20 Proven Ways to Quickly Lower Your Cortisol Levels

20-proven-ways-to-effectively-lower-your-stress-hormone-reduce-counteract-manage-cortisol-decrease-levels-for-brain-mental-health-anxiety-depression-cognitive-function-foods-nutrients-herbs-supplements adaptogens-adrenals-naturally-science-tips

Chronic stress is killer. 

It broke me down over the years and led me to deep depression.

Getting a handle on it has been critical to my recovery. 

But it took me a while to figure out what works.

And I’d rather not see other people struggle and frantically look for solutions.

So I’ve gathered some of my favourite solutions here for you.

But before we get to them, let’s quickly discuss your body’s main stress hormone – cortisol – and how chronically high levels of it can negatively affect your brain and mental health. 

How Stress and Cortisol Affect Your Brain

Cortisol is known as the “stress hormone”.

It’s a naturally-occurring steroid hormone that’s produced by your adrenal glands and released when you’re under physical or mental stress. Essentially, it triggers our fight-or-flight response in stressful situations.

But it’s also absolutely necessary for our health, as it plays a key role in many different bodily processes. 

Cortisol levels are generally highest in the morning and lowest at night. But problems can arise when they are elevated for prolonged periods of time (134). 

Chronically high cortisol levels can:

  • Change the size, structure and functioning of your brain;

  • Shrink and kill brain cells;

  • Cause premature aging in the brain;

  • Contribute to memory loss and lack of concentration;

  • Slow down our ability to grow new brain cells; and

  • Increase inflammation in the brain (135-140).

Watch this TED-Ed video, “How Stress and Cortisol Affect Your Brain,” to learn more: 

Chronic stress and high levels of cortisol also increase activity in the amygdala, the fear centre of the brain. This can create a vicious cycle in which the brain is more likely be get stuck in a constant state of fight-or-flight.

When I did neurofeedback, my practitioner discovered my amygdala was overactive. She trained it back down to normal levels, and my chronic anxiety dissipated. 

Anxiety isn’t the only mental condition linked to an abnormal stress response. Here are some others:

  • Major depressive disorder;

  • Bipolar disorder;

  • Borderline personality disorder;

  • Insomnia;

  • ADHD;

  • Anorexia;

  • Bulimia;

  • Alcoholism; and

  • Dementia and cognitive impairment (135-150).

Luckily, there are a number of ways to manage and overcome chronic stress, lower cortisol levels, reverse damage done to the brain, and improve your sense of wellbeing. 

Let’s go through them.  

1. Laugh

In the book The Anatomy of an Illness as Perceived by the Patient, Norman Cousins explains how he cured himself of ankylosing spondylitis by laughing along with Marx Brothers movies.

I made the joyous discovery that ten minutes of genuine belly laughter had an anesthetic effect and would give me at least two hours of pain-free sleep. When the pain-killing effect of the laughter wore off, we would switch on the motion picture projector again and not infrequently, it would lead to another pain-free interval.
— Norman Cousins

It sounds farfetched, but more and more research is showing that laughter has a powerful effect on our health. 

Researchers have found that laughing and having fun significantly reduces stress hormone levels (65, 66). 

In one study, laughter improved the short-term memory of older adults, and simply anticipating humour decreased their cortisol levels by nearly 50% (64). 

So, next time you’re stressed, try watching a funny TV show or YouTube video

2. Eat Dark Chocolate

Most people know that dark chocolate is rich in multiple antioxidants, such as flavonols and polyphenols, which reduce oxidative stress.

But it also reduces cortisol. 

This may explain why people love to eat chocolate and experience relaxation when they do. 

And as I’ve mentioned before, dark chocolate can protect your brain by boosting your brain’s growth hormone

You should always try to get raw dark chocolate with the least amount of sugar like this one.

3. Play with Animals

  This is my cat named Puddy. He's annoying but he does reduce my cortisol levels.

This is my cat named Puddy. He's annoying but he does reduce my cortisol levels.

Petting your own dog or another person’s dog has been shown to significant decrease stress hormone levels and increase oxytocin, endorphins, and other healing hormones (71, 73). 

