Lecture 9 Fall 09

Lecture 9 Fall 09 - The Lipids: Fats, Oils, Phospholipids,...

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Click to edit Master subtitle style 10/16/10 The Lipids: Fats, Oils, Phospholipids, and Sterols Prof Mutz Fall 2009
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10/16/10 Last Class… Dietary fats Triglycerides (95%) Sterols Phospholipids Physical properties Degree of saturation
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10/16/10 Lipid Digestion No digestion in the mouth Only in infants – enzyme to digest breast milk Stomach Fat separates from watery components and floats along top Little digestion takes place in stomach Small Intestine – main sight of fat
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10/16/10 Lipid Digestion Continued Once emulsified lipase from pancreas can break dietary fat (triglycerides) down into smaller more absorbable molecules Pancreatic lipase Fatty acids split from the Triglyceride (glycerol backbone) Bile aids the absorption of the dietary fat across the intestinal cell
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10/16/10 Fat Transport Smaller products of lipid digestion travel directly to the bloodstream x liver Larger fat molecules require transporters Lipoproteins – proteins pared with lipids which serve as vehicles for fat in blood Chylomicrons LDL, VLDL, HDL
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10/16/10 Dietary Fat, Cholesterol, and Health Heart disease number one killer of adults in U.S. and Canada Diet high in saturated or tans fats Dietary Recommendations – 20-35% daily energy from fat % calories from fat >35% - saturated fat reaches levels associated with chronic disease 2g or LESS of trans fat
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Lecture 9 Fall 09 - The Lipids: Fats, Oils, Phospholipids,...

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