Wednesday 17 July 2013

Weight-Regulating Machinery of the body


WEIGHT REGULATING MACHINE OF THE BODY
The body is equipped with a great many automatic checks and balances for preserving healthy conditions in its internal environment and for safeguarding its vital processes. Is there any safe regulating machinery for stopping the storage of fat when the depots are comfortably full? It would seem that regulation of the deposition of fat would be an important task, since both the reduction of fat reserves below the danger mark and the accumulation of fat to the extent of making the body ‘’a bloated bondholder’’ are detrimental to health.
The regulation of body weight by automatic control over the amount of fat deposited in the fat depots would mean the application of a simple mathematical formula. Food intake (in terms of calories) must exactly equal energy output (in terms of calories) to maintain body weight at a constant level. To gain weight, food intake must exceed energy output. To loss eight, food intake must be less than energy output so that the body will use, or burn, its excess fat to make up the difference between food and energy expenditure.
The assumption that the body does have an automatic weight-regulating mechanism is based on the fact that a great many people, especially those of slender and medium build, maintain practically the same weight throughout adult life. Although medico-actuarial tables show that the average man or woman has a tendency to gain weight year after year, it has been pointed out that these average increase were arrived at by measurements obtained from a mixed population including some individuals who do not change their weight at all and others who gain in weight at a faster rate than the average. Another bit of evidence is the fact that the frankly obese, who seem to put on weight at every turn and twist of life’s journey, do reach a limit, that is, appoint at which their weight remains static.
The nature of this weight- regulating machine is obscure. Both heredity and the nervous and endocrine systems undoubtedly influence its operation. It is a well-established fact that stoutness and leanness are hereditary variations of body build.
And endocrine or nervous-system disturbances, or both, whether inherited or acquired during life, have been found in many cases of generalised obesity and of grotesque distribution of body fat.
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