Chronic stress increases the stress hormone cortisol, affecting brain function and putting you at risk for various mood disorders and other mental issues.
Stress is a modern epidemic.
The human body is not designed to be in a state of perpetual stress and continue to stay healthy.
An alarming 90% of doctor visits are for stress-related health complaints. (1)
Stress not only makes you more vulnerable to everything from cancer to the common cold, it also negatively impacts your brain. (2)
The Dangers of Stress and Excess Cortisol
There are two main kinds of stress — acute stress and chronic stress — and, despite what you might think, not all stress is bad for you.
Acute stress is the reaction to an immediate threat, commonly known as the “fight or flight” response.
Once the threat has passed, your levels of stress hormones return to normal with no long-lasting effects.
Some degree of acute stress is even considered desirable as it primes your brain for peak performance. (3)
Epinephrine (also known as adrenaline) and norepinephrine are stress hormones produced on an as-needed basis in moments of extreme arousal.
They help you think and move fast in an emergency.
In the right situation, they can save your life.
They don’t linger in the body, dissipating as quickly as they were created.
Cortisol, on the other hand, streams through your system all day long, and that’s what makes it dangerous.
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This stress hormone has been called “public enemy #1.” (4)
Cortisol also takes an equally high toll on your mental health by changing the structure and function of your brain.
12 Ways Stress Negatively Affects Your Brain
Some brain-related stress symptoms, like memory loss, brain fog, anxiety, and worry, will be obvious to you.
But most of the effects of stress discussed below are “behind the scenes.”
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When stress becomes chronic, it changes your brain down to the level of your DNA. (8)
You won’t notice these changes while they’re happening, but you will notice the side effects … eventually.
1. Stress Creates Free Radicals That Kill Brain Cells
Cortisol creates a surplus of the neurotransmitter glutamate. (9)
While glutamate is a necessary and important brain chemical, in excess it turns against your brain and becomes a neurotoxin.
Glutamate creates free radicals — unattached oxygen molecules — that attack brain cells in much the same way that oxygen attacks metal, causing it to rust. (10)
Free radicals actually punch holes in brain cell walls, causing them to rupture and die.
Stress also indirectly contributes to other lifestyle habits that create more free radicals.
If stress causes you to lose sleep, eat junk food, drink too much alcohol, or smoke cigarettes to cope, know that these unhealthy habits are adding to your free radical load.
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2. Stress Makes You Forgetful and Emotional
Memory problems may be one of the first signs of stress that you’ll notice. (11)
Misplaced keys and forgotten appointments have you scrambling, further adding to your stress.
If you find that all this stress is making you more emotional too, there’s a physiological reason for this.
Studies show that when you’re stressed, electrical signals in the brain associated with factual memories weaken, while areas in the brain associated with emotions strengthen. (12)
3. Stress Creates a Vicious Cycle of Fear and Anxiety
Stress actually fortifies an area of your brain called the amygdala.
This is your brain’s fear center.
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Stress increases the size, activity level, and number of neural connections in this part of the brain.
This makes you more fearful, causing a vicious cycle of even more fear and stress. (13)
4. Stress Halts the Production of New Brain Cells
Every day you lose brain cells, but every day also you have the opportunity to create new ones.
Brain-derived neurotrophic factor (BDNF) is a protein that’s integral in keeping existing brain cells healthy and in stimulating new brain cell formation.
It’s often likened to fertilizer for the brain.
BDNF can offset the negative effects of stress on the brain. (14)
But cortisol halts the production of BDNF, resulting in fewer new brain cells being formed. (15)
Lowered levels of BDNF are associated with brain-related conditions including depression, obsessive-compulsive disorder, schizophrenia, dementia, and Alzheimer’s disease. (16)
5. Stress Depletes Critical Neurotransmitters
Your brain cells communicate via chemicals called neurotransmitters.
Low levels of either of these neurotransmitters can leave you depressed and more prone to addictions.
