Health and Nutrition

Question 1

Factors influencing energy requirements

Answer 1

Age
Activity
Gender
Pregnancy

Question 2

BMI calculation

Answer 2

Weight (kg)
BMI = ——————-
Square oh height (m)

Body Mass Index

Question 3

BMR

Answer 3

Basic metabolic Rate
Indicates hoes much energy a person requires at rest (sleeping)

It decreases as we get older as our growth slows down therefore less is required

Question 4

What energy is used for

Answer 4

Digesting food
Movement when sleeping
Brain function
Nerve impulses

Question 5

Conditions that may develop due to obesity

Answer 5

Arthritis 
Heart disease
Diabetes
Stroke
High blood pressure

Question 6

Food test for starch

Answer 6

To an amount of food add a few drops of IODINE

Any starch Preston will turn from yellow/brown to blue/black

Question 7

Food test for sugar

Answer 7

Mix food with water in a boiling tube
Add BENEDICTS solution
Heat gentle
Turn from blue-green-Brick red

Question 8

Food test for protein

Answer 8

Mix food with water in boiling tube
Add biuret solution (copper sulphate and sodium hydroxide)
Turn from blue to lilac

Question 9

Food test for fat

Answer 9

Add ethanol to crushed food and shake
Remove ethanol
Add water
Change form clear to form a white emulsion at the top

Question 10

Food test for vitamin C

Answer 10

Add DC PIP to food

Changes from dark blue to clear

Question 11

Vitamin C Equation

Answer 11

Concentration of Volume in ml of standard as as asorbic acid
Vitamin C in a fruit = ———————————————-
Juice sample. Volume in ml of fruit juice sample

We use a syringe to be more accurate
Test with several foods
Heat breaks up the vitamin C and releases the nutrients

Question 12

Energy in food Equations

Answer 12

Energy released from. Mass of water X temper tie rise X 4.2
Food per gram. = ————————-
(Kj). Mass of food sample

Question 13

How to improve energy released from food experiment

Answer 13

Heat escapes from the sides

Can be improved by confining the heat