Cortisol is a stress hormone released by the adrenal glands.
It’s important for helping your body deal with stressful situations, as your brain triggers its release in response to many different kinds of stress.
However, when cortisol levels are too high for too long, this hormone can hurt you more than it helps.
Over time, high levels may cause weight gain and high blood pressure, disrupt sleep, negatively impact mood, reduce your energy levels and contribute to diabetes.
What Happens When Cortisol Is High?
Over the last 15 years, studies have increasingly revealed that moderately high cortisol levels can cause problems (1).
- Chronic complications: Including high blood pressure, type 2 diabetes and osteoporosis (2).
- Weight gain: Cortisol increases appetite and signals the body to shift metabolism to store fat (3, 4).
- Tiredness: It interferes with daily cycles of other hormones, disrupting sleep patterns and causing fatigue (5, 6).
- Impaired brain function: Cortisol interferes with memory, contributing to mental cloudiness or “brain fog” (7).
- Infections: It hampers the immune system, making you more prone to infections (8).
Fortunately, there are many things you can do to reduce your levels. Here are 11 lifestyle, diet and relaxation tips to lower cortisol levels.
1. Get the Right Amount of Sleep
Timing, length and quality of sleep all influence cortisol (10).
For example, a review of 28 studies of shift workers found that cortisol increases in people who sleep during the day rather than at night.
If you are a night shift or rotating shift worker, you don’t have complete control over your sleep schedule, but there are some things you can do to optimize sleep:
- Exercise: Be physically active during waking hours and keep a regular bedtime as much as possible (17).
- No caffeine at night: Avoid caffeine in the evening (18).
- Limit exposure to bright light at night: Turn off the screens and wind down for several minutes before bedtime (19, 20).
- Limit distractions before bed: Limit interruptions by using white noise, ear plugs, silencing your phone and avoiding fluids right before bed (21).
- Take naps: If shift work cuts your sleep hours short, napping can reduce sleepiness and prevent a sleep deficit (22).
Summary: Keep a consistent sleep schedule, avoid caffeine in the evening, avoid sleep interruptions and get seven to eight hours of sleep daily to keep cortisol in a normal rhythm.
2. Exercise, but Not Too Much
Depending on the intensity of exercise, it can increase or decrease cortisol.
This short-term increase helps coordinate growth of the body to meet the challenge. Additionally, the size of the cortisol response lessens with habitual training (23).
Summary: Exercise decreases cortisol at night. Intense exercise increases cortisol in the short term due to stress on the body, but still decreases it the following night.
3. Learn to Recognize Stressful Thinking
Stressful thoughts are an important signal for cortisol release.
A study of 122 adults found that writing about past stressful experiences increased cortisol over one month compared to writing about positive life experiences or plans for the day (28).
Mindfulness-based stress reduction is a strategy that involves becoming more self-aware of stress-provoking thoughts and replacing worrying or anxiety with a focus on acknowledging and understanding stressful thoughts and emotions.
Training yourself to be aware of your thoughts, breathing, heart rate and other signs of tension helps you recognize stress when it begins.
By focusing on awareness of your mental and physical state, you can become an objective observer of your stressful thoughts, instead of a victim of them (29).
Recognizing stressful thoughts allows you to formulate a conscious and deliberate reaction to them. A study of 43 women in a mindfulness-based program showed the ability to describe and articulate stress was linked to a lower cortisol response (30).
The Positive Psychology Program offers a review of some mindfulness-based stress reduction techniques.
Summary: “Stress mindfulness” emphasizes self-awareness of stressful thoughts and signs of body tension. Becoming more aware of stress and its triggers is the first step to successfully coping with stress.
4. Learn to Relax
Various relaxation exercises have been proven to reduce cortisol levels (32).
Deep breathing is a simple technique for stress reduction that can be used anywhere. A study of 28 middle-aged women found a nearly 50% reduction in cortisol with habitual deep breathing training (33, 34).
A review of several studies also showed massage therapy can reduce cortisol levels by 30% (35).
For example, listening to music for 30 minutes reduced cortisol levels in 88 male and female college students compared to 30 minutes of silence or viewing a documentary (42).
Helpguide.org has a brief guide to several relaxation techniques like those used in these studies.
Summary: Many relaxation techniques are proven to lower cortisol. Examples include deep breathing, yoga and tai chi, music and massage.
5. Have Fun
Another way to keep cortisol down is simply to be happy (43).
Activities that increase life satisfaction also improve health and one of the ways they do this may be through controlling cortisol.
For example, a study of 18 healthy adults showed cortisol decreased in response to laughter (46).
Developing hobbies can also promote feelings of well-being, which translate to lower cortisol. A study of 49 middle-aged veterans showed that taking up gardening decreased levels more than conventional occupational therapy (47).
Another study of 30 men and women found that participants who gardened experienced greater cortisol reductions than those who read indoors (48).
Part of this benefit may have been due to spending more time outdoors. Two studies found decreased cortisol following outdoor activity, as opposed to indoor activity. However, other studies found no such benefit (49, 50, 51).
Summary: Tending to your own happiness will help keep cortisol down. Taking up a hobby, spending time outdoors and laughing can all help.
6. Maintain Healthy Relationships
Friends and family are a source of great happiness in life, as well as great stress. These dynamics are played out in cortisol levels.
Cortisol is incorporated in tiny amounts into your hair.
The amounts of cortisol along the length of a hair even correspond to cortisol levels at the time that part of the hair was growing. This allows researchers to estimate levels over time (52).
