wtorek, 24 czerwca 2014

"Being lonely increases the risk of everything from heart attacks to dementia, depression and death, whereas people who are satisfied with their social lives sleep better, age more slowly and respond better to vaccines. The effect is so strong that curing loneliness is as good for your health as giving up smoking."

Realism can be bad for your health. Optimists recover better from medical procedures such as coronary bypass surgery, have healthier immune systems and live longer, both in general and when suffering from conditions such as cancer, heart disease and kidney failure.
It is well accepted that negative thoughts and anxiety can make us ill. Stress — the belief that we are at risk — triggers physiological pathways such as the “fight-or-flight” response, mediated by the sympathetic nervous system. These have evolved to protect us from danger, but if switched on long-term they increase the risk of conditions such as diabetes and dementia.
What researchers are now realizing is that positive beliefs don’t just work by quelling stress. They have a positive effect too — feeling safe and secure, or believing things will turn out fine, seems to help the body maintain and repair itself…
Optimism seems to reduce stress-induced inflammation and levels of stress hormones such as cortisol. It may also reduce susceptibility to disease by dampening sympathetic nervous system activity and stimulating the parasympathetic nervous system. The latter governs what’s called the “rest-and-digest” response — the opposite of fight-or-flight.
Just as helpful as taking a rosy view of the future is having a rosy view of yourself. High “self-enhancers” — people who see themselves in a more positive light than others see them — have lower cardiovascular responses to stress and recover faster, as well as lower baseline cortisol levels.

Our bodies may have evolved so that in situations of perceived social isolation, they trigger branches of the immune system involved in wound healing and bacterial infection. An isolated person would be at greater risk of physical trauma, whereas being in a group might favor the immune responses necessary for fighting viruses, which spread easily between people in close contact.
Crucially, these differences relate most strongly to how lonely people think they are, rather than to the actual size of their social network. That also makes sense from an evolutionary point of view,  because being among hostile strangers can be just as dangerous as being alone. So ending loneliness is not about spending more time with people, it is all about our attitude to others: lonely people become overly sensitive to social threats and come to see others as potentially dangerous. In a review of previous studies … he found that tackling this attitude reduced loneliness more effectively than giving people more opportunities for interaction, or teaching social skills.
There is some evidence that meditation boosts the immune response in vaccine recipients and people with cancer, protects against a relapse in major depression, soothes skin conditions and even slows the progression of HIV. Meditation might even slow the aging process. Telomeres, the protective caps on the ends of chromosomes, get shorter every time a cell divides and so play a role in aging. Clifford Saron of the Center for Mind and Brain at the University of California, Davis, and colleagues showed in 2011 that levels of an enzyme that builds up telomeres were higher in people who attended a three-month meditation retreat than in a control group.
As with social interaction, meditation probably works largely by influencing stress response pathways. People who meditate have lower cortisol levels, and one study showed they have changes in their amygdala, a brain area involved in fear and the response to threat.
In a study of 50 people with advanced lung cancer, those judged by their doctors to have high “spiritual faith” responded better to chemotherapy and survived longer. More than 40 percent were still alive after three years, compared with less than 10 percent of those judged to have little faith. Are your hackles rising? You’re not alone. Of all the research into the healing potential of thoughts and beliefs, studies into the effects of religion are the most controversial.
Critics of these studies … point out that many of them don’t adequately tease out other factors. For instance, religious people often have lower-risk lifestyles and churchgoers tend to enjoy strong social support, and seriously ill people are less likely to attend church.

Others think that what really matters is having a sense of purpose in life, whatever it might be. Having an idea of why you are here and what is important increases our sense of control over events, rendering them less stressful. In Saron’s three-month meditation study, the increase in levels of the enzyme that repairs telomeres correlated with an increased sense of control and an increased sense of purpose in life. In fact, Saron argues, this psychological shift may have been more important than the meditation itself. He points out that the participants were already keen meditators, so the study gave them the chance to spend three months doing something important to them. Spending more time doing what you love, whether it’s gardening or voluntary work, might have a similar effect on health. The big news from the study, Saron says, is “the profound impact of having the opportunity to live your life in a way that you find meaningful.”

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