The explanation for underweight will be found in the person’s common foundation of disease, intensified by the continual eating of harmful food; both these errors or unfavorable factors have existed, as a rule, for the greater part of the individual’s life. The exceptions are those few cases wherein the person has been suffering from some recent ailment and as a result of or subsequent to which a great loss of weight followed.
Quite a large percentage of people who are habitually underweight have a tendency to be tuberculous or actually are suffering from some form or other of tuberculosis.
In the writer’s experience, all people suffering from underweight, who have had their common foundation of disease turned into a common foundation of good health and have had their food supply carefully selected as to absolute freshness and purity, invariably gained weight and no longer complained of underweight. In no instance was the condition of underweight replaced by a condition of overweight.