I was an active and fairly healthy boy; at twenty I remember saying that I had not had a day's serious sickness in fourteen years. Then I wrote my first novel, working sixteen or eighteen hours a day for several months, camping out, and living mostly out of a frying-pan. At the end I found that I was seriously troubled with dyspepsia; and it was worse the next year, after the second book. I went to see a physician, who gave me some red liquid, which magically relieved the consequences of doing hard brain-work after eating. So I went on for a year or two more, and then I found that the artificially-digested food was not being eliminated from my system with sufficient regularity. So I went to another physician, who gave my malady another name, and gave me another medicine, and put off the time of reckoning a little while longer.

I have never in my life used tea or coffee, alcohol or tobacco; but for seven or eight years I worked under heavy pressure all the time, and ate very irregularly, and ate unwholesome food. So I began to have headaches once in a while, and to notice that I was abnormally sensitive to colds. I considered these maladies natural to mortals, and I would always attribute them to some specific accident. I would say, "I've been knocking about down town all day"; or, "I was out in the hot sun"; or, "I lay on the damp ground." I found that if I sat in a draught for even a minute I was certain to "catch a cold." I found also that I had sore throat and tonsilitis once or twice every winter; also, now and then, the grippe. There were times when I did not sleep well; and as all this got worse, I would have to drop all my work and try to rest. The first time I did this a week or two was sufficient; but later on a month or two was necessary, and then several months.

The year I wrote "The Jungle" I had my first summer cold. It was haying time on a farm, and I thought it was a kind of hay-fever. I would sneeze for hours in perfect torment, and this lasted for a month, until I went away to the sea-shore. This happened again the next summer, and also another very painful experience; a nerve in a tooth died, and I had to wait three days for the pain to "localize," and then had the tooth drilled out, and staggered home, and was ill in bed for a week with chills and fever, and nausea and terrible headaches. I mention all these unpleasant details so that the reader may understand the state of wretchedness to which I had come. At the same time, also, I had a great deal of distressing illness in my family; my wife seldom had a week without suffering, and my little boy had pneumonia one winter, and croup the next, and whooping-cough in the summer, with the inevitable "colds" scattered in between.

After the Helicon Hall fire I realized that I was in a bad way, and for the two years following I gave a good part of my time to trying to find out how to preserve my health. I went to Battle Creek, and to Bermuda, and to the Adirondacks; I read the books of all the new investigators of the subject of hygiene, and tried out their theories religiously. I had discovered Horace Fletcher a couple of years before. Mr. Fletcher's idea is, in brief, to chew your food, and chew it thoroughly; to extract from each particle of food the maximum of nutriment, and to eat only as much as your system actually needs. This was a very wonderful idea to me, and I fell upon it with the greatest enthusiasm. All the physicians I had known were men who tried to cure me when I fell sick, but here was a man who was studying how to stay well. I have to find fault with Mr. Fletcher's system, and so I must make clear at the outset how much I owe to it. It set me upon the right track—it showed me the goal, even if it did not lead me to it. It made clear to me that all my various ailments were symptoms of one great trouble, the presence in my body of the poisons produced by superfluous and unassimilated food, and that in adjusting the quantity of food to the body's exact needs lay the secret of perfect health.

It was only in the working out of the theory that I fell down. Mr. Fletcher told me that "Nature" would be my guide, and that if only I masticated thoroughly, instinct would select the foods. I found that, so far as my case was concerned, my "nature" was hopelessly perverted. I invariably preferred unwholesome foods—apple pie, and toast soaked in butter, and stewed fruit with quantities of cream and sugar. Nor did "Nature" kindly tell me when to stop, as she apparently does some other "Fletcherites"; no matter how much I chewed, if I ate all I wanted I ate too much. And when I realized this, and tried to stop it, I went, in my ignorance, to the other extreme, and lost fourteen pounds in as many days. Again, Mr. Fletcher taught me to remove all the "unchewable" parts of the food—the skins of fruit, etc. The result of this is there is nothing to stimulate the intestines, and the waste remains in the body for many days. Mr. Fletcher says this does not matter, and he appears to prove that it has not mattered in his case. But I found that it mattered very seriously in my case; it was not until I became a "Fletcherite" that my headaches became hopeless and that sluggish intestines became one of my chronic complaints.

I next read the books of Metchnikoff and Chittenden, who showed me just how my ailments came to be. The unassimilated food lies in the colon, and bacteria swarm in it, and the poisons they produce are absorbed into the system. I had bacteriological examinations made in my own case, and I found that when I was feeling well the number of these toxin-producing germs was about six billions to the ounce of intestinal contents; and when, a few days later, I had a headache, the number was a hundred and twenty billions. Here was my trouble under the microscope, so to speak.

These tests were made at the Battle Creek Sanitarium, where I went for a long stay. I tried their system of water cure, which I found a wonderful stimulant to the eliminative organs; but I discovered that, like all other stimulants, it leaves you in the end just where you were. My health was improved at the sanitarium, but a week after I left I was down with the grippe again.

I gave the next year of my life to trying to restore my health. I spent the winter in Bermuda and the summer in the Adirondacks, both of them famous health resorts, and during the entire time I lived an absolutely hygienic life. I did not work hard, and I did not worry, and I did not think about my health except when I had to. I lived in the open air all the time, and I gave most of the day to vigorous exercise—tennis, walking, boating and swimming. I mention this specifically, so that the reader may perceive that I had eliminated all other factors of ill-health, and appreciate to the full my statement that at the end of the year's time my general health was worse than ever before.

I was all right so long as I played tennis all day or climbed mountains. The trouble came when I settled down to do brain-work. And from this I saw perfectly clearly that I was over-eating; there was surplus food to be burned up, and when it was not burned up it poisoned me. But how was I to stop when I was hungry? I tried giving up all the things I liked and of which I ate most; but that did no good, because I had such a complacent appetite—I would immediately take to liking the other things! I thought that I had an abnormal appetite, the result of my early training; but how was I ever to get rid of it?

I must not give the impression that I was a conspicuously hearty eater. On the contrary, I ate far less than most people eat. But that was no consolation to me. I had wrecked myself by years of overwork, and so I was more sensitive. The other people were going to pieces by slow stages, I could see; but I was already in pieces.