Lipid Function

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Lipid Function
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Lipid Function in the Body - Energy

• The structure of lipids makes them bundles of
  energy
• They contain more kcals per gram then
  carbohydrates or proteins because of their
  structure of long chains of carbons and hydrogens

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Lipid Functions in the Body Phospholipids

• Phospholipids are most known for the fact that
  they make up cell membranes
• They do exist outside membranes
• Surfactants in lungs (wetting properties)
• Component of bile (detergent properties)

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Cholesterol

• Cholesterol your body needs is made by the liver
  dietary cholesterol is useless
• Lipoproteins carry cholesterol around in the
  blood to and from the liver
• HDL Good cholesterol
• LDL Bad cholesterol

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Lipid Functions in the Body Cholesterol

• Cholesterol is vital in producing vitamin D and
  some hormones (sex hormones)
• Maintains structure of cell membranes
• Digestion precursor for bile
• Important in nervous system

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Functions of Fats in Foods

• Tenderizers
• That flaky, light texture of baked goods
• Aerations
• Fat can form air bubbles in batter and dough
• Emulsions
• A mixture of two unmixable substances
• Butter, milk, mayonnaise
• Flavor
• Fats give some characteristics flavors

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Commercial Uses of Fats

• Hydrogenation
• Chemical process in which hydrogen is added to
  unsaturated fats
• It is possible to partially hydrogenate
• This changes liquid oils to semi-solid fats (adds
  spreadableness)

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Sub-Types of Fats in Foods

• Milk fats
• Animal fats
• Vegetable butters (cocoa butter)
• Marine (fish oils)
• Fats with oleic or linoleic acids (corn,
  sunflower, olive oils)
• Fats with linolenic acid (soybean oil)

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The Fate of Dietary Fat

• Fats (triglycerides) in food are broken down in
  fatty acids and glycerol and absorbed in your
  digestive system
• Some are stored in the liver
• Converted to glycogen or left as is
• Excess fats end up in adipose tissue throughout
  the body

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