A balanced diet + practical

Cards (19)

  • carbohydrates: glucose is used to produce energy (ATP)/if too much is eaten stored as glycogen
  • proteins: growth + repair of tissues
  • Fats: store of energy + thermal insulation
  • Water: essential part of many body functions and processes
  • Iron (minerals): production of haemoglobin
  • haemoglobin = found in red blood cells
  • Vitamin c = mantains healthy tissue
  • Fibre = provides bulk in the digestive system (prevents diarrhea)
  • Sugar = added for taste + to increase shelf life --> type 2 diabetes , obesity + tooth decay
  • Fat = increase taste --> obesity + heart disease
  • Salt = taste / shelf life --> high blood pressure
  • Practical:
    1. weigh 1g of food
    2. record starting temp of water
    3. ignite food with bunsen burner + hold under tube until fully burned
    4. record final temp of water ---> find difference
    5. use: equation
  • Limitation of practical = method under-estimates energy content ---> heat energy can easily escape as it is not insulated + food may not completley burn
  • improvement of prac = insulate apparatus with foil + use dataloggers
  • fats = 2x energy of carbohydrates + proteins
  • hazards of prac =
    • burning food is hot - hot grease could drip on you - control = hold with tongs
    • boiling tube is hot - could burn hand - heatproof gloves
  • independent variable = change
  • dependent variable = measure
  • Control variable = factors to ensure accurate results