MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Electrocardiogram (ECG) electrodes being attached to the chest of an obese man. An ECG measures a patient's heartbeat, and can be used to diagnose many disorders of the heart. Obesity is a condition in which a person's weight is more than 20% more than is desirable for his height. It can cause numerous health problems, including heart disease, diabetes and strokes.
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