There is no question that meat-eating is inconvenient, expensive, and dirty. I have no doubt that some day we shall know enough to be able to find for every individual a diet which will keep him at the top of his power, without the maintenance of the slaughter-house. But we do not possess that knowledge at present; at least, I personally do not possess it. I happen to be one of those individuals--there are many of them--with whom milk does not agree; and if you rule out milk and meat, you find yourself compelled to get a great deal of your protein from vegetable sources, such as peas, beans and nuts. All these contain a great deal of starch, and thus there is no way you can arrange your diet to escape an excess of starch. Excess of starch, so my experience has convinced me, is the deadliest of all dietetic errors. It is also the commonest of errors, the cause, not merely of the common throat and nose infections, but of constipation, and likewise of diarrhea, of anemia, and thus, through the weakening of the blood stream, of all disorders that spring from this source--decaying teeth and rheumatism, boils, bad complexion, and tuberculosis. Starch foods are the cheapest, therefore they form the common diet of the poor, and are responsible for the diseases of undernourishment to which the poor are liable. On the other hand, of course, there are perfectly definite diseases of overnourishment; high blood pressure, which culminates in apoplexy; kidney troubles, which result from the inability of these organs to eliminate all the waste matter that is delivered to them; fatty degeneration of the heart, or of the liver, or any of the vital organs. You may cause a headache by clogging the blood stream through overeating, or you may cause it by eating small quantities of food, if those foods are unbalanced, and do not contain the mineral elements necessary to the making of normal blood. Whatever the trouble with your health, it is my judgment that in two cases out of three you will find it dates back to errors in diet. I do not think I exaggerate in saying that a knowledge of what to eat and how much to eat is two-thirds of the knowledge of how to keep yourself in permanent health. CHAPTER XX ERRORS IN DIET (Discusses the different kinds of foods, and the part they play in the making of health and disease.)