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什么是BMI？ 所谓BMI，是Body Mass Index的缩写，即身体质量指数，是国际上常用的衡量人体肥胖程度的重要标准。BMI是通过我们人体体重与身高这两个数值来获取的，可有效评判一个人的健康营养状况。 它的计算方法也很简单，即BMI=体重（kg）÷身高2（m2）。 我一直认为BMI的公式应该根据大型流行病学调查结果来进行重新调整，可能是体重除以身高的2.x次方。 但这个指标已经用了那么多年了，撇开体脂率腰臀比内脏脂肪等等指标不谈，无数的科研成果都是根据BMI来计算肥胖的。 BMI，是比利时统计学家凯特勒在十九世纪提出来的指标，计算公式：BMI = 体重（kg） / 身高²（m²）。 这个公式并不是对统计结果的数据拟合，原理并不是正态分布和标准差，而是一个简单的数学理论。 直观地说，BMI描写了人体对外界造成的压强。
BMI有几个明显的局限性在衡量健身人群的健康或体型状况时产生误导 1. BMI不区分肌肉和脂肪 • 高肌肉量导致BMI偏高：BMI的计算公式仅根据身高和体重，而不考虑体重组成。 如果一个人肌肉含量较高，体重就会偏重，从而导致BMI指数偏高。 如果你的BMI值在标准范围内，但想要了解最佳的理想状态下的体重是多少 可以通过世卫计算方法进行计算： 男性： (身高cm－80)×70﹪=标准体重 女性： (身高cm－70)×60﹪=标准体重 标准体重正负10﹪为正常体重 标准体重正负10﹪~ 20﹪为体重过重或过轻 标准体重正负20﹪以上为肥胖或体重不足 超重计算. BMI计算式亦适用于15-20岁的人，但他们的过重及过轻定义方法，就不是用固定的BMI决定。 这是因为儿童青少年正处发育期，BMI随着发育在变动，若使用一个固定数值，容易造成错误判断。 很多国家及地区每年都会为当地的儿童作身高和体重的统计。
Body mass index (bmi) is a commonly used index to help assess weight status and screen for obesity
Bmi is a measure of weight in relation to height, and the bmi number is obtained by dividing body weight in kilograms by height in meters squared (bmi = kg/m2) in the bariatric community specifically, this measurement is used to help determine if a patient qualifies for bariatric surgery. 世界版的BMI指数正常是25，但是中国版的把这个数值改到了24。 如果是因为亚洲人比欧美体型更小，那为什么日本和韩国没有把25这个标准改掉呢？ 为什么一些亚洲地区将BMI大于23或者24定义为超重而不是BMI大于25？ 以下内容摘自维基百科: 东南亚与亚洲其他地区的BMI标准 世界卫生组织经过专家评估后认为，东南亚成人的超重指标低于世界平均水平。
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