[肥胖的标准与体内脂肪含量有关，微胖易长寿]前言：减肥一直是热门的话题，尤其是爱美的女性，有的家长也会刻意的控制孩子的体重，因为肥胖确实会使患上其他疾病的风险增大。但这不代表孩子一定要减到准水平，研究表明其实微胖的...+阅读
Studies suggest optimists live longer and enjoy better health than pessimists. The real mystery is why.
Among the findings of various studies:
Highy optimistic people he significantly lower death rates. Optimistic coronary bypass patients are half as likely as pessimists to require re-hospitalization.
People with positive emotions he lower blood pressure. The most pessimistic men are more than twice as likely to develop heart disease pared with the most optimistic.
But is it optimism that makes people healthy, or do healthy people understandably he a brighter outlook?
To get a better handle on things, scientists he adjusted their analyses in recent years to account for pre-existing medical conditions. Studies that made these adjustments found that existing illnesses don't negate the benefits of optimism, according to the May 2008 issue of Harvard Men’s Health Watch.
In one example of how humans keep their spirits up no matter what, researchers found o
lder people suffering various illnesses still said they thought they were aging well. Another study found that the sick and disabled don't wallow in misery as is monly believed.
Optimism, another study found, triggers activity in the same brain area that is known to malfunction among the depressed.
But why is optimism so beneficial?
Perhaps optimists enjoy better health and longer lives because they lead healthier lifestyles, build stronger social support works, and get better medical care, the Health Watch article suggested.
Also, stress is known to kill, releasing hormones that cause deterioration of everything from your gums to your heart. Optimists might he lower levels of stress hormones.
Heredity could play a role, too. It is possible that genes predispose some people to optimism, and that the same genes affect health and longevity.
More study is needed, the Health Watch article contends, because it's likely that multiple mechanisms are involved.
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