環肥燕瘦~~也說說吧

來源: Bluebell 於 2013-04-19 13:56:06 [檔案] [博客] [舊帖] [給我悄悄話] 閱讀數 : (4346 bytes)

本文內容已被 [ Bluebell ] 在 2013-04-23 22:01:40 編輯過。如有問題，請報告版主或論壇管理刪除.

正經說個BMI與壽命的關係吧。我昨天才看到的，很吃驚，因為徹底顛覆了我以往的觀念。

美國，加拿大各自獨立做的一項長達12年之久的隨訪研究。

研究發現太瘦的人和太胖的人的壽命都比正常體重的人要短。這個很好理解，因為太瘦太胖營養都不好，身體發生疾病的風險都大。

意外的是研究發現，overweight vs normal weight 來說，overweight的人壽命比normal weight 要長。這點，兩國的獨立研究彼此相證實。

研究者進而解釋說，這項研究雖然控製了年齡，種族，性別等等可以預見的混雜因素，但不能控製生活質量這個重要問題。活的長不代表活的健康活的好。所以，呼籲人們要正確看待BMI，不要單純去追求體重計上的數字。BMI高，也有可能是肌肉發達的原因，因為肌肉重量遠高於脂肪的重量。

wiki上有個survival parodox的概念，是說，對於那些有心髒疾病的人來說，BMI 30-34.9 的人比正常體重的人死亡率要低，原因是反反複複減肥的人更容易得病。而適度的脂肪對健康有保護作用。

但是當一個人，LDL TG 都高的時候，就算是BMI再正常，也是有必要控製體重的。

假如配偶在這個時候還跟你說什麽手感啊媚態啊不要減吧，這樣的不負責任的配偶不要也罷。

我個人崇尚科學勝於文學。

原文附錄如下，僅供有心人參考。

wiki~~~
although the negative health consequences of obesity in the general
population are well supported by the available evidence, health outcomes in
certain subgroups seem to be improved at an increased BMI, a phenomenon
known as the obesity survival paradox.[56] The paradox was first described
in 1999 in overweight and obese people undergoing hemodialysis,[56] and has
subsequently been found in those with heart failure and peripheral artery
disease (PAD).[57]

In people with heart failure, those with a BMI between 30.0 and 34.9 had
lower mortality than those with a normal weight. This has been attributed to
the fact that people often lose weight as they become progressively more
ill.[58] Similar findings have been made in other types of heart disease.
People with class I obesity and heart disease do not have greater rates of
further heart problems than people of normal weight who also have heart
disease. In people with greater degrees of obesity, however, the risk of
further cardiovascular events is increased.[59][60] Even after cardiac
bypass surgery, no increase in mortality is seen in the overweight and obese
.[61] One study found that the improved survival could be explained by the
more aggressive treatment obese people receive after a cardiac event.[62]
Another found that if one takes into account chronic obstructive pulmonary
disease (COPD) in those with PAD, the benefit of obesity no longer exists.[

ScienceDaily~~

The study examined the relationship between body mass index and death among
11,326 adults in Canada over a 12-year period. (BMI uses height and weight
to estimate body fat.) Researchers found that underweight people had the
highest risk of dying, and the extremely obese had the second highest risk.
Overweight people had a lower risk of dying than those of normal weight.

"It's not surprising that extreme underweight and extreme obesity increase
the risk of dying, but it is surprising that carrying a little extra weight
may give people a longevity advantage"

"It may be that a few extra pounds actually protect older people as their
health declines, but that doesn't mean that people in the normal weight
range should try to put on a few pounds,"

"Our study only looked at mortality, not at quality of life, and there are
many negative health consequences associated with obesity, including high
blood pressure, high cholesterol, and diabetes."

"Good health is more than a BMI or a number on a scale. We know that people
who choose a healthy lifestyle enjoy better health: good food choices, being
physically active everyday, managing stress, and keeping blood pressure,
cholesterol, and blood sugar levels in check,"