e of the egg (albumen) and the
water.

An interchange takes place, and the water passes towards the albumen. As
the albumen does not pass out freely towards the water, the membrane
becomes distended, like a little bag at the top of the egg.

162. Ill Effects of a too Generous Diet. A generous diet, even of
those who take active muscular exercise, should be indulged in only with
vigilance and discretion. Frequent sick or nervous headaches, a sense of
fullness, bilious attacks, and dyspepsia are some of the after-effects of
eating more food than the body actually requires. The excess of food is
not properly acted upon by the digestive juices, and is liable to undergo
fermentation, and thus to become a source of irritation to the stomach and
the intestines. If too much and too rich food be persistently indulged in,
the complexion is apt to become muddy, the skin, especially of the face,
pale and sallow, and more or less covered with blotches and pimples; the
breath has an unpleasant odor, and the general appearance of the body is
unwholesome.

An excess of any one of the different classes of foods may lead to serious
results. Thus a diet habitually too rich in proteids, as with those who
eat meat in excess, often over-taxes the kidneys to get rid of the excess
of nitrogenous waste, and the organs of excretion are not able to rid the
tissues of waste products which accumulate in the system. From the blood,
thus imperfectly purified, may result kidney troubles and various diseases
of the liver and the stomach.

163. Effect of Occupation. Occupation has an important influence upon
the quantity of food demanded for the bodily support. Those who work long
and hard at physical labor, need a generous amount of nutritious food. A
liberal diet of the cereals and lean meat, especially beef, gives that
vigor to the muscles which enables one to undergo laborious and prolonged
physical exertion. On the other hand, those who follow a sedentary
occupation do not need so large a quantity of food. Brain-workers who
would work well and live long, should not indulge in too generous a diet.
The digestion of heavy meals involves a great expenditure of nervous
force. Hence, the forces of the brain-worker, being required for mental
exertion, should not be expended to an unwarranted extent on the task of
digestion.

164. Effect of Climate. Climate also has a marked influence on the
quantity of food demanded by the system. Much more f