Researchers have also compared 20 minutes of quiet rest to 20 minutes of interaction with a dog, and they found that hanging out with dog contributed to a much more significant decrease in cortisol. This is often why therapy dogs show up on college campuses during exams (71). 

So you should try to hang out with animals as much as possible, and consider getting a house pet if you don’t have one. I have a cat named Puddy. 

Spending time in nature has also been shown to reduce cortisol levels. So you can kill two birds with one stone by taking your pet for a walk in the park (77). 

Hmm perhaps “kill two birds with one stone” wasn’t the best idiom to use in this section, but you get my point. 

4. Listen to Music and Dance

Music is actually healing and can have a calming effect on the brain. 

Numerous studies show that music can relax you, especially before a stressful event, by significantly lowering stress hormones. It can also reduce the spike in cortisol during the stressful situation (50-54). 

Music can be even more relaxing when combined with non-strenuous dancing.

Regular dancing has also been shown to greatly decrease cortisol levels (55). 

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5. Drink Tea

Several different types of tea have beneficial effects on cortisol levels. 

Green tea has been shown to inhibit the synthesis of cortisol (18). 

And a study found that individuals who drank 4 cups of black tea daily for six weeks had lower cortisol levels in comparison to others who didn’t drink black tea (2). 

Researchers couldn’t confirm what caused this reduction in cortisol, but they suspected it had something to do with the high content of theanine, an amino acid found in both black and green tea.

A follow-up study published this year confirmed that theanine can reduce cortisol (13).

Theanine produces a calming effect on the brain by crossing the blood-brain barrier and increasing the production of both GABA and dopamine in the brain (12). 

I personally can’t drink most teas because they tend to contain mycotoxins (mold toxins) and I’m very sensitive to them after living in a moldy home.

If you’ve lived in a moldy home or have found out that you’re genetically susceptible to mycotoxins, you can supplement with straight theanine like I do. 

This supplement includes theanine. 

And if you do decide to drink black tea, you can lower cortisol even more by getting decaffeinated black tea.

Lastly, chamomile tea is another tea that can decrease cortisol. It’s been used for centuries as a sleep aid. It contains flavonoids, essential oils, coumarin and other compounds that can help you relax.

Several studies show it can block the precursor hormone of cortisol and improve sleep quality (14, 15). 

This anti-anxiety supplement includes both theanine and chamomile, along with a number of other natural compounds that have helped me manage my stress and anxiety over the years. You can use the coupon code FIVE$45496275 for a 5% discount.

6. Eat Extra Virgin Olive Oil

Olive oil has numerous health benefits, particularly because of its strong anti-inflammatory effects.

It also contains a compound called oleuropein, which can reduce cortisol levels (37). 

I add it to my salads and sometimes even just take a tablespoon of it straight.

Be careful though. A lot of cheap extra virgin olive oil in grocery stores are not actually “extra virgin.”

Investigations have found that there is a lot of fraud within the olive oil industry and many so-called extra virgin olive oils contains other cheaper, refined vegetable oils, such as soybean, corn and canola. 

This is discussed more in the book Extra Virginity: The Sublime and Scandalous World of Olive Oil

7. Practice Relaxation Techniques and Therapies

Not too surprisingly, simply taking time each day to relax can lower cortisol.  My favourite relaxation technique is meditation. 

Countless studies show that meditating daily for just 15 minutes can significantly lower stress hormone levels and blunts cortisol spikes (38-43). 

I use the Muse headband to meditate. Similar to neurofeedback, it gives you real-time feedback on your brainwaves. I previously wrote about it here, and you can get it through Amazon or the Muse website

Yoga has also been shown to lower cortisol. 

In one study, people with depression practiced yoga regularly for 3 months. By the end of the study, their cortisol levels dropped significantly and they experienced relief from their depression (44). 

Massage is another excellent option, as it’s been shown in many studies to significant decrease in cortisol and anxiety (45, 46). 

I get a massage every couple of months. 

Emotional Freedom Technique, or “tapping”, is another tool I use to manage stress. 

Tapping is based on ancient Chinese acupressure and modern psychology. You can learn how to practice it here

I know it seems hokey, but it works. 

It’s been shown to significantly decrease cortisol levels (47). 

