W6 Lipids

W6 Lipids - Chapter 6 Lipids. LIPIDS: NOT JUST FAT...

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LIPIDS: NOT JUST FAT TRIGLYCERIDES (FATS), PHOSPHOLIPIDS AND STEROLS Lipids…. Chapter 6
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Lipids Essential nutrients Provide energy 9 calories/gram Help transport fat- soluble nutrients Vitamins A, D, E, K Contribute to flavor and texture of food Photo © PhotoDisc
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Lipids What are lipids? Triglycerides Stored in adipose tissue Fats and oils in food Phospholipids Plant and animal origin Body can make them Soluble Sterols Cholesterol
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Fatty Acids Are Key Building Blocks Fatty acid Determines solid or liquid Chain length 4 to 24 carbon length
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Fatty Acids Are Key Building Blocks Saturation Saturated fatty acid All single bonds between carbons Monounsaturated fatty acid One carbon carbon double bond Polyunsaturated fatty acid More than one carbon carbon double bond
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Figure 6.03: Fatty acid chain lengths and liquidity.
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Figure 6.05: Liquid or solid at room temperature?
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Fatty Acids Are Key Building Blocks Cis vs. trans Cis fatty acids Occur naturally Chain is bent Trans fatty acids Produced by hydrogenation Chain is straighter In the body: ↓ HDL “good” cholesterol ↑ LDL “bad” cholesterol
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Fatty Acids Are Key Building Blocks Nonessential and essential fatty acids Nonessential fatty acids Can be made in the body Not “essential” to have in your diet
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Fatty Acids Are Key Building Blocks Nonessential and essential fatty acids Essential fatty acids Can’t be made in the body Must come from food Linoleic acid and alpha -linolenic acid Used to make eicosanoids Linoleic acid omega 6 Alpha-linolenic omega 3
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Triglycerides Structure Glycerol + three fatty acids Functions Energy source 9 kcal/g Energy reserve Form of stored energy in adipose tissue At rest 60% of the energy used by the body is from dietary and stored fats
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