Chapter 7: Energy Balance and Weight Control

Components of Energy Expenditure: Basal Metabolism

60-80%

Components of Energy Expenditure: Physical Activity

15-30%

Components of Energy Expenditure: Thermic Effect of Food

8-15%

Direct Calorimetry

Measures heat released from body to determine energy use; typically uses a metabolic chamber (rarley used)

Estimated Energy Requirements

A way of estimating caloric needs based on age, physical acitivty, weight, height, and gender.

Indirect calorimetry

Measures body’s energy use by measuring oxygen uptake and carbon dioxide output (more common)

BMI

Body weight in kg/height in meters or (weight in lbs X 703) height in inches

BMI Classification

Underweight: < 18.5

Normal: 18.5- 24.99

Overweight: 25-29.99

Obese: 30 or above

BMI is a screen tool and doesn’t account for ________ or _________

body composition or health behaviors

Nature

Genetics contribute to weight, body shape, and thrifty metabolism

Nurture

A variety of environmental and social factors contribute to obesity, including food insecurity, stress, lack of sleep low socioeconomic status, and excessive screen time

What is the formula for BMI w/metric units

(body weight in kg) / (height in meters squared)

What is the formula for BMI with standard units?

(weight in lbs x 703) / (height in inches squared)