Fat - AS1 - N&FS

  • Created by: sarahj123
  • Created on: 19-04-19 18:51

Fat

1g = 9kcal

Concentrated enegy source

Fats = Lipids ( insoluble )

Triglycerides = transport & store = 1 Glycerol & 3 Fatty Acids

Fats = CARBON & HYDROGEN & OXYGEN

Fat broken = oxidation & energy release

 

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Saturated Fat

  • Carbon saturated with hydrogen
  • NO double bond
  • Stable
  • Strong
  • Rigid

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Unsaturated Fat

  • Not all carbon saturated with hydrogen
  • DOUBLE BONDS
  • Not rigid
  • Flexible

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Mono vs Poly Unsaturated Fats

Mono

  • 1 double bond
  • OLEIC
  • Olive & Avocado

Poly = OMEGA 3 & 6

  • 1+ double bond
  • LINOLEIC
  • Peanut & Sunflower seeds

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Cis vs Trans

Cis

  • H atoms on same side
  • Bend
  • Natural form

Trans

  • H atoms on opposite side
  • Like line

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Functions

  • Cell membrane structure + energy+ metabolism ( stored in ADIPOSE TISSUE )

1. Energy reserve = subcutaneous + visceral + yellow bone marrow = deposited = meet higher energy demand eg. activity / pregnant 

2. Insulate layer = stop heat loss + maintain body temp

3. Fat layer = surround bones & organs (cushion)  = absorb shock = protect from trauma

4. Vitamin carrier = help absorb in intestine

5. Concentrated energy source = 9 kcal

Deficiency = Eyesight & nail & skin & kidney & growth &  problems 

Fat = 16-18 carbon atoms

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Essential Fat Acids

  • Body cant synthesis
  • Building blocks for fats
  • Polyunsaturated fatty acids
  • Oils & fats

Functions:

  • Make cell membranes ( nerve & brain & eye)
  • Lower BP
  • Nerve & immune & reproductive system
  • Thin blood
  • Lower cholesterol & triglycerides
  • Make EPA ( nerve function ) & DHA (brain function)
  • Make hormones (Prostaglandins & Eicosanoids)
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Omega 3 vs Omega 6

Omega 3 ( abundant in brain & breast )

  • Lower LDL & clots ( DOESNT LOWER LDL )
  • Improve circulation
  • Make eicosanoids ( organ function )
  • Oily fish
    Pumpkin seeds

Omega 6

  • Lower LDL ( LOWER HDL )
  • Regulate body temperature
  • Make prostaglandins ( regulate blood clots )
  • Sunflower oil
    Corn oil
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EXTRA INFORMATION

Cholesterol = fat like substance

  • Build cell membranes & sex hormones

Lipoproteins = carry cholesterol

Activity = ^ HDL

TRANS FATS = metabolised like saturated fat = ^ LDL & lower HDL 

OILY FISH & PREGNANCY NEEDED

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