Lipids Notes FDNS 2100
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Popular in Nutrition and Food Sciences
This 3 page Class Notes was uploaded by Summer Boone on Friday October 2, 2015. The Class Notes belongs to FDNS 2100 at University of Georgia taught by Grossman in Summer 2015. Since its upload, it has received 36 views. For similar materials see Human Nutrition and Food in Nutrition and Food Sciences at University of Georgia.
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Date Created: 10/02/15
Lipids oz Usefulness of fats worksheet on ELC oz Lipids enter fat cells from blood and exit to the bloodstream Fat gives a lot of calories but little weight oz Triglycerides 1 glycerol 3 fatty acids Q Can be 3 different fatty acids in 1 triglyceride o Categorized by the most abundant fatty acid Linolenic Fatty Acid an omega3 fatty acid Linoleic Fatty Acid an omega6 fatty acid 9 Found in veggies meats and eicosanoids o De ciency is uncommon but with a chronic disease a de ciency is possible Can be saturated fatty acids monounsaturated or polyunsaturated Saturated fatty acids 9 No double bonds of carbon o Solid at room temperature example butter Monounsaturated o 1 double carbon bond o Liquid at room temperature and solid if in the fridge o Examples olive oil canola oil peanut oil sesame oil Polyunsaturated o 2 or more double carbon bonds 9 Always a liquid o Usually from plants example corn oil and saf ower oil Usually from animals example butter and lard except coconut oil and palm oil they are from plants Most common form of fat in food and the body 393 Phospholipids similar to triglycerides but contain phosphate and nitrogen instead of a 3rd fatty acid 9 Make up the cell membrane o Emulsifying agent help water and fat mix oz Sterols composed of multiple ring structures o Starting material for cholesterol made by body bile sex hormones adrenal hormones Vitamin D Cholesterol can be converted to all of these o Cholesterol is a type of sterol in foods of animal origin only No plants contain cholesterol oz Lipids in the Body A Lipid Digestion o In the small intestine where most lipid digestion occurs o Lipids must rst be emulsi ed by bile 9 Facts about bile Made from blood cholesterol Can be reabsorbed and reused or trapped by soluble ber example oats in the intestine and then excreted If bile is excreted more blood cholesterol is used to make more bile o This is how soluble ber lowers blood cholesterol B Absorption and Transportation of Lipids 9 Small fats water soluble go to the blood stream and then to the liver o Larger fats not water soluble are packaged into chylomicrons then go to the lymph system and then to the bloodstream Chylomicrons contain triglycerides cholesterol and phospholipids C Lipid Transport in the Blood o Transported as lipoproteins with a transport vehicle Transport vehicle clusters of lipids with proteins around it o Types of Lipoproteins in the body chylomicrons very low density lipoproteins VLDL low density lipoproteins LDL and high density lipoproteins HDL LDL quotbad cholesterolquot less healthy disperse cholesterol through the body HDL quotgood cholesterolquot healthy transport cholesterol back to liver from cells body tissues for disposal 393 Health Effects of Lipids Cardiovascular Disease CVD elevated total body cholesterol risk factor Cholesterol should be less than 200 Dietary Saturated Fatty Acids raise quotbadquot blood cholesterol o Polyunsaturated fats lower LDL this is good 9 Monounsaturated fats raise HDL this is good Diets high in omega3 fatty acids sh oils lower blood cholesterol 9 Consume sh at least once a week for this To improve LDLHDL ratio o Weight control put monounsaturated and polyunsaturated fats in diet eat soluble bers example oatbran antioxidants Vitamin C and E moderate alcohol exercise Also being female before menopause helps Cancer high density fat saturated fat increases some cancers Obesity dietary saturated fat is easily converted 90 ef cient to body fat
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