Epinephrine and norepinephrine are fight-or-flight hormones, often called adrenalin and noradrenalin, or collectively, “catecholamines”. They are released from the adrenal glands during periods of stress; including times when food is absent (such as fasting) and during intense exercise. When they are released into the blood stream, the catecholamines trigger the release of glucose from energy stores, and increase fat burning. They also make you feel awake and alert.
