Starvation and indigestible or innutritious food contribute to debility,
and lessen the power of resistance. Hence in the poor, half starved
denizens of city slums, and among neglected herds of cattle,
tuberculosis, once introduced, makes rapid and extensive ravages.
Conversely overfeeding often acts in the same way, developing
indigestion and thereby robbing the tissues of their proper nourishment.