Stress is a normal part of everyday life. Some stress is
good for us, some stress can be harmful. But chronic, long-term stress has been
called toxic stress because it can lead to self-destructive eating behaviours.
Toxic stress puts fat on and can lead to disease.
When a threatening event takes place, our bodies are
purpose-built to act on that event. Our entire being from tissues, blood cells,
brain chemicals and hormones pump messages to our heart, lungs, and limbs. Our
stress response was designed to protect us from danger. However, we live in a
much less dangerous world than our ancestors did. As we became less physical,
we got smarter. We substituted intellectual stresses for physical ones. But our
bodies are still wired for some sort of physical response. Fight or flight.
Our bodies are built to move, to balance thought and action.
So when we don’t have a physical release, stress accumulates and may become
toxic.
Here’s what happens: when the brain first registers a
stressful event, it releases a chemical known as corticotropin-releasing
hormone (CRH); it raises the alarm. There is a baseline of this hormone in our
body, and it can be elevated by anything that stimulates your senses: fear,
excitement, passion, panic, anxiety, happiness, or joy. Once the alarm is
triggered, a cascade of neurochemical sparks, designed to prepare the body for
fight or flight, kicks in.
The alarm hormone also activates the adrenals, two glands
located in the abdomen, and tells them to secrete two substances: adrenaline
and cortisol. Cortisol is known in the scientific literature as glucocorticoid,
because of its ability to stimulate glucose elevations in the blood and because
it is secreted by the outer part of the adrenal gland called the cortex.
CRH (the alarm hormone), cortisol and adrenaline follow a
distinct rhythm of secretion throughout the day. These stress hormones tend to
peak between 6 and 8 a.m. and begin a gradual decline later in the morning
reaching their lowest levels at night. By about 2 a.m., the levels begin to
rise again, preparing you for the morning to help you cope with the next day’s
stresses.
The body reacts to a stressful event within seconds of it
happening. The body goes into code red: pupils dilate, blood pressure rises,
thinking and memory improve, and lungs take in more oxygen. Digestion is put on
hold, allowing the body to concentrate its energy on the muscles needed for the
physical stress response. Immune function is momentarily suppressed for the
same reason. Physical sensation of pain is dulled to minimize distraction and
focus more attention on the coping mechanism. All systems are on high alert.
In addition to these physical responses, the alarm hormone
activates the reward and pain relief areas of the brain. Most physiological
functions in the human body involve stressing the body’s systems in a healthy
way. This includes digestion and metabolism. This concept of reward helps to
explain what can go right as well as what can go wrong in some people’s eating
patterns under stress.
The fight or flight response is ideal for situations that
require you to defend yourself or cope with daily stresses that require
physical strength and endurance. This
response is designed to get you moving away from danger. Cortisol grabs
high-octane fat and energy-propelling glucose from the body’s stores, diverts
blood away from internal organs, and directs them to your brain, heart, lungs,
and muscles for immediate energy.
Once the immediate “danger” is over the adrenaline level in
the bloodstream rapidly decreases. Cortisol, on the other hand, lingers in the
system and is designed to help bring the body back into a balanced state. The
behavioral and physical adaptations to stress reverse, and the body returns to
its normal state.
But what if one is under chronic stress? You can clearly see
how this could lead to disease because the body will keep secreting stress
hormones until a critical threshold is reached. When that happens, the body, being
constantly primed for action, is bathed in waves of these hormones and it never gets a chance to return to homeostatis (balance). And this is when health
begins to break down.