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How healthy are you? Your best guess might be pretty accurate: Researchers found that people who gave their health a positive rating¹ were less likely to fall ill or die over the next 30 years than were those who thought they weren’t as healthy. The work is in the journal

Public Library of Science ONE.

More than 8,000 Swiss men and women rated their health on a scale ranging from very poor to excellent. Researchers tracked them 30 years later. Within the same age group, men who rated their health as “very poor” were greater than three times more likely to have died than were those who rated their health as “excellent.” For women, the odds² almost doubled.

Nor was this trend limited to the extremes. The chances of dying went up from the “excellent” health group to the “good” one to the “fair” one, and kept increasing up to the “very poor” group.

And even after researchers took into account risk factors like smoking and medical history, the correlation³ between self-rated health and mortality remained. Maybe optimism⁴ also helps keep the doctor away.

Thanks for the minute for Scientific American 60 second Science, I am Sophie Bushwick.

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1 rating
n.级别，等级，额定值，责骂，收视率
参考例句：
It is a ship with a rating of 500,000 tons.这是一艘五十万吨级的船。 The opinion polls gave the president a high rating.民意测验显示人民对总统的支持率很高。

2 odds
n.让步，机率，可能性，比率；胜败优劣之别
参考例句：
The odds are 5 to 1 that she will win.她获胜的机会是五比一。 Do you know the odds of winning the lottery once?你知道赢得一次彩票的几率多大吗？

3 correlation
n.相互关系，相关，关连
参考例句：
The second group of measurements had a high correlation with the first.第二组测量数据与第一组高度相关。 A high correlation exists in America between education and economic position.教育和经济地位在美国有极密切的关系。

4 optimism
n.乐观，乐观主义
参考例句：
Don't pour cold water on their optimism.别给他们的乐观态度泼冷水。 Optimism made him alive through the hard days.乐观主义使他在艰难的岁月里活了下来。