obesity

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obesity,

condition resulting from excessive storage of fat in the body. Obesity is now usually defined using a formula known as the body mass index (BMI), in which weight (in kilograms) is divided by height (in meters) squared. A person with a BMI of 25 or above is generally considered overweight; with one of 30 or above, obese. It has been estimated that roughly two thirds of American adults are overweight or obese, and that more than a third are obese.

Health and Social Implications

Obesity is a major public health concern because it predisposes the individual to many disorders, such as noninsulin-dependent diabetesdiabetes
or diabetes mellitus
, chronic disorder of glucose (sugar) metabolism caused by inadequate production or use of insulin, a hormone produced in specialized cells (beta cells in the islets of Langerhans) in the pancreas that allows the body to use and store
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, hypertensionhypertension
or high blood pressure,
elevated blood pressure resulting from an increase in the amount of blood pumped by the heart or from increased resistance to the flow of blood through the small arterial blood vessels (arterioles).
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, strokestroke,
destruction of brain tissue as a result of intracerebral hemorrhage or infarction caused by thrombosis (clotting) or embolus (obstruction in a blood vessel caused by clotted blood or other foreign matter circulating in the bloodstream); formerly called apoplexy.
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, and coronary artery diseasecoronary artery disease,
condition that results when the coronary arteries are narrowed or occluded, most commonly by atherosclerotic deposits of fibrous and fatty tissue. Coronary artery disease is the most common underlying cause of cardiovascular disability and death.
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, and has been associated with an increased incidence of certain cancers, notably cancers of the colon, rectum, prostate, breast, uterus, and cervix. In contemporary American society, obesity also carries with it a sometimes devastating social stigma. Obese people are often ostracized, and discrimination against them, especially in hiring and promotion, is common.

Causes of Obesity

Obesity research has yielded a complicated picture of the underlying causes of the condition. The simple cause is ingestion of more calories than are required for energy, the excess being stored in the body as fat. Inactivity and insufficient exercise can be contributing factors; the less active the person, the fewer calories are needed to maintain normal body weight. Overeating may result from unhealthful patterns of eating established by the family and cultural environment, perhaps exacerbated by psychological distress, an emotional dependence on food, or the omnipresence of high-calorie foods.

In some cases, obesity can come from an eating disordereating disorders,
in psychology, disorders in eating patterns that comprise four categories: anorexia nervosa, bulimia, rumination disorder, and pica. Anorexia nervosa is characterized by self-starvation to avoid obesity.
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. It has been shown, for example, that binging for some people releases natural opiates in the brain, providing a sense of well-being and physical pleasure. Other studies have found a strong relationship between obesity in women and childhood sexual abuse.

Some weight-loss experts see obesity as based upon genetics and physiology rather than as a behavioral or psychological problem. For example, rat studies have shown that fat cells secrete a hormone that helps the rat's brain assess the amount of body fat present. The brain tries to keep the amount of that hormone (which also appears to act on the brain area that regulates appetite and metabolic rate) at a set level, resulting in the so-called set point—a weight that the body comes back to, even after resolute dieting. The gene that encodes this hormone, called the obese or ob gene, has been isolated in both rats and humans. In addition, a gene that influences obesity and the onset of diabetes has been identified. It has been estimated that from 8 to 30 different genes may influence obesity.

Treatment

Radical treatments for weight loss have included wiring shut the jaw, operations that reduce the size of the stomach, and intestinal bypass operations circumventing a large area of the small intestine, limiting the area where food is absorbed. The "diet pills" of the 1960s, essentially amphetamines such as Dexedrine, are now seldom prescribed for weight loss. Fenfluramine and dexfenfluramine, drugs formerly used to achieve short-term weight loss, were withdrawn from the market following concerns that they could cause heart valve damage. Drugs to treat obesity now include orlistat (Xenical), which acts to block absorption of dietary fat in the intestine. In 2007 an over-the-counter version of orlistat was approved by the Food and Drug Administration.

