Who's the most stressed? A new study might just have the answer.

The findings, published in the Journal of Applied Social Psychology, shows that stress levels have increased by 10 to 30 percent among all different demographic groups in the U.S. between 1983 and 2009. However, Carnegie Mellon University researchers also found that stress decreased as people got older, with retirees reporting low stress.

"We know that stress contributes to poorer health practices, increased risk for disease, accelerated disease progression and increased mortality," study researcher Sheldon Cohen, a psychology professor at CMU, said in a statement. "Differences in stress between demographics may be important markers of populations under increased risk for physical and psychological disorders."

The study included examinations of stress at three specific points in time: 1983, 2006 and 2009. The researchers looked at all sorts of different demographic information, including gender, age, employment, race, education and income, to see if there were changes in stress among these groups over the 26-year period. The study was based on phone interviews of 2,387 adults, as well as online responses from 4,000 adults.

The researchers found that women, people with less education and people with low incomes reported more stress at all three time points than other demographics.

In addition, researchers found that particularly during the 2006 and 2009 timepoints -- when the economic downturn was occurring -- there were increased reports of stress among college-educated, employed, white, middle-aged men.

And while researchers did find that stress levels have increased between the start and end of the study, "it's hard to say if people are more stressed now than before because the first survey was conducted by phone and the last two were done online," Cohen said in the satement. "But, it's clear that stress is still very much present in Americans' lives, putting them at greater risk for many diseases such as cardiovascular, asthma and autoimmune disorders."

Is daily life stressing you out? Click through the slideshow for these natural ways to relieve stress, based on research:

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  • Bring Your Dog To Work

    A recent study in the <em>International Journal of Workplace Health Management</em> showed that <a href="http://www.huffingtonpost.com/2012/04/01/bringing-dog-to-work-stress_n_1391420.html" target="_hplink">bringing your dog to work</a> could help to lower office stress and boost employee satisfaction. "Pet presence may serve as a low-cost, wellness intervention readily available to many organizations and may enhance organizational satisfaction and perceptions of support," study researcher Randolph T. Barker, Ph.D., a professor of management at Virginia Commonwealth University, said in a statement. "Of course, it is important to have policies in place to ensure only friendly, clean and well-behaved pets are present in the workplace." The study, which looked at the pet-friendly company Replacements, Ltd., showed that employees who brought their dogs in to work experienced <a href="http://www.huffingtonpost.com/2012/04/01/bringing-dog-to-work-stress_n_1391420.html" target="_hplink">decreases in stress</a> throughout the work day. Meanwhile, self-reported stress <em>increased</em> for people who didn't bring their dogs, and for those who don't have dogs.

  • Laugh It Up

    If you're feeling particularly stressed, perhaps it's time to take a quick YouTube break. A small 1989 study in the <em>American Journal of the Medical Sciences</em> showed that<a href="http://www.ncbi.nlm.nih.gov/pubmed/2556917" target="_hplink"> "mirthful laughter"</a> is linked with lower blood levels of the stress hormone cortisol. The Mayo Clinic reported that laughter also promotes <a href="http://www.mayoclinic.com/health/stress-relief/SR00034" target="_hplink">endorphin release</a> in the brain and relaxes the muscles, which are all key for stress relief.

  • Grab A Shovel And Some Seeds

    Caregiving is extremely stressful, but a 2008 survey showed that gardening may help to reduce stress among caregivers. The survey, by BHG.com, showed that 60 percent of caregivers feel <a href="http://www.alz.org/national/documents/release_110308_garden.pdf" target="_hplink">relaxed when they garden</a>, the Alzheimer's Association reported. And, Health.com reported on a Netherlands study, suggesting that gardening can help to <a href="http://www.health.com/health/article/0,,20507878_2,00.html" target="_hplink">lower cortisol levels</a> and boost mood among people who had just finished a stressful task. That's because doing something that requires "involuntary attention" -- like sitting back and enjoying nature -- helps to replenish ourselves, Health.com reported.

  • Crack Open A Book

    Just <a href="http://www.telegraph.co.uk/health/healthnews/5070874/Reading-can-help-reduce-stress.html" target="_hplink">six minutes of reading</a> is enough to help you de-stress, the <em>Telegraph</em> reported. The study, which was sponsored by Galaxy chocolate, suggested that <a href="http://www.telegraph.co.uk/health/healthnews/5070874/Reading-can-help-reduce-stress.html" target="_hplink">reading was linked with a slower heart rate</a> and muscle relaxation. Drinking tea or coffee, listening to music and taking a walk also seemed to help lower stress, according to the <em>Telegraph</em>.

  • Call Mom

    Even if she's not there in person, a call to mom can help lower stress. <em>Scientific American</em> reported on a study in the journal <em>Proceedings of the Royal Society B</em> showing that young girls who <a href="http://blogs.scientificamerican.com/observations/2010/05/11/a-phone-call-from-mom-reduces-stress-as-well-as-a-hug/" target="_hplink">talked to their mothers on the phone</a> after completing stressful tasks had decreased cortisol (the stress hormone) in their saliva, and increased oxytocin levels (the bonding hormone). The girls who talked to their mothers on the phone had <a href="http://blogs.scientificamerican.com/observations/2010/05/11/a-phone-call-from-mom-reduces-stress-as-well-as-a-hug/" target="_hplink">decreased cortisol</a> and increased oxytocin levels compared with young girls who weren't allowed to contact their mothers at all, <em>Scientific American</em> reported -- girls who hugged their moms in person had a similar reaction to the phone group.

  • Eat Some Chocolate

    Dark chocolate doesn't only have health benefits for the heart -- eating it can also help to <a href="http://www.livescience.com/7974-chocolate-reduces-stress-study-finds.html" target="_hplink">lower stress</a>. LiveScience reported on a study illustrating that eating 1.4 ounces of <a href="http://www.livescience.com/7974-chocolate-reduces-stress-study-finds.html" target="_hplink">dark chocolate</a> a day for a two-week period is linked with decreased levels of the stress hormone cortisol. That study was published in 2009 in the journal <em>Proteome Research</em>. (But of course, chocolate still contains sugar and lots of calories, so make sure you're eating the chocolate in moderation!)

  • Gossip

    Gossip may not be viewed as socially "good," but it <em>might</em> have benefits in relieving stress. Researchers from the University of California, Berkeley, found that <a href="http://www.huffingtonpost.com/2012/01/17/gossip-stress-exploitation-heart-rate_n_1211207.html" target="_hplink">gossiping can actually lower stress</a>, stop exploitation of others and police others' bad behavior. "Spreading information about the person whom they had seen behave badly tended to <a href="http://www.huffingtonpost.com/2012/01/17/gossip-stress-exploitation-heart-rate_n_1211207.html" target="_hplink">make people feel better</a>, quieting the frustration that drove their gossip," study researcher Robb Willer, a social psychologist at UC Berkeley, said in a statement. Willer's research was published this year in the <em>Journal of Personality and Social Psychology</em>. So if something's bothering you, go ahead and gab -- but just make sure you move on so you don't dwell on the negative emotions!

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