The book The Tapping Solution: A Revolutionary System for Stress-Free Living goes in more depth about the practice. 

Lastly, deep breathing exercises can help you manage your stress hormone levels. 

Diaphragmatic breathing – consciously breathing from your diaphragm – has been shown to encourage the body’s natural relaxation response and reduce cortisol (48, 49). 

I use the EmWave2 device every day to reduce stress and make sure I’m breathing optimally. I wrote about it before here.

8. Exercise (But Not Too Much)

Exercise is definitely good for you. It can balance hormones and reduce stress by releasing endorphins. However, overtraining can actually backfire and increase stress hormone levels (112). 

That’s why I don’t really recommend chronic endurance exercise and prefer weightlifting and high-intensity sprinting over cardio. 

Research shows that prolonged aerobic exercise can increase cortisol levels, and marathon runners have higher levels of cortisol (111, 113). 

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9. Get More Deep Sleep

This might be the most important step. 

Getting enough high-quality sleep is critical for the health of your brain. 

My sleep used to be terrible and it was one of main factors that contributed to my poor mental health. And then my poor mental health would make my sleep worse. So it was a vicious cycle. 

Let me explain.

Normally, cortisol increases in the morning and then drops very low at night prior to bed. But if you have chronic stress and high cortisol, you can end up feeling wired and anxious at night, making it more difficult to sleep. 

Unfortunately, staying up late when your body expects to be asleep further increases your stress hormone levels even more. And lack of sleep and interrupted sleep have been shown to significantly increase cortisol throughout the next day and contribute to cognitive problems down the road (56-61, 63). 

So it’s clearly a vicious cycle where high cortisol causes sleep problems, and poor sleep increases stress.  

That’s why it’s so important go to bed at the same time every night and aim for at least 7 hours of sleep every night. Without doing that, you can end up with dysregulated daytime cortisol production.

And it’s not just the amount of sleep you get that’s important. It’s also the quality of sleep. In fact, the quality of your sleep is more important than the length of your sleep.

So I would try doing everything you can to maximize the quality of your sleep. 

Here are some things that I do:

You can also take this sleep supplement, which contains magnesium and a number of other natural compounds that I’ve used over the years to promote the production of melatonin. You can use the coupon code FIVE$45496275 for a 5% discount.

And if you don’t get enough sleep one night, try to take a nap sometime the next day. Daytime napping after a night of sleep loss has been shown to cause beneficial changes in cortisol levels (62).

10. Chew Aspartame-Free Gum

Next time you’re stressed, try chewing a piece of gum

It’s an easy way to lower your stress hormone levels. 

According to one study, chewing gum while under moderate stress reduces mental stress and decreases cortisol by 12 per cent. Previous studies have also shown that chewing can increase alertness, neural activity and blood flow to the brain (82). 

I prefer if the gum is aspartame-free, like this one.

11. Take Cortisol-Reducing Nutrients and Herbs

There are a number of vitamins, minerals and adaptogenic herbs that have been shown to reduce stress and cortisol levels. 

I’ll go over some of my favourites here.

Phosphatidylserine is probably the best option for reducing stress hormone levels. 

Phosphatidylserine is a fat-soluble amino acid compound that plays a key role in optimal cognitive function. High amounts of phosphatidylserine can be found within the brain, and supplementation has been shown to improve attention and memory, especially in the elderly (114-116). 

…consumption of phosphatidylserine may reduce the risk of dementia and cognitive dysfunction in the elderly.
— Food and Drug Administration

On top of all this, phosphatidylserine powerfully lowers cortisol (117-119). 

People who supplement with phosphatidylserine have also been shown to have lower average levels of cortisol (120).

I take phosphatidylserine every day. It's part of the Optimal Brain supplement. You can get it here, and Amazon also now carries it.

Ashwagandha is another great cortisol-reducing supplement. It’s a popular Indian herb commonly used to prevent anxiety. As I’ve discussed before, its anti-anxiety effect is synergistic with alcohol.

Its stress-reducing effects are likely because it lowers stress hormone levels. 

Multiple studies have concluded that it is a potent stress reliever that can reduce cortisol by anywhere from 14 to 32% (121-123). 

