The human body analyzed and separated into something like a dozen substances, among which are water, which is three-fourths of the body's structure; carbon, lime, phosphorus, iron, potassium, salt and so on. By reading a book on anatomy you can learn just exactly the proportions of the substances in the human body. All these chemicals are formed in the shape of little cells, myriads of which are in the body. These cells are constantly being destroyed and new ones made to take their place. Parts of the body are replaced every twenty-four hours, other parts less often. Scientists tell us that the whole body is replaced every seven years. Every move you make destroys cells which nature has to replace. Isn't it reasonable then to conclude that if a man should fail to eat enough lime for his body-building, his bones would suffer. If he does not get enough iron his blood will suffer, and so on. I am definitely convinced that most of the actual physical ailments are caused by a deficiency of the mineral elements in the body. Phosphorus and potash are necessary to the human welfare. These elements are in the husk of the wheat and the husk is taken off in making flour, and the flour is mostly starch. The person who lives mostly on white bread will suffer from lack of phosphorus and potash. Phosphorus also is found in the skin of an apple, so if you peel an apple you do not get the phosphorus. FOOD The Food We Eat Is Fuel for the Human Engine The practice of medicine in the past has been directed towards the curing of developed disease and physical ailments. The practice of medicine in the future is to be along the line of preventive practice. Science is showing us how to prevent infection. Science is fighting the deadly microbe which comes to us in the air we breathe, the water we drink, and the food we eat and the infected things we touch. Nature has supplied the human body with a home guard of necessary bacteria and in the circulation system are phagocytes which fight the invading microbes and generally destroy them. When the system is weakened through disease, through lack of exercise or through improper food, disease has an easy time. The important thing to prevent disease is to keep yourself fit, and the golden prescription which I have given in PEP will serve to keep you in perfect health. I want you to remember this golden prescription; it is composed of the following: Good Air, Good Water, Good Sunshine, Good Food, Good Exercise, Good Cheer, Good Rest and Good Thought. If you take this golden prescription you will make of yourself a giant in brain and brawn strength. You can't get health out of a bottle. You can't get the system to absorb iron if you take it in the form of tincture of iron. You can eat a pound of rust, which is oxide of iron, and none of that iron will be absorbed in the system.