Part 2

If you should prick your finger and extract a drop of your own blood, and examine it under a microscope, you would make the fascinating discovery that it is the home of living creatures, each having a separate and independent existence of its own. In a single ounce of blood there are more of these organisms than there are human beings upon the face of the globe. These organisms are of many kinds, but they divide themselves into two main groups, known as the red corpuscles and the white.

The red corpuscles are the smaller of the two. The body of an average man contains something like thirty million of millions of these corpuscles; a number exceeding the population of New York and London are born in the body every second. They are the oxygen conveyers of the body; the process of life is one of chemical combustion, and these corpuscles feed the fire. No remotest portion of the body escapes their visitation. They carry oxygen from the lungs and they bring back the carbon dioxide and other waste products of the body’s activities. They have been compared to men who carry into a laundry buckets of pure water, and carry out the dirty water resulting from the washing process.

The other variety of organisms are the white cells or leucocytes, and it is concerning them that the most important discoveries of modern investigators have been made. The leucocytes vary in number according to the physical condition of the individual, and according to their locality in the body. Their function is to defend the body against the encroachments of hostile organisms.

We shall take it for granted that the reader does not require to have proven to him the so-called “germ theory” of disease. The phrase, which was once accurate, is now misleading, for the germ “theory” is part of the definite achievement of science. Not only have we succeeded in isolating the specific germ whose introduction into the body is responsible for different diseases, but in many cases, by studying the history and behavior of the germ, we have been able to find methods of checking its inroads, and so have delivered men from scourges like yellow fever and the bubonic plague.

THE DEFENSES OF THE BODY

An experiment that is often tried in operating rooms furnishes a vivid illustration of the omnipresence of these invisible, yet potent, foes of life. In order to impress upon young surgeons the importance of maintaining antiseptic conditions, they are instructed to thoroughly wash their hands and arms in antiseptic soap and water; then they are told to leave their arms exposed for a few minutes, after which a microscopic examination of the bared skin will result in exposing the presence of myriads of germs. Many of these are, of course, harmless; some are even “friendly”—since they make war upon the dangerous kinds. But others are the deadly organisms which find lodgment in the lungs and cause pneumonia and tuberculosis; or the thirty odd varieties of bacilli which cause the various kinds of grippe and influenza and “colds,” which plague the civilized man; or others which, finding entrance into the digestive tract, are the cause of typhoid and other deadly fevers.

So it appears that we live within our bodies somewhat in the same fashion as isolated barons lived in their castles in the Dark Ages, beleaguered constantly by hordes of enemies that are bent upon our destruction—these being billions upon billions of disease germs. Every portion of the body has its defenses to protect it against these swarms. The skin is germ-tight in health; and each of the gateways to the interior of the body has its own peculiar guard—tears, wax, mucous membrane, etc. As Dr. Edward A. Ayers points out,—“Many of these entrances are lined with out-sweeping brooms—fine hairs similar to the ‘nap’ or ‘pile’ of carpet or plush—which constantly sweep back and forth like wheat stalks waving in the breeze. You cannot see them with the low-powered eye, but neither can you see the germs. They sweep the mucous from lungs and throat, and try to keep the ventilators free from dust and germs. Behind the scurf wall and the broom brigade of the mucous membranes, the soldier corpuscles of the blood march around the entire fortress every twenty-eight seconds” (the time occupied by the blood in its circulation through the body).

HEALTHY BODIES ARE GERM-PROOF

And again (to quote another authority, Dr. Sadler), “All the fluids and secretions of the body are more or less germicidal. The saliva, being alkaline, discourages the growth of germs requiring an acid medium. The normal gastric juice of a healthy stomach is a sure germ-killer. In the early part of digestion, lactic acid is present, and there soon appears the powerful hydrochloric acid, which is a most efficient germicide....

“The living, healthy tissues of the body are all more or less germicidal; that is, they are endowed with certain protective properties against germs and disease. This is true of many of the other special secretions, like those found in the eye and elsewhere in the body, when they are normal. The blood and lymph, the two great circulating fluids of the body, are likewise germicidal. In some conditions of disease, there may be found various substances in the blood which can destroy germs.”

