In "why soldiers won't talk" by John Steinbeck

From the text:

The ductless glands pour their fluids into the system to make it able to stand up to the great demand on it. Fear and ferocity are products of the same fluid. Fatigue toxins poison the system. Hunger followed by wolfed food distorts the metabolic pattern already distorted by the adrenaline and fatigue. The body and the mind so disturbed are really ill and fevered.