Stress and cortisol
Cortisol is one of the stress hormones, produced in the adrenal glands and controlled by ACTH released by hypophysis. Cortisol contributes to save your life in case of danger. It has an important role in carbohydrates metabolism, increasing glucose synthesis, source of energy in the whole body.
It also contributes to maintain your energy balance during all day.
Unfortunately our organism does not really make difference during different stress situations. He not only produces cortisol during dangerous situations but he also does it when you are stressed at work, when you are blocked into traffic jam. This leads to unnecessary high levels of cortisol.