Another adaptogenic herb that can lower cortisol is rhodiola

I’ve discussed rhodiola before in depth. It can really help with symptoms of depression. 

Research has found that it may be doing this by significantly reducing stress hormone levels in the body (124-126). 

Lastly, a number of minerals have been shown to reduce cortisol, including zinc, magnesium and selenium (96, 97, 127-133).

That’s why I take and recommend this multi-mineral supplement every day. 

Overall, ashwagandha, rhodiola, phosphatidylserine and minerals are my favourite ways to keep stress levels low, but there are plenty of other supplements that have been shown to positively affect cortisol levels, including:

12. Consume Enough Food, Protein and Water

Eating enough protein and calories, and drinking enough clean, filtered water is also critical to keeping stress hormone levels low.  

Studies show that severely restricting calories elevates cortisol levels (108, 109). 

Restricting protein and depriving yourself of the amino acid leucine can also stimulate the stress response and increase stress hormones (110). 

That’s why I eat plenty of food each day and supplement with creatine and BCAA protein powder throughout the day when I don’t have access to a source of high-quality protein. 

Lastly, make sure you stay hydrated and drink plenty of water.

Properly-hydrated runners have noticeably lower cortisol levels than dehydrated runners (81)

I use this Berkey system to filter my water so that it’s as pure as possible. 

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13. Stand Tall

Changing your body language can have a powerful effect on your biology. 

Standing tall for just two minutes can lower your cortisol by 25 per cent, according to a famous study led by Harvard social psychologist Amy Cuddy (83). 

Cuddy’s research found that if you switch from low-power body language (arms crossed, hunched over, closed up, slumped shoulders, nervous) to high-power body language (opened up, tall, relaxed, confident), your hormones will change to match your new posture (84). 

So try your best to maintain high-power body language as much as possible as it can reduce stress hormones and increase confidence. You could even try holding a dominant pose for 2 minutes every day. You’ll likely find yourself feeling calmer and more mentally powerful.

And if you haven’t already, check out Amy Cuddy’s TED talk “Your Body Language Shapes Who You Are”.

I also recommend her book Presence: Bringing Your Boldest Self to Your Biggest Challenges.

14. Socialize

Social connectivity and positive social interactions also significantly reduce stress hormone levels.

Research shows that the more social support a person has, the lower their cortisol levels will be (67). 

This is likely because you release the hormone oxytocin during social contact and social bonding, and oxytocin has been proven to decrease anxiety and block increases in cortisol (68). 

One study states that “the combination of oxytocin and social support exhibited the lowest cortisol concentrations as well as increased calmness during stress” (69). 

Animal studies have also discovered that social isolation leads to higher cortisol and mental health problems (70). 

Make sure to check out my full article about oxytocin

15. Consume More Omega-3s and Less Omega-6s

As I’ve discussed before, omega-3s are dietary fats that are needed for the proper functioning of your brain and nervous system. They improve learning and memory, and protect against psychiatric disorders including depression, mild cognitive impairment, dementia and Alzheimer's disease (4-7). 

Researchers have also found that when individuals supplement with omega-3 fatty acids, there is a significant reduction in the release of cortisol (1, 10).

Omega-3 fatty acids also significantly reduce stress hormones in animals (3). 

Krill oil is my favourite source of omega-3 fatty acids. I take this one everyday. You can get it here or here. 

I also eat wild salmon and grass-fed beef on a regular basis. 

On the other hand, consuming too many omega-6 fatty acids have been linked to an increase inflammation and cortisol (8, 9, 11).

So make sure to avoid refined vegetable oils including soybean, corn, safflower, sunflower, and canola.

16. Get Enough Antioxidants

Not only do antioxidants counteract oxidative stress within the body; they can also help reduce cortisol (19, 25). 

Most of the research has been done in athletes, but supplementation with antioxidants – such as berry powders, greens powders, vitamin C, glutathione and CoQ10 – leads to fairly significant reductions in cortisol and other measures of stress (20-23). 

Dark berries in particular contain antochyanins, which have been shown to lower cortisol (24). 

Acai berries are my favourite, as they are loaded with antochyanins and vitamin C.

Regarding vitamin C, the research is mixed on whether it can consistently lower cortisol levels.

