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Lecture 8 Fall 09 - The Lipids Fats Oils Phospholipids and...

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The Lipids: Fats, Oils, Phospholipids, and Sterols Professor Mutz Fall 2009
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The Lipids… Food lipids fall into three classes Triglycerides – 95% of all dietary/food fat Phospholipids – similar to triglyceride but has a phosphorus in place of a fatty acid Sterols – cholesterol
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Fats in the body… Energy stores – fat is body’s chief form of stored energy Muscle fuel – after glycogen, fat is chief form of fuel for muscular work Emergency Reserves – fat serves as energy in times of illness and diminished intake Padding – fat serves to protect the internal organs from shock Insulation – fat tissue insulate against temperature extremes through subcutaneous fat layers Cell Membranes – fat is major material of cell membranes Raw Materials – Fats are converted to other compounds such as hormones, bile, and Vitamin D as needed
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Main Storage Form If body’s preferred source of energy is glucose, why is energy stored as fat?
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