6th Feb

Question 1

Energy balance

Answer 1

Energy can be transformed from one form to another but cannot be created of destroyed. Total energy of a system is constant.

Question 2

Energy requirements measured in

Answer 2

1 kcal = 4.2 KJ

2550 males
1940 females

Question 3

Measurement of food energy

Answer 3

1 kilocalorie is quantity of heat needed to raise the temp of 1 kg of water by 1 degree

Question 4

Protein
Fat
Carbo
Carbo mono
Alcohol

Answer 4

4
9
4
3.75
7

Question 5

Regulation of intake

Answer 5

• hunger
• satiation
• satiety
• appetite

Question 6

Factors affecting energy intake?

Answer 6

Amount of exercise
Sleep
Environment you are in
Mood
Availability

Question 7

Our energy intake hasn’t increased but

Answer 7

Portion size have!

Question 8

Energy expenditure

Answer 8

Sedentary - BMR (75%), TEF - eating (10%), PA (15%)

PA - BMR (60%), TEF (10%), PA (30%)

Question 9

Measurement of energy expenditure

Answer 9

Direct calorimeters
Indirect calorimetry - ventilated hood
Doubly-labelled water

Question 10

Measurement of energy expenditure - exercise

Answer 10

Douglas bags - indirect calorimetry

Question 11

Energy use at rest

Answer 11

Liver 29%
Muscle 18%
Brain 19%
Heart 10%
Kidney 7%
Other 17%

Question 12

Thermal effect of food

Answer 12

Carbohydrates have a TEF or 15%
Proteins - 25%
Fats - 5%

Question 13

Is a calorie a calorie?

Answer 13

No - how saturated they are. 1g of protein diff to fat
No - how they are stored
Yes - unit of measurement by definition

Question 14

Best way to get a negative energy balance

Answer 14

Run 90 mins at 70% Vo2 max 1127 kcal expended

Reduced food intake at breakfast and lunch 1152 kcal less