food which has caused the most controversy.

First: As to the amount needed.

Second: As to whether animal flesh protein is necessary.

[Sidenote: _Chittenden_]

AMOUNT NEEDED: It was thought for many years that 150 grams or 5 ounces
of dry protein (equivalent to about 1-1/2 pounds lean meat) per day was
necessary. But experiments of Chittenden and others have proved that
considerably less is sufficient, and that the health is improved if less
is taken.

Chittenden's standard is 50 grams, or 1-2/3 ounces, dry protein
(equivalent to 1/2 pound meat per day). This is considered by many as
insufficient. A variation from 1-2/3 to 3 ounces dry protein per day
will give a safe range. (ROSE.)

[Sidenote: _Approx. 240 to 360 C Per Day_]

_The amount of protein needed is comparatively independent of the amount
of physical exertion_, thus differing from the purely fuel foods,
carbohydrates and fats, which should vary in direct proportion to the
amount of physical exertion. In general, 10 to 15 per cent of the total
calories per day should be taken as protein. An excess is undoubtedly
irritant to the kidneys, blood vessels, and other organs, and if too
little is taken the body tissues will suffer.

Not all of the protein should be taken in the form of animal protein; at