THE WHITE CELLS ON GUARD

And this definitely brings us to the other kind of inhabitants of the human blood, the leucocytes, or white blood corpuscles,—and so to the germ theory of health, which science is showing to be no less true than the germ theory of disease. In their natural state these cells are transparent, spherical forms of the consistency of jelly drops, which float in the bloodstreams or creep along the inner surface of the vessel. Their function was for a long time not understood; the discovery of the real facts, perhaps the most epoch-making discovery ever made concerning the human body, the world owes to the genius of Metchnikoff, the head of the Pasteur Institute of Paris. These cells are the last reserves of the body in its defense against the assault of disease. Whenever, in spite of all opposition, the hostile germs find access either to the blood or to the tissue, the white cells rush to the spot, and fall upon them and devour them.

In their fight against the hordes of evil bacteria that invade the blood, where the battles are waged, the body’s defenders have four main ways of battling. Again we quote from Dr. Ayers: “The blood covers some germs with a sticky paste, and makes them adhere to one another, thereby anchoring them so that they become as helpless as flies on fly paper. The paste comes from the liquid of the blood, the plasma. Another blood-weapon (the ‘lysins’) dissolves the germs as lye does. A third means of defense is the ability of the white blood corpuscles to envelop and digest the living germs. One white cell can digest dozens of germs, but it may mean death to the devouring cells.

The fourth and recently discovered weapon, or ammunition, of the blood is the opsonins. Wright and Douglas in London in 1903 coined the word, which comes from the Latin _opsono_: “I cook for the table,” “I prepare pabulum for.” This is precisely what the opsonins do in the blood. They manifest this beneficial activity when invading disease germs appear. They attract white blood cells to the germs and make the bacteria more eatable for the cells. They are appetizers for the white blood cells; or sauces, which help the white blood cells to eat more of the bacteria than they could do without this spur to their hunger. Wright and Douglas demonstrated beyond peradventure the ability of the white blood cells to eat a larger number of bacteria when the latter are soaked in opsonins. They also showed that this opsonic sauce, or appetizer, which stimulates the blessed hunger of the white blood cells for disease bacteria, could be artificially produced, and hypodermically introduced into a patient’s blood, thus increasing that blood’s power of defense by raising the quantity of opsonins. They also worked out a practical laboratory technique by means of which the opsonins can be measured, or counted, with a considerable degree of exactitude, thereby making it possible to estimate within limits of accuracy any one’s ability to resist bacterial invasions. If the blood is rich in opsonins, its power to fight disease is strong. Opsonins are now inoculated into the blood at several institutions, notably McGill University in Montreal, and at the Battle Creek Sanitarium.

HOW THE WHITE CELLS DO THEIR WORK

The process by which the white cells fight for us may be watched in the transparent tissue of a frog’s foot or the wing of a bat. If a few disease germs are introduced into this tissue, the white cells may be seen to accumulate on the wall of the blood vessel just opposite where the germs have entered. “Each cell begins to push out a minute thread of its tissue,” writes Dr. Kellogg, in describing the process, “thrusting it through the wall of its own blood vessel. Little by little the farther end of this delicate filament which has been pushed through the wall grows larger and larger, while the portion of the cell within the vessel lessens, and after a little time each cell is found outside the vessel, and yet no openings are left behind. Just how they accomplish this without leaving a gap behind them is one of the mysteries for which Science has for many years in vain sought a solution. The vessel wall remains as perfect as it was before. Apparently, each cell has made a minute opening and has then tucked itself through, as one might tuck a pocket handkerchief through a ring, invisibly closing up behind itself the opening made. Once outside the vessel, these wonderful body-defenders, moving here and there, quickly discover the germs and proceed at once to swallow them. If the germs are few in number, they may be in this way destroyed, for the white cells not only swallow germs, but digest them. If the number is very great, however, the cells sacrifice themselves in the effort to destroy the germs, taking in a larger number than they are able to digest and destroy. When this occurs, the germs continue to grow; more white cells make their way out of the blood vessels, and a fierce and often long-continued battle is waged between the living blood cells and the invading germs.”

Now, it must be understood that this description is not the product of any one’s imagination, but is a definitely established fact which has been studied by scientists all over the world. Because of the importance of the discovery, and of the new views of health to which it leads, we have placed a picture of this “battle of the blood” at the front of this book. It shows the leucocytes of the human body in conflict with the germs of influenza: the black dots being the germs, and the larger grayish bodies the leucocytes. We have chosen a photograph rather than a drawing, so that the reader may realize that he is seeing something which actually has existence. We request him to study the picture and fix it upon his mind, for it is not too much to say that from it is derived every principle of health which is set forth in the course of this book.