Serotonin is dubbed the “happy molecule.”
It plays a large role in mood, learning, appetite control, and sleep.
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Dopamine is known as the “motivation molecule.”
It’s in charge of your pleasure-reward system.
Too little dopamine can leave you unfocused, unmotivated, lethargic, and depressed.
People low in this brain chemical often use caffeine, sugar, alcohol, and illicit drugs to temporarily boost their dopamine levels.
Serotonin-based depression is characterized by anxiety and irritability, while dopamine-based depression expresses itself as lethargy and lack of enjoyment of life. (24)
6. Stress Puts You at Greater Risk for Mental Illnesses of All Kinds
Recent research has discovered physical differences in the brains of people with stress disorders. (25)
Chronic stress puts you at increased risk for developing a variety of mental illnesses, including anxiety and panic disorders, depression, PTSD, schizophrenia, bipolar disorder, drug addiction, and alcoholism. (26, 27, 28)
7. Stress Makes You Stupid
Stress can cause your brain to seize up at the worst possible times — exams, job interviews, and public speaking come to mind. (29)
This is actually a survival mechanism.
If you’re faced with a life and death situation, instinct and subconscious impulse overwhelm rational thought and reasoning.
This might keep you from being killed in an encounter with a tiger, but, in modern life, this is rarely helpful.
It negatively impacts virtually every cognitive skill you rely on to get through the day, including your ability to pay attention, remember, solve problems, make decisions, and think critically.
8. Stress Shrinks Your Brain
Stress can measurably shrink your brain.
Cortisol can kill, shrink, and stop the generation of new neurons in the hippocampus, the part of your brain that stores memories. (32)
Stress also shrinks the prefrontal cortex.
This negatively affects decision making, working memory, and impulse control. (35)
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9. Stress Lets Toxins into Your Brain
Your brain is highly sensitive to toxins of every kind.
The blood-brain barrier is a group of highly specialized cells that act as your brain’s gatekeeper.
This semi-permeable filter protects the brain from harmful substances, while letting needed nutrients into the brain.
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Stress makes the blood-brain barrier more permeable, in effect making it leaky. (36)
This lets substances into the brain that you don’t want there — pathogens, heavy metals, chemicals, and neurotoxins of all kinds.
Clearly, this is not desirable.
10. Stress Increases Your Risk of Dementia and Alzheimer’s
One of the most worrying effects of stress on the brain is that it increases your risk for dementia and Alzheimer’s.
Being diagnosed with Alzheimer’s disease is now the #1 health fear of American adults.
Alzheimer’s is also the sixth leading cause of death.
One in three US seniors will die with Alzheimer’s or other forms of dementia.
And it’s the most expensive disease in the country. (37)
There is no simple “magic bullet” to prevent Alzheimer’s.
Common sense advice includes eating a healthy diet low in sugar and high in brain-healthy fats, getting physical exercise, not smoking, staying mentally active, avoiding toxic metal exposure, and minimizing stress. (38, 39)
It’s been found that stress, particularly stress that occurs in midlife, increases your risk of Alzheimer’s.
Mid-life occurrence of anxiety, jealousy, and moodiness doubles your risk of developing Alzheimer’s. (40)
Chronic stress and elevated cortisol contributes to dementia in the elderly and hastens its progression. (41)
11. Stress Causes Brain Cells to Commit Suicide
Stress leads to premature aging on a cellular level, causing cells in both your body and your brain to commit suicide prematurely.
To understand how this happens, we need to take a look at a part of your chromosomes called telomeres.
You may recall from high school biology that when a cell divides, it passes on the genetic material to the new cell via chromosomes.
Telomeres are protective endcaps on our chromosomes similar to the plastic tips on shoelaces.
Every time a cell divides, the telomeres get a little shorter.
When they reach a critically shortened length, they tell the cell to stop dividing, acting as a built-in suicide switch.
Subsequently, the cell dies.
