Energy In Food Flashcards
Who needs more energy: a woman who is pregnant or a woman who isn’t pregnant? Why?
The woman who is pregnant because she’s got a baby inside her and needs enough energy for both her and the baby
Who needs more energy: a male or a female? Why?
Male because he’s bigger and does more stuff like lifting heavy things
Who needs more energy: a 70 year old or a teenager? Why?
A teenager because they’re growing and a 70 year old isn’t
Who needs more energy: a cycle dispatch rider or a receptionist? Why?
Cycle dispatch rider because they’re doing physical exercise whilst a receptionist’s just sitting down all day
Who needs more energy: a girl in summer or a girl in winter? Why?
Both because a girl in winter needs energy to keep herself warm and a girl in summer because she needs energy to cool down
Name three things we need energy for
To keep the heart pumping blood around the body
Daily activities
Everything we do (sitting, standing etc.)
Growing
Breathing
How do you calculate the food energy per gram food (J/g)?
4.2 x mass of of water (g) x the temperature rise (°C) / mass of food (g)
While watching TV, a boy used up about 6 kJ per minute.
a) In what ways will the boy’s body use up the energy while sitting watching TV?
To keep the heart pumping blood around the body, breathing, growing and staying alive.
b) How long would it take to dye up all the energy obtained from a Bounty bar by watching TV? Show your working.
117 (energy in bounty) x 4.2 = 491.4 kJ
491.4 / 6 {energy used up per minute} = 81.9 minutes
Why do we eat?
To respire: glucose + oxygen — water + CO2 + ENERGY
