A celebrated English doctor once made the remark that "most men dig their graves with their teeth"! How right he was will be appreciated after we understand the process by which food is prepared in the body for its use, how certain portions are selected and others rejected and gotten rid of. Failure to thoroughly and regularly get rid of waste or useless matter that has been eaten or produced in the body as a result of digestion results in what everybody knows as constipation. Food, as generally eaten by the average individual, may be divided into two great classes: fuel or energy-producing material, represented by sugar, starch, oils and fats, and repair or building material, such as is represented by the flesh of beast, fowl or fish, the casein of milk, white of egg, gluten of wheat, etc., which is known as protein (the Greek word for flesh). The digestion of fuel foods, sugar, starch or fat is a comparatively simple process. Starch is changed into a special kind of sugar, and sugar eaten as such into this same special kind of sugar, which is burned up in the muscles, as is required. Any excess of this special form of sugar is stored up in the liver and in the muscles, just as one lays in a supply of coal or wood. Fat or oil is changed slightly into a form that the body can use, sent to the blood, and burned as is necessary. Any excess not immediately needed is stored up in the body, packed away around organs, between muscles and under the skin. Not so with the building or repair material. * The body cannot store away excess of building material as it can sugar or fat. On the contrary, any amount above or over the quantity needed for immediate use must be gotten rid of and sent out of the body. Moreover, while the digestion of sugar or 4