health/other

• excess sugar can lead to type 2 diabetes
• excess fat can lead to obesity
• excess salt can lead to high blood pressure
• Problems with visking tubing !!

  • No villi - surface area too small
  • Can be used as a model gut but as it has no blood supply it cannot maintain a concentration gradient
  • Too short - needs to be 6m long
• Eating too much can result in cancer of large intestine( low fibre food highly processed), mobility issues/ knee joints ( too much high energy foods can lead to obesity and causes problems with mobility like stress on the joints) or even Gall stones (too much saturated fat and cholesterol)
• 2 food additives and problems linked to them

  1. Salt - high blood pressure which can lead to heart disease

  2. Yellow food colouring - hyperactivity in children/ allergic reactions
• Investigation on energy content on food

  1. Weigh a crisp on digital balance and record mass

  2. Use a measuring cylinder and measure 10cm³ of water and pour in boiling tube

  3. Use thermometer to measure temp at start and record

  4. Hold crisp in tongs and set alight in bunsen burner. When lit immediately hold under boiling tube

  5. Once completely burnt take temp of water and record

  6. Repeat steps 1-5 using improved method
• 1g crisp = temp rise x volume of water x 4.2 = J/KJ

  mass of food
• Vitamins do not require digestion as they are either water soluble or fat soluble - no enzyme required to digest vitamins