Chapter 9: Energy Balance and Weight Management
Topics to be covered
A. Body weight and health
B. Energy balance
C. What determines body size and weight?
D. Managing body weight
E. Eating disorders
A. Body Weight & Health
a) Obesity in the USA Page 310
* Overweight: being too heavy for one’s height, usually due to an excess of body fat.
* Body mass index (BMI) of 25 to 29.9 kilograms/meter2.
* Obese: having excess body fat - BMI of 30 kg/m2 or greater.
* Globesity: reflects the escalation of obesity worldwide.
* In the United States: 68% of the population is overweight or obese.
View the CDC slides posted on D2L and click through to see the rise in obesity rates in the US over the last 25 years |
b) What’s Wrong with Having Too Much Body Fat? – Page 311
c) What Is a Healthy Weight? Page 311
* A healthy weight is a weight that minimizes health risks.
* Lean body mass (fat-free mass): body mass attributed to nonfat body components such as bone, muscle, and internal organs.
d) How is Healthy Weight Determined?
1. Body mass index (BMI): a measure of body weight relative to height.
* Current standard for assessing the healthfulness of body weight.
* Underweight: BMI of <18.5 kg/m2
* Healthy weight BMI of 18.5 to 24.9 kg/ m2
* Overweight: BMI of 25 to 29.9 kg/m2
* Obese: BMI of 30 to 39.9 kg/m2
* Extreme or morbid obesity: ≥40 kg/m2
To calculate BMI
Formula: weight (lb) / [height (in)]2 x 703
Divide weight in pounds (lbs) by height in inches (in) squared and multiply by a conversion factor of 703
Example: Weight = 150 lbs, Height = 5'5" (65") Calculation: [150 ÷ (65)2] x 703 = 24.96
Calculate your own BMI? OR Look up your BMI on Figure 9.3 on page 312
Shortcomings - Does not take into account body composition and fat distribution
In muscular athletes, BMI does not provide an accurate estimate of health risk - An athlete may be considered overweight or obese based on...