The body's stress response runs through the HPA axis — hypothalamus → pituitary → adrenal glands → cortisol — and sustaining it burns through specific nutrients fast. Vitamin C and vitamin B5 (pantothenic acid) are concentrated in the adrenal glands and consumed in the making of cortisol; magnesium is depleted by stress, and its depletion in turn amplifies the stress response — a self-reinforcing loop. L-theanine, glycine, and taurine supply the calming, inhibitory side that lets the system stand back down. Chronic stress without these inputs leaves the axis dysregulated: wired-but-tired, poor sleep, blunted recovery. These 48 whole foods are ranked by how many of the key stress nutrients a typical serving delivers (≥10% DV each).