Tuesday, 19 August 2014

OBESITY

Obesity is a major health problem. It affects a large proportion of the population and adversely affects health and longevity. It either is a cause or is correlated with health problems such as diabetes, coronary heart disease, and hypertension, and such physiological effects as depression, withdrawal, poor self concept, and self pity. Many agree that reducing the incidence of obesity would advance public health. Our society is tremendously preoccupied with obesity. Data from a 1985 National Health Interview Survey indicated that 45% of females and 27% of males were trying to lose weight. Weight reduction is a multibillion-dollar industry; programs specifically aimed at weight management have spread rapidly in recent years. Nevertheless, obesity persists in our society. BODY COMPOSITION Body weight consists of many components, the relative proportions of which vary among individuals. Total body weight, which includes bone, muscle, fat, blood, and so on, is conveniently divided into the lean body mass and fat mass. Lean body mass is the weight of all body tissue except fat. Fat mass is the portion of the total body weight that is composed of fat tissue. Body fat is stored in various organs of the body, such as the heart, liver, lungs, and brain. In addition, body fat is retained in adipose tissue, including the fat surrounding various internal organs as well as the subcutaneous layer of fat just beneath the skin. Some body fat is essential as an energy store, for protection of internal organs, as a component of nerves and cell membranes, and as insulation against heat loss. Essential body fat is 3% to 5% for adult males and 11% to 14% for adult females of their total body weight, respectively. The average college-age woman has between 20% and 25% of her total body weight made up of fat. The average college-age man has between 12% and 18% body fat. However, it must be indicated that persons who engage in strenuous physical activities on a regular basis tend to have lower body fat percentages. It is recommended that body fat percentage not go below 5% in men and 12% in women because a certain amount of body fat is necessary for good health

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