. If you suspect that you have a medical problem, we urge you to seek competent medical help.

Mention of specific companies, organizations, or authorities in this book does not imply endorsement by the author or publisher, nor does mention of specific companies, organizations, or authorities imply that they endorse this book, its author, or the publisher.

Internet addresses and telephone numbers given in this book were accurate at the time it went to press.

© 2016 by Rodale Inc.

Photographs © 2016 by Rodale Inc.

All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any other information storage and retrieval system, without the written permission of the publisher.

Prevention is a registered trademark of Rodale Inc.

Book design by Amy C. King

Library of Congress Cataloging-in-Publication Data is on file with the publisher

ISBN 978–1–62336–789–3 paperback
ISBN 978–1–62336–790–9 e-book

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