However, in my experience, high doses of vitamin C definitely reduce stress.

This study found that a high dose of vitamin C decreases anxiety and improves mood (29). 

After exercise, it’s also been shown to rapidly reduce cortisol (26, 27). 

And multiple other studies have found that both vitamin C and vitamin E reduce cortisol and anxiety (30-32). 

It’s also well known that chronic stress and high cortisol can deplete vitamin C and other antioxidant enzymes (28). 

In addition to getting vitamin C from fruits and vegetables, I take at least 500 mg of supplemental Vitamin C every day. I’ve experimented with taking up to 10 grams daily (2 gram doses throughout the day) and it helped me manage stress, but it’s not necessary unless you find it really helps you. 

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17. Take Curcumin

Curcumin is the most heavily researched compound within turmeric, the spice that gives curry its yellow colour.

Curcumin is one of my favourite compounds. I discussed it previously in “3 Foods That Make Your Brain Work Remarkably Better”.

Thousands of high-quality scientific studies have been published, showing that curcumin has anti-inflammatory and antioxidant effects and can increase your brain’s growth hormone. 

Research shows that curcumin inhibits the increase in cortisol caused by stress (33, 34). 

And animal studies have found that curcumin may reverse elevated cortisol levels after chronic stress (35, 36). 

Unfortunately, curcumin is very inefficient at absorbing into the bloodstream and reaching the brain (54, 55).

Luckily, science and technology has been able to concentrate significant amounts of curcumin into supplement form and increase its bioavailability. 

There are several different patented forms of “bioavailable” curcumin and I've tried most of them. 

My favourite is the "Longvida" form of curcumin, as I noticed a significant effect from it. You can get it through Amazon. It is one of my favourite supplements and since it is a fat soluble, I take it every day with a fatty meal.

18. Eat Prebiotic Foods

Prebiotics are substances in food that humans can't digest, so they pass through our gastrointestinal tract and promote the growth of many different strains of good bacteria in our lower bowel. They are essentially food for the probiotics in our intestines.

Dr. Phil Burnet, a neurobiologist at Oxford University, published a paper in 2015 showing that people who ingested prebiotics have lower levels of cortisol and focused more on positive feedback and less on negative stimuli. He said the results were very similar to when people take anti-depressants and anti-anxiety medication, but without the side effects (87).

That’s why I eat prebiotic-rich foods regularly, including sweet potatoes, carrots, onions, asparagus and squash. These foods are included in my free grocery shopping guide for optimal brain health. 

Resistant starch is one of the most potent ways to boost your prebiotic intake. A convenient way to incorporate more of it into your diet is by using Bob’s Red Mill Unmodified Potato Starch. Other high-quality resistant starches include banana flour, plantain flour and waxy maize. Cooked and cooled white rice and potatoes also contain some resistant starch. 

I previously discussed prebiotics and resistant starch in “5 Ways to Increase Your Good Gut Bacteria for A Healthier Brain.

I also created and take the Optimal Biotics supplement to reduce stress and support my mental health. 

19. Limit Alcohol and Caffeine

Excess consumption of alcohol and caffeine have been shown to increase stress hormones, so their consumption should be limited. 

Coffee is definitely good for brain health. There is a lot of research showing it is very healthy and can be protective against dementia. 

However, it can also disrupt sleep and make people anxious. I used to not be able to handle any coffee at all. But now that I'm healthy, I can handle it just fine. I drink one cup of Kicking Horse coffee most mornings.  

But if you’re struggling with high cortisol and chronic stress, I wouldn’t recommend high doses of caffeine.

It’s been shown to directly stimulate the adrenal cortex, release cortisol into the bloodstream and increase stress hormone levels (74-76).

One study found that caffeine increased cortisol by 30% in just one hour, and regular consumption can double your cortisol levels (88, 89). 

So limit it as much as possible.

An alternative solution is to consume the whole coffee fruit, instead of drinking coffee.

The coffee fruit contains several healthy compounds not found in coffee beans themselves.

And after years of careful clinical research, scientists have discovered that ingesting whole coffee fruit concentrate significantly increases brain function. Coffee fruit concentrate can be found in the Optimal Brain supplement. You can get it here, and Amazon also now carries it.

