" It has long been known that stress, especially early in life, alters brain structure. For instance, studies both in animals and in humans have shown that early stress increases the size of the amygdalae. One study found that an eight-week program of mindfulness meditation reduced the volume of the right basolateral amygdala, and these changes were correlated with a subjective decrease in stress. "

― Sam Harris , Waking Up: A Guide to Spirituality Without Religion