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By uniting with oxygen at the cells, they supply heat and the other forms of bodily force. This is perhaps their only purpose. Proteids also serve this purpose, but they are not so well adapted to supplying energy as are the carbohydrates and the fats.
This can be done by fasting or by dietary change, usually by eliminating all fats, sugars and refined starches. Alcohol and tobacco must instantly and forever become only past memories. It is almost as essential to eliminate flesh protein foods and dairy. Should that prove entirely too painful, fish in small quantities and only one or two times a week is tolerable.
Adulteration of solid or semi-liquid fats, especially lard, butter, and tallow, with vegetable oils are readily detected by this method, since the latter yield on examination a high percentage of iodine.
Sleep was a fitful, dream-haunted thing. Food was now mostly a kind of gruel, rich in starches, proteins, fats and vitamins each meal differently flavored, up to the number of ten flavors, in a manufacturer's attempt to mask the sameness. Add water to a powder heat and eat. The spaceman's usual diet, while afield...
Their faces and hands are weather-beaten and wrinkle early. Despite their general cleanliness, they often look greasy and smell to high heaven because of their habit of anointing hair and skin with fats and oils, especially fish-oil.
But it is not enough. To a person who has been in Europe since the war began the question of the importance of fats is no longer debatable. Having practically gone without them, he knows they are important. In Germany it is the lack of fat that is the cause, perhaps, of the most discomfort and makes the German most dissatisfied with his rations.
They include kreatin and allied compounds, and are the chief ingredients of beef tea and meat extract. Fats. Carbohydrates. Mineral Matters. In this classification, water is not taken into account, for the reason that it is not a true nutrient, although of vital importance to the body.
*Summary.*—Materials called foods are introduced into the body for rebuilding the tissues, supplying energy, and aiding in its general work. Only a few classes of substances, viz., proteids, carbohydrates, fats, water, and some mineral compounds have all the qualities of foods and are suitable for introduction into the body.
In your day there were many absurd beliefs, for example the so-called 'fats' that were so vehemently avoided, are actually quite healthy, while on the other hand, protectionism and socialism are quite absurd ideas, and yet they were held dear. But today we have no such presuppositions, today we understand the world and know justice where your society knew only its shadows.
The proposition of how much carbohydrates the hen eats is chiefly determined by the quantity of grain she consumes. Of fats there are many kinds of which the composition is definitely known. The amount of fats the hen eats is unimportant because she makes starch into fat.
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