Answer:
stress effects
Step-by-step explanation:
Chronic stress has a shrinking effect on the prefrontal cortex, the area of the brain responsible for memory and learning. While stress can shrink the prefrontal cortex, it can increase the size of the amygdala, which can make the brain more receptive to stress.Researchers at the Centers for Disease Control and Prevention (CDC) found that abnormally low concentrations of the hormone cortisol in the morning could correlate with more severe fatigue in patients with chronic fatigue syndrome (CFS).