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Mental health: Walking in nature is as good as therapy and drugs

Mental health: Walking in nature is as good as therapy and drugs

Recent meta-analyses confirm that exercise significantly alleviates symptoms of depression, with activities like walking, yoga and strength training showing robust benefits for mental health. However, doing more than one hour of strength training per week, for example, will begin to negate longevity benefits. Moderate exercise such as walking, however, cannot be overdone.

One comprehensive review concluded that physical activity is 1.5 times more effective than the most prescribed antidepressants in reducing symptoms of depression and anxiety.

Despite limited studies, dancing has shown substantial positive effects on mood, potentially enhanced by the social interaction and physical movement involved.

Consistent physical activity also significantly lowers the risk of insomnia, which is a common problem in depression.

If you struggle with depression, a consistent exercise routine should be your first priority. Just make sure you get the exercise dosing correct for the type of exercise you’re doing so that you’re not inadvertently negating other benefits.

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Meta-Analysis Confirms the Therapeutic Potential of Exercise for Depression

By Dr. Joseph Mercola, 17 May 2024

For years, researchers have highlighted the therapeutic potential of exercise when it comes to preventing and treating depression. I’ve been a long-term advocate for exercise as a primary treatment option for depression, and two recent meta-analyses confirm just how well-reasoned this advice has been.

The most recent of the two, published in the February 2024 issue of the BMJ,1,2 analysed 218 randomised controlled trials with 14,170 participants, and found that a wide variety of exercises significantly alleviate symptoms of depression, regardless of severity. As reported by the authors:3

Lead author Michael Noetel, a senior lecturer at the School of Psychology in Queensland, Australia, told PsyPost:4  “We were surprised exercise worked so well for so many people. The benefits were bigger than we expected. Exercise was as good as therapy and drugs.”

Dance Your Blues Away

While dancing showed a particularly large effect, the authors didn’t give it much consideration due to the low number of studies (only five), and the low number of participants in each study. It makes sense that dancing would have a significant effect on mood though, considering it’s difficult to dance and hold on to distressed emotions. Try it sometime.

Dancing with a partner also brings in the oxytocin aspect. Oxytocin is often referred to as the “love hormone” because it plays a crucial role in forming social bonds and increasing trust among individuals.

It can improve relationships, which is a significant factor in overall mental well-being. It also has a calming effect and can reduce stress levels and anxiety by lowering the stress hormone cortisol. Music also engages your emotions, so it makes sense that music combined with physical movement might have a unique ability to change one’s emotional state.

Exercise is 1.5 Times More Effective than the Best Antidepressants

The second analysis – an overview of 97 systematic reviews5,6,7 – involved 128,119 participants who took part in 1,039 different trials. It was published in 2023. Populations included healthy adults, people with mental health disorders and people with chronic diseases.

This is the most comprehensive review of research to date and clearly demonstrates that exercise can rapidly alleviate mild to moderate symptoms of depression, anxiety and other forms of psychological distress. Importantly, it found that exercise was 1.5 times more effective than the most prescribed antidepressants. As reported by the University of South Australia, which performed the umbrella review:8

Exercise Banishes Insomnia

In related science news,9 exercise also has demonstrably beneficial effects on sleep, helping to banish insomnia, which is a common complaint among those with depression.

The study, published in BMJ Open,10 included 4,339 participants, ages 39 to 67, who were followed for 10 years. Thirty-seven percent of participants consistently did not exercise while 25% were regularly active, 20% stopped being active and 18% started exercising between the beginning and the end of the study.

Compared to those who didn’t exercise regularly, those who exercised regularly throughout the study had 40% lower odds of insomnia, and this finding held true even after accounting for factors such as age, gender, body mass index, smoking history and study location.

“Physically active people have a lower risk of insomnia symptoms and extreme sleep duration, both long and short,” lead study author Dr. Erla Björnsdóttir, sleep expert and researcher at Reykjavik University, told CNN Health, adding:11

If You’re Over 40, Avoid Jogging

While many studies stress the importance of high-intensity exercise for depression, a systematic review and meta-analysis published in the March-April 2023 issue of Missouri Medicine12 highlights the importance of proper exercise dosing depending on the type of exercise performed.

When it comes to jogging, people over 40 increase their risk of atrial fibrillation by a massive 500% to 800% from this type of exercise. What they concluded is that once you get into your mid-40s and 50s, exercise should be fun and stress-reducing, not competitive.

