Chapter 5 - Lipids- composed of carbon, hydrogen, and...

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Lipids- composed of carbon, hydrogen, and oxygen -More carbon and hydrogen than oxygen -More than half energy than carbs or protein -Fats are hydrophobic -Separate from watery fluids of the GI tract -Enzymes for digesting fats are hydrophilic -Water-loving -Efficient storage form of energy -Poor conductor of heat Triglyceride-one molecule of glycerol and three fatty acids -Basically chains of carbons -Free in food or body -Condensation reactions combine a hydrogen atom from the glycerol and hydroxyl group from a fatty acid, forming a molecule of water (H20) and leaving a bond between the two molecules -Contain a mixture of more than one fatty acid -GI tract- 50-100 grams -Provide cells with energy - Adipose tissue -Readily take up and store triglycerides -Secretes several hormones known as adipokines -Proteins that help regulate energy balance & influence body functions -Link between obesity, type 2 diabetes, hypertension, & heart disease Fatty Acids-may be 4 to 24 (even #) carbons long -18 carbons most common -May be saturated or unsaturated -Unsaturated ones have one or more points of unsaturation - Monounsaturated or polyunsaturated -Mono -Oleic acid -Abundant in olive oil and canola oil -Tend to belong to the Omega 9 group -Poly -two or more carbon-to carbon double bonds -Organic acid -(COOH) at one end and a methyl group (CH3) at the other end -Acetic acid- the shortest -Long chain (12-24 carbons)-meats, fish, and vegetable oils Saturated fatty acid-Stearic acid -Fully loaded with hydrogen atoms -Contains single bonds between carbon atoms
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-Every carbon must have 4 bonds -Two carbons must form a double bond-shape bends here -Double bond is the point of unsaturation - Unsaturated fatty acid-two hydrogens missing and a double bond
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This note was uploaded on 07/31/2011 for the course NUTRITION 101 taught by Professor Zahora during the Spring '11 term at Gardner-Webb.

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Chapter 5 - Lipids- composed of carbon, hydrogen, and...

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