Shortened telomeres lead to the atrophy of brain cells, while longer telomere length leads to the production of new brain cells. (42)
Telomere length may be the most important indicator of biological age and disease risk. (43)
Some researchers believe it’s a better predictor of your risk for age-related diseases like Alzheimer’s, heart disease, diabetes, and cancer than conventional diagnostic tools.
12. Stress Contributes to Brain Inflammation and Depression
A little-known fact is that the brain has its own immune system.
Special immune cells called microglia protect the brain and spinal cord from infections and toxins.
Unfortunately, a microglial cell has no on or off switch, so once it is activated, it creates inflammation for the rest of its lifespan.
Chronic stress is one of the factors that increases the risk of activating your microglia, thus producing brain inflammation.
It’s generally believed that depression is caused by serotonin deficiency, but there’s a growing body of evidence that brain inflammation may be the root cause of depression instead.
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This theory is called the “cytokine model of depression.”
Cytokine production is linked to depression, including major depressive disorder and increased thoughts of suicide. (46)
How Stress Destroys Happiness
On top of all that …
Stress destroys your happiness and peace of mind.
It wears you down mentally and emotionally and saps the joy from life.
Some side effects of stress that negatively impact your overall mental outlook include:
- excessive worry and fear
- anger and frustration
- impatience with self and others
- mood swings, crying spells, or suicidal thoughts
- insomnia, nightmares, disturbing dreams
- trouble concentrating and learning new information
- racing thoughts and nervousness
- forgetfulness and mental confusion
- difficulty in making decisions
- feeling overwhelmed
- irritability and overreaction to petty annoyances
- excessive defensiveness or suspicion
- increased smoking, alcohol or drug use, gambling, or impulse buying
In short, chronic stress leads to a bleak mental health outcome.
But there is plenty you can do to reduce or eliminate stress from your life.
6 Simple Steps to Protect Your Brain from Stress
Stress is an unavoidable part of life, but minimizing stress and protecting your brain against its effects is easier than you might think.
6 Lifestyle Habits to Overcome the Harmful Effect of Stress on Your Brain
Eat antioxidant-rich foods
Stop free radical damage by eating a diet high in antioxidant-rich foods like fruits, vegetables, dark chocolate, and green tea.
Increase levels of brain-boosting BDNF by getting daily physical exercise.
Exercise doesn’t have to be strenuous. Walking is excellent.
So are exercises with a strong mind-body connection like yoga, tai chi, and qi gong.
Start a daily meditation practice.
Meditation not only reduces stress, it’s also a proven way to keep your brain young by keeping telomeres long. (49)
Meditation is also the best tool for learning how to master your thoughts.
Stress does not come from events in your life as much as it comes from your thoughts — your automatic negative reactions and cognitive distortions — about these events.
Use a relaxation technique
Try one of the many mind-body relaxation techniques such as self-hypnosis, biofeedback, or autogenic training.
Try an adaptogenic herbal remedy
Consider taking an adaptogenic herbal remedy.
Adaptogens increase your resilience to stress, while supporting overall health.
They promote a balance between feeling energetic and feeling calm.
Top adaptogens to consider include ashwagandha, ginseng, holy basil, Arctic root, and bacopa.
Get high-quality sleep
Get plenty of restful sleep.
Effects of Stress on the Brain: Take the Next Step
Stress takes a high toll on mental health and affects your brain structure and function in very real ways.
It hastens brain aging, depletes beneficial brain chemicals, enlarges your brain’s fear center, and can stop the production of new brain cells.
It increases your risk of psychiatric and neurodegenerative diseases.
And frustratingly, it decreases mental functions of all kinds, leaving you less able to cope with daily life.
Fortunately, there is much you can do to reduce or stop the traumatic effects of stress — eat right, exercise, get adequate sleep, and employ proven relaxation techniques.
Additionally, you can try one or more stress-busting adaptogenic herbs.
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