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CHAPTER IV THE QUANTITY REQUIRED The following are the quantities
which are generally accepted at the present time as a sufficient
daily diet for a man of average weight, doing a moderate amount of
muscular work. Weight in Grams.Weight inOz.Energy Value in
Calories.Protein . . .IOO375400Fat ....loo3'75900Carbohydrates
.500iS'oo2OOOTotal Energy Value, 3300 calories Of course, the
energy value must be greater if more work is done, and conversely:
so that we may have such figures as these? Light work . 3000
calories Moderate work . 3500,, Heavy work . 4000 or more calories
Since part of our food is consumed for the purpose of maintaining
the body temperature, in cold weather the total calorie requirement
is greater than in hot weather. Thus, according to Langworthy
(1908), the average energy value of the diet of the Egyptian
labourer is 2825. In the Tropics, indeed, where the external
temperature may be higher than that of the body, it would clearly
be of advantage if no heat were produced. But the machinery, as a
whole, is not of the high degree of efficiency required for this to
be the case. Heat, therefore, must be got rid of, chiefly by
evaporation of sweat, but the actual production tends to be kept as
low as possible by reduction of unnecessary muscular work. It may
be noticed that chief stress seems to be laid in diet tables on the
energy or calorie value of the food. This is justified by the fact,
already mentioned, that, if anyreasonable kind of combination of
foodstuffs be consumed, it will be found that, if taken in the
amount necessary to afford the energy value, sufficient protein
will be contained in it without further addition. Natural
foodstuffs, even potatoes, contain more protein than is often
supposed to be the case. Pure products extr...
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