Obesity is a complex disorder involving an excessive amount of body fat.
1. Obesity
Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have a negative effect on health, leading to reduced life expectancy and or increased health problems.In Western countries, people are considered obese when their body mass index BMI ,a measurement obtained by dividing a person s weight by the square of the person s height, exceeds 30 kg m2, with the range 25 30 kg m2 defined as overweight. Some East Asian countries use stricter criteria.
Obesity increases the likelihood of various diseases, particularly heart disease, type 2 diabetes, obstructive sleep apnea, certain types of cancer, and osteoarthritis.Obesity is most commonly caused by a combination of excessive food energy intake, lack of physical activity, and genetic susceptibility, although a few cases are caused primarily by genes, endocrine disorders, medications, or psychiatric illness. Evidence to support the view that some obese people eat little yet gain weight due to a slow metabolism is limited. On average, obese people have a greater energy expenditure than their thin counterparts due to the energy required to maintain an increased body mass.
2. How common is obesity
Obesity has reached epidemic proportions in the United States. Over two thirds of adults are overweight or obese, and one in three Americans is obese. The prevalence of obesity in children has increased markedly. Obesity has also been increasing rapidly throughout the world, and the incidence of obesity nearly doubled from 1991 to 1998.
3. What causes obesity
The balance between calorie intake and energy expenditure determines a person s weight. If a person eats more calories than he or she burns metabolizes , the person gains weight the body will store the excess energy as fat . If a person eats fewer calories than he or she metabolizes, he or she will lose weight. Therefore the most common causes of obesity are overeating and physical inactivity. Ultimately, body weight is the result of genetics, metabolism, environment, behavior, and culture.
4. symptoms
Obesity is likely when an individual s body mass index BMI is 30 or higher. Your body mass index is calculated by dividing your weight in kilograms kg by your height in meters m squared.For most people, BMI is a reasonable estimate of body fat. However, BMI doesn t directly measure body fat, so some people, such as muscular athletes, may have a BMI in the obese category even though they don t have excess body fat. Ask your health care provider if your BMI is a problem.
5. When to see a doctor
If you think you may be obese, and especially if you re concerned about weight related health problems, see your doctor or health care provider. You and your provider can evaluate your health risks and discuss your weight loss options.

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