THE PROBLEM OF HEALTH

The human body is a complex and intricate organism, in some wonderful and entirely incomprehensible way integrating the activities of all these billions of other living organisms. Each and every one of these latter has its function to fulfill, and the life of the individual body is a life of health so long as the unity of all its organisms is maintained. Outside of the body are millions of hostile organisms assaulting it continuously; and the problem of health is the problem of enabling it to make headway against its enemies for as long a period as possible. Every act of a human being has its effect upon this battle; at every moment of your life you are either strengthening the power of your own organism or strengthening your enemies. Once the organism is unable to beat back its enemies, health begins to fail and death and complete disintegration is the ultimate result.

It must be understood that the peril of these hostile germs is not merely that they devour the substance upon which the body’s own organisms have to be nourished. If that were all, they might remain in the body as parasites, and by taking additional nourishment a man might sustain life in spite of them. Nor is it even that they multiply with such enormous rapidity; the peril is that they throw off as the products of their own activity a number of poisons, which are as deadly to the human body as any known. These poisons are produced much more rapidly than they can be eliminated from the system, and so they fill the blood, and death ensues.

Thus the problem becomes clear. In the first place, what can we do to keep disease germs from securing entrance to the body; and second, what can we do to strengthen the body’s army of defense so that the fate of any which do find entrance may be immediate destruction?

HEALTH, LIKE DISEASE, IS CATCHING

In actual practice it is found that the second problem is by far the more important one. Some germs we can avoid. If we boil all the water that we drink we will not be very apt to have typhoid. If we exterminate rats and mosquitoes and flies and fleas, we will not have yellow fever, or malaria, or plague. But we cannot hope to do this at present in the case of such diseases as, for instance, consumption, grippe, and influenza. If we live in a city, we take into our lungs and throat millions of the germs of these diseases every day. Therefore the one hope that is left is to keep ourselves in such a condition of health that the army of our bodies shall be able to destroy these germs. When the blood is in a healthy condition, the white cells are numerous, powerful, and active, but when the blood flows stagnantly, or when it is impoverished, then the white cells are few and the forces of disease obtain a foothold.

Healthy men can go through many epidemics with impunity. Because the Japanese army was an army of healthy men, its death rate from those diseases which usually follow in the wake of all armies was lower than the world had ever known before. Robert Ingersoll once said that if he had been God and had made the world, he would have made health “catching,” and not disease. As a matter of fact, health is catching. It abounds in the very air we breathe, in the water we drink, in the movements of every muscle and the play of every fibre and nerve of the body; it comes from and is nourished by each and every one of the bodily actions and functions; while disease is only secured by persistent transgressions of the proper way of living, and by injurious habits and customs that result in lowering the “vital resistance.”

This vital resistance is the innate power of the body to keep itself strong; its very lifeforce. This is what we mean when we say that this or that person has “a good constitution,” or has “a weak constitution.” This is the capital in the bank of each individual life, placed there by Nature at the birth of that life, and increased or diminished by each and every action of our bodies, and also of our minds. As Rokitansky, the eminent German scientist, said, “Nature heals. This is the first and greatest law of therapeutics—one which we must never forget. Nature creates and maintains, therefore she must be able to heal.”

Many of the most notable discoveries and experiments of modern science concur in demonstrating that the natural and innate healing power of the body is man’s greatest resource in combating disease and maintaining health. It is the body itself which cures the sick man; his own vitality, and not the drug or medicants which he may take. These may assist the healing process, but they do not set going the healing processes themselves. More often, indeed, they are distinct detriments. They stamp out or banish the distressing symptoms of ailments, and thus in effect they silence the signal bells of danger which the body rings at the approach of disease.

Modern science has turned its forces upon this question of maintaining at its highest potentiality the ability of the body to resist disease. All the habits of the human race have been investigated in the light of this idea, and some have been found to be wise and others to be unwise. These conclusions, with the evidence therefor, are the subjects of our book.

OUR FOOD IS THE CHIEF FACTOR

It has been found that the most important problems connected with health are those of nutrition—the questions of what and when and how and how much food we ought to eat.

Every language under the sun contains a prayer somewhat similar to that which we have in the Anglo-Saxon tongue, “Give us this day our daily bread.” If we stop to think for a moment, we realize that next to the air we breathe, and the water we drink, our food is the most important consideration in the maintenance of life. All this is the veriest commonplace; yet the fact remains that it is very rarely indeed that we do stop to think upon the subject of our food. It is something that we take for granted, like life itself. In the regular routine of our days our meals become fixed habits, and the taking of food an almost involuntary custom. It requires some extraordinary event to arouse us to a just appreciation of the importance of knowledge on this subject. Or else the coming of one of the myriad forms of digestive diseases will serve the purpose of introducing the subject to our notice.

