Exhaustion Theory
In 1888 Pasteur advanced the exhaustion theory wherein he maintained that the body which had no food for the germ to feed upon would be immune; in other words, when the food supply was used up the germ could no longer develop and grow. An illustration of this is the yeast which will cease to grow when the sugar in the culture media is exhausted. This theory was rejected but has since been revived and is now considered to have some merit. This theory comes very nearly agreeing with the chiropractic idea, which will be discussed later.