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In several studies, mindfulness meditation appeared to increase levels of T-cells or T-cell activity in patients with HIV or breast cancer. This suggests that mindfulness could play a role in fighting cancer and other diseases that call upon immune cells. Indeed, in people suffering from cancer, mindfulness appears to improve a variety of biomarkers that might indicate progression of the disease. In another study, elderly participants were randomly assigned to an eight-week Mindfulness-Based Stress Reduction (MBSR) course or a moderate-intensity exercise program.
Studies suggest that long-time meditators may have greater telomere lengths. In one experimental study, researchers found that breast cancer survivors who went through MBSR preserved the length of their telomeres better than those who were on a waitlist. However, this study also found that general supportive therapies impacted telomere length; so, there may not be something special about MBSR that impacts cell aging.
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Mindfulness also involves acceptance, meaning that we pay attention to our thoughts and feelings without judging them—without believing, for instance, that there’s a “right” or “wrong” way to think or feel in a given moment.
A small 2016 pilot study used neuroimaging to see how mindfulness practice changes the brains of parents—and then asked the kids about the quality of their parenting. The results suggest that mindfulness practice seemed to activate the part of the brain involved in empathy and emotional regulation (the left anterior insula/inferior frontal gyrus) and that the children of parents who showed the most activation perceived the greatest improvement in the parent-child relationship. We must remember, however, that these studies are often very small, and the researchers themselves say results are very tentative. Mindfulness seems to reduce many kinds of bias. We are seeing more and more studies suggesting that practicing mindfulness can reduce psychological bias. For example, one study found that a brief loving-kindness meditation reduced prejudice toward homeless people, while another found that a brief mindfulness training decreased unconscious bias against black people and elderly people. In a study by Adam Lueke and colleagues, white participants who received a brief mindfulness training demonstrated less biased behavior
For example, drug addictions, at heart, come about because of physiological cravings for a substance that relieves people temporarily from their psychological suffering. Mindfulness can be a useful adjunct to addiction treatment by helping people better understand and tolerate their cravings, potentially helping them to avoid relapse after they’ve been safely weaned off of drugs or alcohol. The same is true for people struggling with overeating.
Then, they were given the Stroop test—a test that measures attention and emotional control—while having their brains monitored by electroencephalography. Those undergoing breath training had significantly better attention on the Stroop test and more activation in an area of the brain associated with attention than those in the active control group.
Find “micro-moments” of mindfulness throughout the day to reset your focus and sense of purpose.
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Meditation does have an impact on physical health—but it’s modest. Many claims have been made about mindfulness and physical health, but sometimes these claims are hard to substantiate or may be mixed up with other effects. That said, there is some good evidence that meditation affects physiological indices of health. We’ve already mentioned that long-term meditation seems to buffer people from the inflammatory response to stress. In addition, meditators seem to have increased activity of telomerase, an enzyme implicated in longer cell life and, therefore, longevity. But there’s a catch. “The differences found [between meditators and non-meditators] could be due to factors like education or exercise, each of which has its own buffering effect on brains,” write Goleman and Davidson in
Those who took the mindfulness program showed significant improvements stress relief on the six-minute walking test (a measure of cardiovascular capacity) and slower heart rates than those in the waitlist group.
In another study, people with heart disease were randomly assigned to either an online program to help them practice meditation or to a waitlist for the program while undergoing normal treatment for heart disease.
Meditation has proven benefits, but the style that works best depends on a person's habits and preferences. In this episode of The Science of Happiness, we explore walking meditation, a powerful practice for feeling more centered and grounded. Dan Harris, host of the award-winning 10% Happier podcast, shares how walking meditation helps him manage the residual stress and anxiety from years of war reporting and high-pressure TV anchoring.
While one review of randomly controlled studies showed that mindfulness may have mixed effects on the physical symptoms of heart disease, a more recent review published by the American Heart Association concluded that, while research remains preliminary, there is enough evidence to suggest mindfulness as an adjunct treatment for coronary disease and its prevention.