Studies of cortisol in hair show that children with a stable and warm family life have lower levels than children from homes with high levels of conflict (52).
Within couples, conflict results in a short-term elevation in cortisol, followed by return to normal levels (53).
A study of conflict styles in 88 couples found nonjudgmental mindfulness or empathy led to a more rapid return of cortisol to normal levels following an argument (53).
Support from loved ones can also help reduce cortisol in the face of stress.
A study of 66 men and women showed that for men, support from their female partners reduced cortisol in response to public speaking (54).
Another study showed that having an affectionate interaction with a romantic partner before a stressful activity benefited heart rate and blood pressure more than support from a friend (55).
Summary: Relationships with friends and family can lead to happiness and to stress. Spend time with those you love and learn to forgive and manage conflict for better emotional and physical health.
7. Take Care of a Pet
Relationships with animal companions can also reduce cortisol.
In one study, interaction with a therapy dog reduced distress and resulting cortisol changes during a minor medical procedure in children (56).
Another study of 48 adults showed that contact with a dog was better than support from a friend during a socially stressful situation (57).
A third study tested the cortisol-reducing effect of canine companionship in pet owners compared to non-pet-owners (58).
Non-pet-owners experienced a greater drop in cortisol when they were given canine companions, likely because pet owners had already benefited from the friendship of their animals at the beginning of the study.
Interestingly, pets experience similar benefits following positive interactions, suggesting animal companionship is mutually beneficial (59).
Summary: Several studies show that interacting with an animal companion reduces stress and lowers cortisol levels. Pets also benefit from positive relationships with their humans.
8. Be Your Best Self
A program to help identify and cope with these kinds of feelings led to a 23% reduction in cortisol in 30 adults compared to 15 adults who did not participate (61).
For some causes of guilt, fixing the source will mean making a change in your life. For other causes, learning to forgive yourself and move on can improve your sense of well-being.
Developing a habit of forgiving others is also critical in relationships. One study of 145 couples compared the effects of different kinds of marriage counseling.
Couples who received interventions that facilitated forgiving and conflict resolution techniques experienced reduced cortisol levels (62).
Summary: Resolving guilt improves life satisfaction and cortisol levels. This may involve changing habits, forgiving others or learning to forgive yourself.
9. Tend to Your Spirituality
If you consider yourself spiritual, developing your faith can also help improve cortisol.
Studies show that adults who expressed spiritual faith experienced lower cortisol levels in the face of life stressors such as illness.
If you do not consider yourself spiritual, these benefits may also be available through meditation, developing a social support group and performing acts of kindness (66).
Summary: For those with spiritual inclinations, developing faith and participating in prayer can help control cortisol. Whether you’re spiritual or not, performing acts of kindness can also improve your cortisol levels.
10. Eat Healthy Foods
Nutrition can influence cortisol for better or for worse.
Consuming sugar is especially linked to higher cortisol in obese individuals (68).
Interestingly, sugar can also reduce the amount of cortisol released in response to specific stressful events (69).
Taken together, these effects explain why sweet desserts are good comfort foods, but frequent or excessive sugar increases cortisol over time.
Additionally, a few specific foods can benefit cortisol levels:
- Dark chocolate: Two studies of 95 adults showed that consuming dark chocolate reduced their cortisol response to a stress challenge (70, 71).
- Many fruits: A study of 20 cycling athletes showed eating bananas or pears during a 75-km ride reduced levels compared to drinking water only (72).
- Black and green tea: A study of 75 men found 6 weeks of drinking black tea decreased cortisol in response to a stressful task, compared to a different caffeinated drink (73).
- Probiotics and prebiotics: Probiotics are friendly, symbiotic bacteria in foods such as yogurt, sauerkraut and kimchi. Prebiotics, such as soluble fiber, provide food for these bacteria. Both probiotics and prebiotics help reduce cortisol (74).
- Water: Dehydration increases cortisol. Water is great for hydrating while avoiding empty calories. A study in nine male runners showed that maintaining hydration during athletic training reduced cortisol levels (75).
Summary: Cortisol-reducing foods include dark chocolate, tea and soluble fiber. Avoiding excess sugar consumption may also help keep your levels down.
11. Take Certain Supplements
Studies have proven that at least two nutritional supplements can lower cortisol levels.
One study looked at how seven men responded to mentally stressful testing over three weeks. One group of men took fish oil supplements and the other group didn’t. Fish oil reduced cortisol levels in response to stress (77).
Ashwagandha is an Asian herbal supplement used in traditional medicine to treat anxiety and help people adapt to stress.
A study of 98 adults taking an ashwagandha supplement or a placebo for 60 days showed that taking 125 mg of ashwagandha once or twice daily reduced cortisol levels (79).
Another study of 64 adults with chronic stress showed that those who took 300-mg supplements experienced reduced cortisol over 60 days, compared to those who took a placebo.
Summary: Fish oil supplements and an Asian herbal medicine called ashwagandha have both been shown to help reduce cortisol levels.
The Bottom Line
Over time, high cortisol levels can lead to weight gain, high blood pressure, diabetes, fatigue and difficulty concentrating.
Try the simple lifestyle tips above to lower your cortisol levels, have more energy and improve your health.
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Is Bread Really the Staff of Life… or the Stuff of Disease?
For most us, there are few foods more comforting than bread.
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The answers to these questions may surprise you!
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Sponsored Health Resources
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Enjoy! Let me know how these work out for you. And if you run across anything I've missed please let me know.