Although the study of obesity is yielding many possibilities for treatment, the main focus remains diet (especially a diet limiting fat calories) and exercise, often coupled with emotional and behavioral support. The long-term weight-loss success of most attempts at dieting, however, is notoriously low. Groups such as Overeaters Anonymous, modeled after Alcoholics AnonymousAlcoholics Anonymous
(AA), worldwide organization dedicated to the treatment of alcoholics; founded 1935 by two alcoholics, one a New York broker, the other an Ohio physician. They developed a 12-step program that has made coping with alcoholism possible for countless people.
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, give support to people with weight problems and eating disorders.

Obesity

 

the excess accumulation of fatty tissue in man that results from overeating combined with insufficient muscular activity. Obesity is a disease that results from the predominance of fat synthesis and storage over fat breakdown.

One of the principal mechanisms responsible for obesity is the disruption of the coordination between fat metabolism and carbohydrate metabolism. This disruption intensifies the conversion of carbohydrates to fats. A pathological metabolism or tendency toward abnormally large fat cells can be hereditarily transmitted. Overeating in general and the overconsumption of carbohydrate foods, such as dishes that contain flour and sugar, encourage the manifestation of a hereditary predisposition to obesity.

Obesity can also result from certain diseases of the central nervous system or from endocrine disorders—especially a failure in hypothalamic regulation. Metabolic disturbances, poor eating habits, and lack of exercise can also lead to obesity. Although the disease can occur at any age, it usually first appears in childhood. The greatly increased incidence of obesity in the 20th century is also related to scientific and technological progress, for example, automation and mechanization of many industrial and household processes with the corresponding decrease in muscular activity. According to the World Health Organization (1972), about 30 percent of the population of the economically developed countries is 20 percent or more over the normal weight. The average life expectancy of obese individuals is five to ten years below normal.

Obesity is manifested by a considerable increase in weight, owing to the accumulation of fat in the subcutaneous fatty tissue, omentum, mediastinum, pericardium, and renal capsule. It interferes with the functioning of the heart, alters the locomotor apparatus, and promotes early aging. Metabolic disturbances that result from obesity can lead to the development of atherosclerosis and diabetes mellitus. Several degrees of obesity are distinguished: first-degree obesity involves a 29-percent weight increase above normal; second-degree, a 30- to 49-percent increase; third-degree, a 50- to 99-percent increase; and fourth-degree, a 100-percent or greater increase. Fat is sometimes deposited evenly, sometimes only in one part of the body; the latter, localized, form of obesity is called lipomatosis.

Obesity is treated with a properly balanced diet, a supervised health regimen, dietotherapy, physical therapy, and anorexigenics. In complicated forms of obesity, efforts are made to eliminate the underlying causes. Prevention of obesity must start in childhood with the establishment of such routines as a properly balanced diet and a healthy amount of physical activity.

REFERENCES

Leites, S. M. Patofiziologiia zhirovogo obmena. Moscow, 1964. (Bibliography.)
Egorov, M. N. “Ozhirenie.” In Mnogotomnoe rukovodstvopo vnutrennim bolezniam, vol. 8. Edited by E. M. Tareev. Moscow, 1965.
Leites, S. M., and N. N. Lapteva. Ocherkipo patofiziologii obmena veshchestv i endokrinnoi sistemy. Moscow, 1967.
Prediabet i ozhirenie. Moscow, 1973.

IU. A. KNIAZEV

What does it mean when you dream about obesity?

The popular psychological interpretation of obesity is lack of self-esteem and overindulgence in fear and denial; layers of protection to insulate the dreamer from involvement or action; hopelessness and helplessness to express power and authority; fear that rejection will be the only reward for effort. Other possible meanings are the “fat cat” who ate the mouse, being “full of oneself,” or fattening up the livestock (for slaughter). (See also Fat).

obesity

[ō′bē·səd·ē]
(medicine)
An excessive accumulation of body fat which confers health risks such as diabetes, cardiovascular diseases, arthritis, and some types of tumors.

Obesity

(dreams)
As usual, the interpretation of this dream depends on you. You may be concerned about your looks and fear that you are becoming fat. Be realistic in regard to this area of your life. If you are very thin and cannot stop worrying about your weight, you should see a doctor. Psychologically speaking, obesity usually is a sign that the individual has issues with self-esteem and personal power. In dreams about obesity, fat emotionally insulates us from others and isolates us physically.
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