怎樣才算胖

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1989 / 2月

文‧林麗雪 圖‧張良綱



一些愛漂亮的小姐最清楚的一個標準體重計算方式——男:身高減一百;女:身高減一百一十。

「其實,這個公式只適用於在伸展台的服裝模特兒」,台大醫學院院長黃伯超表示,中國成年人標準體重應該是——男性:(身高減八十)×○.七;女性:(身高減七十)×○.六。

但是,發育中的兒童和青少年身高、體重的變異性大,難有簡易的計算公式。直到民國七十四年,黃伯超院長從對台灣小朋友的體位調查資料中,找出適合中國孩發育的理想BMI值,而有了計算依據。

BMI值是「身體質量指數」,是將某年齡小朋友的平均體重(公斤)除以平均身高(公尺的平方),就是該年齡的BMI值。

由這些BMI值,黃教授得到兒童、青少年的正常標準體重的計算方法:

BMI值×身高(平方公尺)=正常標準體重

舉例來說,一位八歲的小男生,他的身高是一百廿六公分,而他的體量是四十公斤,到底這位小朋友的標準體重是多少呢?他是不是已經超重了呢?

參考黃伯超教授研究出的中國兒童、青少年的BMI值表,可以查出八歲小男生的BMI值是十六,所以這位小男孩的標準體重便可以計算出:

16(BMI值)×1.26×1.26=25.4公斤

由此可見,這位小朋友已超重了近十五公斤了。

不論成人或小孩,若以這些方式計算出標準體重,加減百分之十就是正常體重的上限和下限,若是超重百分之廿以上就是患了肥胖症了。

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中國兒童、青少年的BMI值

(資料來源:台灣大學醫學院院長黃伯超提供)

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EN

"Who Are You Calling 'Fat'?!"

Sophia Lin /tr. by Phil Newell


For girls who love beauty the clearest standard of body weight (measured in kilograms) is: for boys, height (in centimeters) minus 100; for girls, height minus 110.

"In fact, this formula is only for fashion models," says Dr. Huang Po-chao, Dean of the College of Medicine at National Taiwan University. The standard weight for Chinese adults should be: for men, height minus 70 times 0.7; for women, height minus 70 times 0.6.

However, the changes in height and weight for children and teens are great, and it is hard to come up with a formula. In turn, Dr. Huang has come up with the ideal "BMI" value for Chinese children based on data from a fitness survey done on kids in 1985. BMI means "body mass index" which is the average weight (in kilograms) for a given age divided by the square of the average height (in meters).

From the BMI, Dr. Huang went one step further to get a calculating method for the standard body weight for children and teens: BMI value × height (in meters)平方 = standard body weight.

Take for example an eight-year-old boy whose height is 126 cm and weight 40 kg. What's the standard weight for such a child? Is he already overweight?

From referring to the Chinese children studied by Dr. Huang and using the BMI value chart for youths, we find that the BMI value for an eight-year-old boy is 16. Therefore the standard weight for this child is calculated as follows:

16 (BMI value) × 1.26平方 = 25.4 kg.

From this we can see that our hypothetical little friend is already 15 kg overweight.

Regardless of whether we are talking about adults or children, if one's actual body weight is no more than 10% higher than the calculated "standard weight" (as an upper limit) or 10% lower (as the lower limit), then one's body weight can be considered within the standard range. The real problem is when actual body weight exceeds the standard by more than 20%--then it's time to worry.

BMI Values For Chinese Children and Youths

(Data suppiled by Dr. Huang Po-chao, Dean of the National Taiwan University Medical School)

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