Lipids - Lipids Storage form of energy Function of Fats in...

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Unformatted text preview: Lipids Storage form of energy Function of Fats in the Body 1. Major storage form of energy 2. Shock absorber for body organs 3. Insulation from cold temperatures 4. Medium for fat soluble nutrients 5. