During the teenage years, hormonal (荷爾蒙的) changes lead to physical changes like rapid muscle growth, burst in height, and weight gain in both boys and girls. Take a look at the information and height and weight charts for teens presented in this article if the question “How much should I weigh for my age and height” is bothering you.

Average Height and Weight Charts for Teens

Faster growth in kids usually can be noticed at age 8. Genetic factors also determine the physical growth of a child. So, it is perfectly normal for two kids of the same age to have different weights and heights. The following figures should be used as guidelines only.

For Boys

For Girls

Age

Height

Weight

Height

Weight

in Years

in Inches

in Pounds

in Inches

in Pounds

12-13

58-62

85-100

60-63

95-105

14-15

63-66

105-125

63-64

105-115

16-17

67-70

130-150

64

115-120

18-20

68-70

150-160

64

125-130

Ideal Body Fat Percentage

Fit men have 14% - 17% body fat.

Fit women have 21% -24% body fat.

Male athletes have 6% -13% body fat.

Female athletes have 14% - 20% body fat.

The ideal body fat percentage varies mainly according to age, sex and the physical activity of the individual. But it is a fact that some female athletes have body fat as low as 10 % and some male athletes had lower than 4% body fat. So, it can be observed that other than the above mentioned factors, genetic factors also influence the body-fat ratio.

Body Mass Index (BMI)

You may use the following formula to calculate your BMI:

As per SI Units (國際單位) : BMI = mass (kg)/[height (meters) ]2

Imperial (英制的) Units 1: BMI = mass (Ib. ) x703/[ height (in. ) ]2

Imperial Units 2: BMI = mass (Ib. ) x 4. 88/[ height (ft) ]2

Following conclusions can be derived from (得到) calculating the BMI:

BMI Calculated

Conclusion

BMI 18.5~25

Normal or ideal weight

BMI > 25

Overweight

BMI < 18. 5

Underweight

BMI < 17. 5

Extremely underweight

BMI = 30 or BMI > 30

Obese(病態(tài)肥胖的)

BMI = 40 or BMI > 40

Extremely obese

1.According to the Average Height and Weight Charts for Teens, ____.

A. girls keep on growing taller during the teenage years

B. girls grow faster at the end of teenager years than boys

C. girls grow faster at the beginning of teenager years than boys

D. boys' average weight is always heavier than girls' during the teenage years

2. Which of the following statements about ideal body fat percentage is RIGHT?

A. Fit men have higher body fat percentage than fit women.

B. Male athletes have higher body fat percentage than fit men.

C. Female athletes have lower body fat percentage than male athletes.

D. Male athletes have much lower body fat percentage than female athletes.

3.After calculating the BMI, you can reach the conclusion whether ____.

A. your weight is normal

B. your hormone level is normal

C. your height is right for your age

D. your body fat percentage is ideal

4.If a boy is 1. 5 meters in height and weighs 68 kilograms, then he is ____.

A. normal B. obese

C. extremely obese D. underweight

1.C

2.D

3.A

4.B

【解析】

試題分析：在青少年時期，荷爾蒙的改變會導致身體的變化，在身高和體重上都會改變，男孩和女孩的變化是不一樣的。身高和體重的變化是否正常，本文給出了具體的計算方法。

1.1】C細節(jié)理解題。從圖表For Boys 12-13歲，身高58-62inches；For Girls12-13歲，身高60-63 inches，可知在青少年初期女孩比男孩長得快。故選C。

2.2】D細節(jié)理解題。根據(jù)Ideal Body Fat Percentage部分所提到的，Male athletes have 6% -13% body fat.Female athletes have 14% - 20% body fat.從這里可看出男運動員比女運動員有更低的脂肪。故選D。

3.3】A推理判斷題。根據(jù)Body Mass Index (BMI)這一部分，BMI Calculated 計算結(jié)果是BMI 18.5~25，得出結(jié)論“正�；蚶硐氲捏w重”；計算結(jié)果是 BMI > 25，得出結(jié)論Overweight“超重”，所以可知通過計算the BMI可得出你的體重是否正常的結(jié)論。故選A。

4.4】B推理判斷題。根據(jù)Body Mass Index (BMI)中的計算方法，這個1.5米高，重68千克的男孩的BMI是體重除以身高的平方約等于30.7，根據(jù)圖表中的BMI = 30 or BMI > 30，說明是Obese(病態(tài)肥胖的)，故選B。

考點：這是一篇健康類的說明文。

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