Lastly, excess alcohol consumption over an extended period of time has also been shown to raise cortisol levels. Having a couple drinks here and there likely isn’t a problem though, and you can protect yourself from it by following these steps (90, 91). 

20. Other Cutting-Edge Therapies

Here are some other therapies that have been shown to reduce stress and cortisol:

  • Bright Light Therapy (85, 86) – I recommend this device.

  • Transcranial direct current stimulation (78)

  • Transcranial magnetic stimulation (79, 80)

  • Acupuncture (92) – I use this acupressure mat.

 

Conclusion

It’s important to take control of your stress before it takes control over you.

Thankfully, there are so many ways to manage your stress and lower cortisol levels without having to resort to a prescription. 

Here’s a summary of everything we’ve gone over to reduce stress hormone levels:

20-proven-ways-to-effectively-lower-your-stress-hormone-reduce-counteract-manage-cortisol-decrease-levels-for-brain-mental-health-anxiety-depression-cognitive-function-foods-nutrients-herbs-supplements adaptogens-adrenals-naturally-science-tips

I remember when I first discovered all of these tools and strategies, it gave me so much hope that I could get better and heal without drugs.

And I thankfully I did.

And you can too. 

Let me know what you think in the comments. Have you ever had high cortisol? Do you have any other tips that have helped you reduce cortisol?

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Live Optimally,

Jordan Fallis

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(1) http://www.ncbi.nlm.nih.gov/pubmed/12909818

(2) http://www.ncbi.nlm.nih.gov/pubmed/17013636

(3) http://www.ncbi.nlm.nih.gov/pubmed/23208960

(4) http://ajcn.nutrition.org/content/71/1/179S.long

(5) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3618203/

(6) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC533861/

(7) http://www.ncbi.nlm.nih.gov/pubmed/12777162

(8) http://www.ncbi.nlm.nih.gov/pubmed/14579682

(9) http://www.ncbi.nlm.nih.gov/pubmed/12442909

(10) http://www.ncbi.nlm.nih.gov/pubmed/20932294

(11) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3081099/

(12) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3560823/

(13) http://www.ncbi.nlm.nih.gov/pubmed/26797633

(14) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2995283/

(15) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2995283/

(16) http://pubs.acs.org/doi/abs/10.1021/pr900607v?prevSearch=kochhar&searchHistoryKey

(17) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4350893/

(18) https://www.ncbi.nlm.nih.gov/pubmed/24404164/

(19) http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0020795

(20) http://link.springer.com/article/10.2165/11594400-000000000-00000

(21) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3761741/

(22) http://www.sciencedirect.com/science/article/pii/S0300483X03001513

(23) http://www.sciencedirect.com/science/article/pii/S0955286306002348

(24)http://www.researchgate.net/publication/227685141_Anthocyanin_Pigments_Comparison_of_Extract_Stability

(25) http://www.ncbi.nlm.nih.gov/pubmed/16042916

(26) http://www.ncbi.nlm.nih.gov/pubmed/21069377

(27) http://www.ncbi.nlm.nih.gov/pubmed/18427418

(28) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC201008/

(29) http://www.ncbi.nlm.nih.gov/pubmed/12208645

(30) http://www.ncbi.nlm.nih.gov/pubmed/21036190

(31) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3560823/

(32) http://www.ncbi.nlm.nih.gov/pubmed/21839761

(33) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2853174/

(34) http://www.ncbi.nlm.nih.gov/pubmed/20920780

(35) http://www.ncbi.nlm.nih.gov/pubmed/19540859

(36) http://www.cjpt.ac.cn/EN/abstract/abstract1590.shtml

(37) http://www.ergo-log.com/oleuropein-boosts-testosterone-lowers-cortisol-stimulates-anabolism.html

