Chapter 6: Measurement of Energy in Food Flashcards
How does bomb calorimeter work?
It operates on the principle of direct calorimetry by measuring the heat liberated as food burns completely.
Bomb Calorimeter
Lab use this device to measure the total heat of combustion values of various food macronutrients
Heat of combustion
This concept refer to the heat liberated by oxidizing a specific food. It represents food’s total energy.
What factor affects the heat of combustion in carbohydrates?
The heat of combustion for carbohydrates varies depending on the arrangement of atoms in particular carbohydrate molecule.
What factor affects the heat of combustion for lipids?
The heat of combustion varies with lipids with the structural composition of the triacylglycerol molecules’ fatty acid compoments.
Name two factors that affect energy release from protein
- Type of protein in food
2. Relative Nitrogen content of the protein
How much more energy per gram of lipids produced compared to energy per gram of carbohydrate?
120% more energy
How much more energy per gram does lipid produce compared to protein?
65% more
Why does lipids produce more energy than proteins and carbohydrate?
Lipids has more hydrogen atoms available for clevage
Factors that affect the total energy expenditure include all of the following except
Physical Activity
Amount of Carbohydrate consumed
Climate
Dietary- induced thermogenesis
Amount of Carbohydrate consumed
A bomb calorimeter operates on the principle of _________.
direct calorimetery
Physical Activity has no impact on human energy expenditure
True or False
False
During activities ranging from rest to moderate aerobic exercise, the RQ always reflects the oxidation of pure carbohydrate or pure fat.
True or False
False
Some advocates promote the use of vegetables in weight loss diets because of plant protein’s _________ coefficient of digestibility
relatively low
All of the body’s metabolic process ultimately produce heat.
True or False
True