Our blood is made directly from what we eat, and that old Saxon proverb is true which says that every man has lain in his own trencher. Man is his food. Each human body is made by chemical action from its food. All our actions and all our thoughts come from what we eat, even as the movements of machinery proceed from the coal fed into the boilers of the engine which operate the machine. If we eat the right food, namely, the food which contains the elements our bodies require in the proper proportions, we repair all waste, replace broken down tissue and supply ourselves with physical and mental energy for our toils and joys in life; while if we eat the wrong foods we quickly injure our delicate though powerful physical and mental machinery.

All this would seem to be obvious; yet most people would grant that they have still much to learn concerning what really constitutes the best foods, and about the best ways of preparing, or making, or using those foods. Few of us possess anything more definite to guide us in our eating than the habits we acquired as children, or habits picked up in later life from following the example of our friends, or the food fashions of the day—for there are such things as fashions in foods and in the eating of foods, even as there are fashions in clothes and the making and wearing thereof. In this place it is proposed to study the subject of food from one standpoint, namely, its effect upon the Battle of the Blood; its relation to the vital resistance of the body whereby health is maintained.

II

HOW TO EAT: THE GOSPEL OF DIETETICS ACCORDING TO HORACE FLETCHER

We shall first of all see what modern science has to tell us concerning the question of _how_ we ought to eat.

It may not seem possible that anything essential remains to be said at this late day on the subject of one of the commonest and decidedly most necessary of all human acts. That there should be knowledge of the utmost importance to learn regarding the actions and movements of the tongue, the teeth, and the jaws, may come with as much surprise to the majority of our readers as it did to us when we first hit upon this disturbing, but illuminating, fact.

The act of eating is the starting point of the long series of processes whereby our bodies are nourished. It is the only act of them all which lies within our control. We can directly supervise the work of our mouths; we can watch over the action of the teeth, and tongue, and palate; but we can not supervise the work of the stomach, or of the intestinal tube. Once we have swallowed our food, our mastery over it has ceased—except for some hit-or-miss participation in the further processes of its digestion by means of pills or potions. Realizing this, we come to recognize the basic importance of knowing the right way of eating.

THE STORY OF HORACE FLETCHER

This knowledge the world owes to Horace Fletcher, the American business man who has made many of the greatest physiologists of our times embark upon years-long series of experiments and inquiries into the problems of man’s nutrition. As a result, the text-books of physiology are now being rewritten; and as a further result, tens of thousands of men and women, among them some of the best known authors, physicians, clergymen, military men, and business men of both Europe and America, have been restored to health by the knowledge of how to eat their food.

This knowledge Mr. Fletcher gained at the very door of death, and in no more interesting and striking fashion could the importance of it be shown than by the relation of his remarkable case.

At the age of forty-five, after a varied and adventurous career, as miner, and explorer, and sailor, and hunter, Mr. Fletcher had won wealth, and retired from his business in order to devote himself to long-cherished interests in art and philosophy. He was still comparatively young, he was a member of many clubs, he had warm friends in all the capitals and countrysides of the world (Mr. Fletcher being one of the most untiring of globe-trotters), and in all ways except one he was equipped and ready for a long life of ease and enjoyment.

The one way in which he was not equipped was—in health.

HOW A STRONG MAN BROKE DOWN

Once he had been a man of robust physique, a champion gymnast and athlete; he had been president of the far-famed Olympic Club in San Francisco (which he founded, and where the pugilist Corbett was discovered), and had won plaudits even from famous professionals for his prowess with the gloves.

But he had overdrawn his account at the bank of life. He had expended more vital resistance than he had stored up; to such an extent, indeed, that when Mr. Fletcher went to the insurance companies at the time he retired from business he was rejected by them all; he was obese; he was suffering from three chronic diseases, and he was dying fast. Such was the verdict given by the skilled and experienced medical examiners of the life insurance companies. And instead of entering upon a long life of ease and enjoyment, he was thus condemned, seemingly, to a short life of invalidism and suffering.

FIGHTING FOR LIFE

But Mr. Fletcher declined to accept any such decision as that. He decided that he would regain his health—not that he would _try_ to regain his health, but that he _would_ regain his health.

He first turned to the physicians. Possessed of wealth, he was able to secure the services of many of the most able specialists of the world. He visited the most celebrated “cures” and “springs” and sanitariums of Europe and America. Nothing availed. He found passing relief now and then, but no permanent good. He gained no health, in other words, but obtained merely temporary abatement of this or of that disease.