The number of people who are obese is rising rapidly throughout the world, making obesity one of the fastest developing public health problems. The World Health Organization has described the problem of obesity as a "worldwide epidemic". Nevertheless, North America has a particular high prevalence of obesity as compare to the other part of the world. According to Time magazine survey one half of North American population in overweight enough to be defined as obese. Doctors consider that this proportion is incredible, almost like an epidemic. Also, a variety of illnesses, including cancer, diabetes and heart diseases, are directly related to obesity and the medical costs are very expensive.

Obesity is a condition in which there is excess body fat. However, it is difficult to measure fat directly but it can be estimated by "correcting" body weight for height. Obesity is thus usually defined as having a body mass index (BMI) of 30 or h

The resulted obesity has affected Americans health and has become a cause of several physical diseases. According to American obesity association persons with obesity are at risk of developing one or more serious medical conditions, which can cause poor health and premature death. Obesity has been linked to several serious medical conditions, including diabetes, heart disease, high blood pressure, and stroke. It is also associated with higher rates of certain types of cancer. Doctors generally agree that the more obese a person is, the more likely he or she is to have health problems. Other than physical problems obesity also causes emotional and psychological distress.

igher. A BMI of 30, in most cases, means that an individual is about 30 pounds over their ideal weight. Obesity can also be classified according to where in the body the excess fat is stored.

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