(38) http://www.ergo-log.com/meditationhormones.html

(39) http://www.ncbi.nlm.nih.gov/pubmed/23724462

(40) http://www.ncbi.nlm.nih.gov/pubmed/1801007

(41) http://www.ncbi.nlm.nih.gov/pubmed/22377965

(42) http://archinte.jamanetwork.com/article.aspx?articleid=1809754

(43) http://www.sciencedirect.com/science/article/pii/030105119505118T

(44) http://www.ncbi.nlm.nih.gov/pubmed/24049209

(45) http://www.ncbi.nlm.nih.gov/pubmed/8707483

(46) http://www.ncbi.nlm.nih.gov/pubmed/16162447

(47) http://www.ncbi.nlm.nih.gov/pubmed/22986277

(48) http://www.ncbi.nlm.nih.gov/pubmed/20617660

(49) http://www.ncbi.nl m.nih.gov/pmc/articles/PMC3573542/

(50) https://www.ncbi.nlm.nih.gov/pubmed/15086180

(51) http://www.medicalnewstoday.com/articles/258383.php

(52) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3110826/

(53) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3734071/

(54) http://medind.nic.in/jau/t10/i2/jaut10i2p70.pdf

(55) http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.403.4566&rep=rep1&type=pdf

(56) http://press.endocrine.org/doi/abs/10.1210/jcem-33-1-14

(57) http://www.ncbi.nlm.nih.gov/pubmed/9415946

(58) http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0041218

(59) https://www.hindawi.com/journals/ije/2010/759234/

(60) http://www.ncbi.nlm.nih.gov/pubmed/6822642

(61) http://www.ncbi.nlm.nih.gov/pubmed/10704520

(62) http://www.ncbi.nlm.nih.gov/pubmed/16940468

(63) http://www.ncbi.nlm.nih.gov/pubmed/15558991

(64) http://www.ncbi.nlm.nih.gov/pubmed/24682001

(65) http://www.ncbi.nlm.nih.gov/pubmed/2556917

(66) http://www.fasebj.org/cgi/content/meeting_abstract/22/1_MeetingAbstracts/946.11

(67) http://www.ncbi.nlm.nih.gov/pubmed/15473629

(68) http://www.ncbi.nlm.nih.gov/pubmed/15219651

(69) http://www.ncbi.nlm.nih.gov/pubmed/14675803

(70) https://www.psychologytoday.com/blog/the-athletes-way/201301/cortisol-why-the-stress-hormone-is-public-enemy-no-1

(71) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3408111/

(72) http://www.ncbi.nlm.nih.gov/pubmed/18221981

(73) http://www.sciencealert.com/having-a-dog-can-reduce-anxiety-and-stress-in-children-study-finds

(74) http://www.ncbi.nlm.nih.gov/pubmed/18458357

(75) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2249754/

(76) https://www.ncbi.nlm.nih.gov/pubmed/16631247

(77) http://www.ncbi.nlm.nih.gov/pubmed/19568835

(78) http://www.ncbi.nlm.nih.gov/pubmed/22626867

(79) http://www.sciencedirect.com/science/article/pii/S1000194810600044

(80) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3181968/

(81) http://www.ncbi.nlm.nih.gov/pubmed/17006802

(82) http://www.hindawi.com/journals/bmri/aa/876409

(83) http://www.people.hbs.edu/acuddy/in press, carney, cuddy, & yap, psych science.pdf

