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在以往的研究中，在超重是不是会实质地影响健康的问题上存在争议，最近在“新英格兰医学期刊”上发表的研究报告通过对大量成年白种人的跟踪调查发现，以一个健康的女性为例，在其他生活习惯健康的情况下，单纯超重可以增加人的死亡率13％，肥胖可以增加死亡44－88％，而严重肥胖则可以使死亡率达到体重正常人群的2.5倍以上。而男性的研究结果于此相似。在这项研究中对于超重的标准是一个身高167厘米的人体重70公斤以上是超重，84公斤以上是肥胖，112公斤以上是严重肥胖。这项结果和2005年美国疾病控制和预防中心的研究结果向矛盾，那项研究显示超重不会对健康产生实质的影响，因此下一步的研究将是观察人的健身活动是否也会对健康有影响。
Even one extra kilo raises death risk: study
December 3, 2010 - 12:55PM
http://www.smh.com.au/lifestyle/wellbeing/even-one-extra-kilo-raises-death-risk-study-20101203-18j04.html
Lugging around a few extra kilograms? One of the largest studies to look at health and weight finds that you don't have to be obese to raise your risk of premature death. Merely being overweight carries some risk, too. Obesity increases the risk of death from heart disease, stroke and certain cancers. But whether being merely overweight contributes to an early death as well has been uncertain and controversial. Some research has suggested being a little pudgy has little effect or can even be a good thing.
The latest research involving about 1.5 million people concluded that healthy white adults who were overweight were 13 per cent more likely to die during the time they were followed in the study than those whose weight is in an ideal range.
"Having a little extra meat on your bones — if that meat happens to be fat — is harmful, not beneficial," said Dr Michael Thun of the American Cancer Society, senior author of the study.
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The study's conclusions, published in the New England Journal of Medicine this week, are similar to three other large studies, said the lead author, Amy Berrington of the National Cancer Institute.
"Now there's really a very large body of evidence which supports the finding that being overweight is associated with a small increased risk of death," Berrington said.
For their government-funded analysis, the researchers pooled 19 long-term studies of mostly white adults. They used each person's body mass index — a measure of height and weight — and checked to see who died during the follow-up periods, which ranged from five to 28 years.
They focused on people who were healthy at the beginning of the studies, excluding smokers and those with heart disease or cancer because those affect death rates and researchers wanted to see the impact of weight alone.
The lowest death rate for healthy women who had never smoked was in the high end of the ideal body mass index range — between 22.5 and 24.9. Compared with that group, those who were overweight had an increased risk of death of 13 per cent. The increased risk ranged from 44 to 88 per cent for those who were obese. The morbidly obese were 2.5 times more likely to die prematurely. The results for men were similar.
Overweight begins at a BMI measurement of 25, obese at 30 and morbidly obese at 40. A 167-centimetre tall person is considered overweight at 70 kilograms, obese at 84 kilograms and morbidly obese at 112 kilograms.
Because of its size and the diversity of studies included, the research "provides strong evidence against the position that it's a good thing for health to be overweight," Thun said.
The notion that a "bit of reserves" would help keep you from getting sick probably stems from the days when food was scarce, he said.
The latest research was launched after a controversial 2005 study by the Centres for Disease Control and Prevention that concluded being overweight didn't raise the risk of death; that report included smokers and those with pre-existing illnesses.
University of South Carolina obesity researcher Steven Blair said the results were consistent with other studies and the "massive effort" was commendable. But he said there wasn't enough information available about fitness level or physical activity. A proponent of the "fit and fat" theory, Blair said his research has shown that obese people who are tested and deemed fit did not face increased risks of dying.
"If we want to get to the bottom of the health hazards of overweight and obesity, we have to have better data on physical activity," Blair said. "Until we do that, there's uncertainty of how important BMI is as an important predictor of mortality."
AP
[ 本帖最后由 wdmznzd 于 2010-12-4 10:39 编辑 ] |
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