121slide05 - The Lipids Triglycerides Phospholipids Sterols...

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The Lipids Triglycerides Phospholipids Sterols
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Calorie Values of Energy Nutrients Energy Nutrients Energy Carbohydrate 4 kcal/g Fat (lipid) 9 kcal/g Protein 4 kcal/g
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Lipids Three Main Types 1. Triglycerides 2. Phospholipids 3. Sterols
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Lipids Function Facts: 1. Fat is Energy Source 2. Fat is a Regulator 3. Fat as Structure
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Lipids Structure functions include… Key part of cell membranes How do we stay warm? How do we cushion organs from shock? Can you live with only 2% body fat?
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Lipids in the Foods We Eat We eat Triglycerides Fats and oils
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Fats and oils Fats are lipids which are SOLID at room temperature Oils are lipids that are LIQUID at room temperature
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Triglycerides- fats and oils Functions In foods Functions In foods
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Fat and Energy How much fat should we eat? 20-35% total calories from fat 20-35% total calories from fat < 10 % calories from saturated fat < 10 % calories from saturated fat Choose Choose MOSTLY MOSTLY polyunsaturated and polyunsaturated and monounsaturated fats monounsaturated fats Limit trans fatty acids- Limit trans fatty acids- keep as low as possible keep as low as possible < 300 mg cholesterol/day < 300 mg cholesterol/day
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Triglycerides- fats and oils How much am I eating? I ate 2100 calories yesterday and 70 grams of fat. Is this Good? Bad? On target?
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How Much Fat? 2100 calories and 70 g of fat 1. 70 g fat X 9 calories/g = 630 calories from fat 2. 630 calories/2100 total calories = 30% from fat What if YOU need 3,000 calories a day, how many grams of fat can you have? 1. 3000 calories x .30 (30% fat) = 900 calories fat allowed 2. 900 calories fat /9 calories/g = 100 g fat/day
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Chemical Structure Triglycerides Comprised of: Glycerol (3 Carbon backbone) 3 fatty acids The fatty acids differ—making up different types of fats Fatty acids can be 4-24 carbons long (all are even #) Can be Saturated or Unsaturated
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Fatty Acids and Triglycerides glycerol
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Fatty Acids Fatty acids categorized according to: Length Saturated vs. unsaturated
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Fat: Structure Two Main Categories of Fatty Acids: 1. Saturated Fatty Acids 2. Unsaturated Fatty Acids
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Fatty Acids Length of carbon chain Stearic acid – 18-carbon, saturated Simplified structure
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Unsaturated fatty acid structures Oleic acid – 18-carbon, monounsaturated Linoleic acid – 18-carbon, polyunsaturated
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Fats in the Foods We Eat Remember…we don’t eat fatty acids… we eat Triglycerides
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Food Fat Sources Animal Butter, steak, whole milk Saturated fat Low in Linoleic Acid Poor source of essential fatty acids Solid at room temperature Exceptions:
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121slide05 - The Lipids Triglycerides Phospholipids Sterols...

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