High-Intensity, High-Volume Exercise Backfires After a Certain Point

Other types of high-intensity exercises can also backfire if you do too much of them. The 2023 Missouri Medicine analysis13 found that while vigorous exercise up to 75 minutes per week reduced the risk of all-cause mortality and other diseases in a dose-dependent manner, benefits plateaued after that.

So, people who were doing four to seven hours of vigorous exercise per week didn’t get any additional benefit, and from a cardiovascular standpoint, lost some.

Endurance exercise such as jogging and running can also cause drastic elevations in cortisol, which can wreck your health. One of the functions of cortisol is to raise low blood sugar, but it does this by breaking down your muscles, bones and brain.

It sacrifices your lean muscle mass to release amino acids that your liver converts to glucose in a process called gluconeogenesis. So, ultimately, chronically elevated cortisol will increase inflammation and impair your immune function.

Cortisol is also the primary ageing hormone. If it is chronically elevated, you will likely die prematurely as it is highly catabolic, meaning it breaks down tissues. To stay healthy as you age you need to be anabolic and build healthy tissues like muscle and mitochondria; and high cortisol will seriously impair those efforts.

Moderate Exercise Cannot Be Overdone

On the other hand, they found that you cannot overdo moderate exercise, loosely defined as exercising to the point where you’re slightly winded but can carry on a conversation. Examples include gardening, walking, recreational bike riding, yoga, non-intense swimming and pickleball.

Perhaps even more surprising, moderate exercise also improves all-cause survival better than vigorous exercise – about two times better.

Walking is perhaps one of the best forms of exercise. It’s about 2,000 steps per mile, and every 1,000 steps you get on average per day reduces your mortality by 10% to 15%. Benefits don’t plateau until you reach 12,000 steps a day, but you never start losing benefits from walking too much.

Overdoing Strength Training is Worse than Doing Nothing at All

The Missouri Medicine analysis14 also detailed the sweet spot for strength training, and it’s far lower than previously thought. The graph below, from the meta-analysis, shows the J-shaped dose-response for strength training activities and all-cause mortality. As you can see, the benefit maxes out right around 40 to 60 minutes a week. Beyond that, you’re losing benefit.

In the video above, best-selling author and high-performance coach Siim Land reviews these and related findings.

Once you get to 130 to 140 minutes of strength training per week, your longevity benefit becomes the same as if you weren’t doing anything, which is nothing short of shocking. If you train for three to four hours a week, you actually end up with WORSE long-term survival than people who don’t strength train!

Granted, these data are focused on longevity, not depression relief, but I wouldn’t recommend getting into a habit that will ameliorate one area while backfiring in another.

So, the take-home message here is that 20 minutes of strength training twice a week on non-consecutive days, or 40 minutes once a week, is the sweet spot for optimal payoff in the long term. You also don’t want your exercise regimen to centre around strength training. It should be an add-on, as you get far greater long-term benefits simply from walking or any other moderate exercise.

Other Studies Confirm Importance of Strength Training in Moderation

Other studies confirm the importance of strength training in moderation, keeping your weekly total to an hour or less. Among them is a systematic review and meta-analysis of 16 studies published in the British Journal of Sports Medicine in 2022.15

Muscle-strengthening activities were associated with a 10% to 17% lower risk of cardiovascular disease (“CVD”), total cancer incidence, Type 2 diabetes and all-cause mortality.

As in the Missouri Medicine analysis, this review found a J-shaped association, with a maximum risk reduction of all-cause mortality, CVD and cancer (10 % to 20%) being observed at a dose of 30 to 60 minutes per week. After 60 minutes, the benefits of strength training started to diminish and above 140 minutes per week, it was associated with an increased risk of all-cause mortality.

Yet another 2022 systematic review published in the American Journal of Preventive Medicine found that:16

Get Your Nature Fix

Lastly, the Missouri Medicine analysis also discusses the benefits of spending time in nature. You need at least 1.5 to two hours outdoors each week for good health, even if it’s only a local park or tree-lined street.

As noted by lead author Dr. James O’Keefe, a cardiologist with the Mid-America Heart Institute at St. Louis Hospital in Kansas City, whom I interviewed about these results:

So, in conclusion, if you struggle with depression, a consistent exercise routine should be your first priority. Just make sure you get the exercise volume or dosing correct for the type of exercise you’re doing so that you’re not inadvertently negating other benefits.

Sources and References

About the Author

Dr. Joseph Mercola is the founder and owner of, a Board-Certified Family Medicine Osteopathic Physician, a Fellow of the American College of Nutrition and a New York Times bestselling author.  He publishes multiple articles a day covering a wide range of topics on his website

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