Foods, as we receive them from the bountiful hand of Nature, are not fitted for entrance into the blood and lymph or for the cells. They must undergo a disorganizing and refining process by which the structure of the food is broken down and the useful is separated from the useless in food. This process is called digestion.

The process by which apples, corn, beans, celery, are transformed into blood, bones, nerves, muscles, skin, hair and nails, is both complicated and intensively interesting. Digestion, the first step in this wonderful process, is the process by which food is prepared (in the mouth, stomach and intestines) for absorption into the blood and lymph to be used by the body. Digestion is carried on partly by mechanical, partly by chemical means.