MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Blood sample being taken from the arm of an obese man. The removed blood can then be tested, for instance for its cholesterol level. Obesity is a condition in which a person's weight is more than 20% above that desirable for his height. It can cause numerous medical conditions, including heart disease, diabetes and strokes.
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