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Unformatted text preview: NST10 - Lipids 21:14 What are the functions of lipids? Major source of energy STORE in body Big diff between amount you eat and store Reservoir of energy / bank account Precursors of hormones and signaling molecules Steroid hormones (estrogen, testosterone) Prostaglandins and related Fat soluble vitamins: A , D, E, K Myelination of nerve fibers : allows efficient electrical impulse propagation in brain Insulation and heat conservation blubber? *** What are kinds of fats in the diet? (diff kinds of fat have diff impl.) Saturated: animal fats, milk products Effects on blood lipids -> heart disease Monounsaturated: olive oil (1 double bond) Polyunsaturated: vegetable oils (many double bonds) Omega-3 fatty acids: oily fish Solid at room temp bad for you o Butter o Lard More liquid the fatty acid better Cholesterol-rich fats Essential fatty acids: body cant make them What lipids do people eat 25-45% fat in typical macronutrient content of western diet Recommended diet: <30% energy from fat, <7% saturated Major differences in types of dietary fats o Mediterranean (mono unsaturated), milk and meat (saturated), fish (omega 3) Sources of Body Fat: Fat in body is what you ate composition is very similar to the dietary fat Body can convert CHO and alcohol into fat novolipogenesis Storage of fats in adipose tissue Close to 150000 kcal in nonobese humans Great majority in adipose tissue living organism Complex biology...
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- Fall '08