diet 2.24, 2.25, 2.26, 2.33B Flashcards
what is a food source of carbohydrates?
potatoes, bread, rice, cereals, fruit
what’s the function of carbohydrates?
fuel for respiration
what’s a food source of proteins?
meat, eggs, fish, quinoa, quorn
what’s the function of proteins?
growth and repair of cells and tissues
fuel for respiration
what’s a food source of lipids (fats)?
butter, cooking oil, cream, avocados
what’s the function of lipids (fats)?
store of energy
(thermal and electrical) insulation
fuel for respiration
what is energy measured in?
kilojoules (kJ)
practical -
measuring the energy content of a food sample:
- measure 25 cm3 of water into a boiling tube and record starting temperature
- measure the mass of food
- then mount food onto skewer
- set fire to food using bunsen burner
- hold the burning food under the boiling tube until it goes out
- keep doing this until the food wont light
- measure the finial temperature of water
then use equation
ENERGY IN J = MASS OF WATER IN G X TEMPERATURE CHANGE X 4.2 / MASS OF FOOD
how do u work out the amount of energy in the food?
ENERGY IN J = MASS OF WATER IN G X TEMPERATURE CHANGE X 4.2 / MASS OF FOOD
function of iron:
forms the part of haemoglobin which binds to oxygen
food source of iron:
read meat, liver, spinach
deficiency disease caused by low iron:
anaemia
function of calcium:
needed to form bones and teeth
food source of calcium:
milk, dairy products, fish, fresh vegetables
deficiency disease caused by low calcium:
rickets
is iron and calcium a mineral or vitamin?
mineral
use in the body of vitamin A:
making chemicals in the retina and protecting the surface of the eye
use in the body of vitamin C:
needed for cells and tissues to stick together
use in the body of vitamin D:
needed to absorb calcium and phosphate ions from food
effect of deficiency in vitamin A:
night blindness and damaged cornea
effect of deficiency in vitamin C:
scurvy
effect of deficiency in vitamin D:
rickets caused by weak bones
food source of vitamin A:
fish liver oil, liver, butter, carrots
food source of vitamin C:
fresh fruit and veg