(84) http://www.ncbi.nlm.nih.gov/pubmed/20855902

(85) http://www.ncbi.nlm.nih.gov/pubmed/21199966

(86) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3686562/

(87) http://link.springer.com/article/10.1007/s00213-014-3810-0%20/fulltext.html

(88) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2257922/

(89) https://www.ncbi.nlm.nih.gov/pubmed/2195579

(90) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2266962/

(91) https://www.sciencedaily.com/releases/2010/09/100907163313.htm

(92) http://www.ncbi.nlm.nih.gov/pubmed/19765402

(93) https://www.ncbi.nlm.nih.gov/pubmed/12909818

(94) https://www.ncbi.nlm.nih.gov/pubmed/23390041

(95) https://www.ncbi.nlm.nih.gov/pubmed/23726389

(96) https://www.ncbi.nlm.nih.gov/pubmed/19554276

(97) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3560823/

(98) https://www.ncbi.nlm.nih.gov/pubmed/14737017

(99) http://www.sciencedirect.com/science/article/pii/S0304394003003008

(100) https://www.ncbi.nlm.nih.gov/pubmed/23789222

(101) https://www.ncbi.nlm.nih.gov/pubmed/23788517

(102) https://www.ncbi.nlm.nih.gov/pubmed/25141817

(103) https://www.ncbi.nlm.nih.gov/pubmed/19323371

(104) https://www.ncbi.nlm.nih.gov/pubmed/14737017

(105) https://www.ncbi.nlm.nih.gov/pubmed/11526469

(106) https://www.ncbi.nlm.nih.gov/pubmed/19865069/

(107) https://www.ncbi.nlm.nih.gov/pubmed/9142558

(108) https://www.ncbi.nlm.nih.gov/pubmed/3080766

(109) https://www.ncbi.nlm.nih.gov/pubmed/19211813

(110) http://www.ncbi.nlm.nih.gov/pubmed/21719534

(111) https://www.ncbi.nlm.nih.gov/pubmed/10190775

(112) http://www.health.harvard.edu/staying-healthy/exercising-to-relax

(113) https://www.ncbi.nlm.nih.gov/pubmed/3817754

(114) http://www.ncbi.nlm.nih.gov/pubmed/22017963

(115) http://www.ncbi.nlm.nih.gov/pubmed/21103034

(116) http://www.ncbi.nlm.nih.gov/pubmed/20523044

(117) https://www.ncbi.nlm.nih.gov/pubmed/1325348

(118) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2503954/

(119) https://www.ncbi.nlm.nih.gov/pubmed/15512856

(120) https://www.ncbi.nlm.nih.gov/pubmed/18662395

(121) http://www.ncbi.nlm.nih.gov/pubmed/23439798

(122) http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.324.8921

(123) http://www.ncbi.nlm.nih.gov/pubmed/19789214

(124) http://www.ncbi.nlm.nih.gov/pubmed/19170145

(125) https://www.ncbi.nlm.nih.gov/m/pubmed/25101546

(126) http://www.ncbi.nlm.nih.gov/pubmed/21036578

(127) http://link.springer.com/article/10.1007/BF02789143

(128) http://www.degruyter.com/view/j/cclm.1984.22.issue-11/cclm.1984.22.11.717/cclm.1984.22.11.717.xml

(129) http://www.ncbi.nlm.nih.gov/pubmed/6527092

(130) http://www.ncbi.nlm.nih.gov/pubmed/21835188

(131) http://www.ncbi.nlm.nih.gov/pubmed/6527092

(132) http://www.ncbi.nlm.nih.gov/pubmed/19931332

(133) http://www.ncbi.nlm.nih.gov/pubmed/1702662

(134) http://www.sciencedirect.com/science/article/pii/S0925443911000329

(135) http://news.berkeley.edu/2014/02/11/chronic-stress-predisposes-brain-to-mental-illness/

(136) http://dujs.dartmouth.edu/fall-2010/the-physiology-of-stress-cortisol-and-the-hypothalamic-pituitary-adrenal-axis#.VN9JHFXF8a4

(137) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3312696/

(138) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3186928/

(139) http://news.berkeley.edu/2014/02/11/chronic-stress-predisposes-brain-to-mental-illness/

(140) http://www.nature.com/mp/journal/vaop/ncurrent/full/mp2013190a.html%20

(141) https://www.ncbi.nlm.nih.gov/pubmed/23946275

(142) http://www.ncbi.nlm.nih.gov/pubmed/12537036

(143) https://www.ncbi.nlm.nih.gov/pubmed/22564216

(144) http://dujs.dartmouth.edu/fall-2010/the-physiology-of-stress-cortisol-and-the-hypothalamic-pituitary-adrenal-axis#.VN9JHFXF8a4

(145) https://www.ncbi.nlm.nih.gov/pubmed/10890824

(146) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4576517/

(147) https://www.ncbi.nlm.nih.gov/pubmed/17028025

(148) https://www.ncbi.nlm.nih.gov/pubmed/17028025

(149) https://en.wikipedia.org/wiki/Hypothalamic%E2%80%93pituitary%E2%80%93adrenal_axis

(150) https://www.eurekalert.org/pub_releases/2012-09/dc-wmo092412.php

Reviewed by Dr. Richard Nahas, MD CCFP DCAPM ABIM