Nutrition Through the Life Cycle (...

6th Edition
Judith E. Brown
ISBN: 9781305628007



Nutrition Through the Life Cycle (...

6th Edition
Judith E. Brown
ISBN: 9781305628007
Textbook Problem

Seven-year-old Timothy’s mother takes him to his pediatrician for his annual checkup. His weight is 68 pounds (31 kg), plotted at the 95th percentile, and his height is 50 inches (127 cm), between the 75th and 90th percentiles for his age. His body mass index of 19.25 kg/m2 plots at the 95th percentile for his age. His growth percentiles have been increasing over the last several years. Timothy’s mother expresses concern to the pediatrician about her son’s weight. His older and younger brothers are both thinner than Timothy. Timothy’s mother is obese, but his father is a normal weight for height. Timothy is in the second grade. He rides the school bus to and from school. He participates in the School Lunch Program at his school, but his parents gave him extra money in case he wants to buy some additional à la carte food items from the cafeteria or items from the vending machines. After school, Timothy and his brothers stay in their home with a babysitter until one of their parents returns home from work. Timothy usually watches TV or plays video games after school. His parents leave snack foods—chips, cookies, and sodas—in the house for their sons to have after school. His mother usually prepares their evening meal, which consists of a meat, starch, vegetables, and a dessert item. After dinner, Timothy does his homework and then usually watches more TV with his parents. He usually has a dish of ice cream before going to bed.

Timothy in Case Study 12.1 returns to his pediatrician 6 months later at 7½ years of age for a weight check. He has gained 10 kg in 6 months and now weighs 90 pounds (41 kg). His height has increased to 51 inches (130 cm).

Which of the following classifies Timothy’s BMI-for-age percentile?

  1. a.      Underweight
  2. b.      Normal weight
  3. c.       Overweight
  4. d.      Obese

Summary Introduction

To classify: Person T’s BMI for age percentile.

Introduction: Centers for Disease Control and Prevention (CDC) growth charts are used to determine physical growth in children of 2-20 years of age. These charts are gender specific and are plotted in percentiles. These charts help in assessing and identifying health related problems in children.


Reason for the correct answer:

Option d. is given as “Obese”

During an annual visit to the pediatrician when Person T was 7 years old, he weighed 68lb (31 kg), which was at 95th percentile and had a height of 50 in. (127 cm) between 75th and 90th percentiles. With the BMI (19.25) at 95th percentile for his age, his growth percentiles were observed to be increasing every year. Person T has a habit of snacking and his lifestyle is void of much physical activities. Person T returned to his pediatrician after 6 months for a weight check. He has gained 10 kg weight, which is 90 lb (41 kg) and his height is 51 in. (130 cm).

According to the case summary, Person T is a male and his current weight is 41 kg and height is 130 cm, which is equal to 1.3 m. The body mass index is calculated using the expression as given below:

Body mass index (BMI)=Weight in (kg)[height in (m)]2=41(1.3)2= 24.26 kg/m2

Then, calculate the BMI-for-age using current BMI (24.26) and 95th percentile BMI (19.6) six months ago as given below:


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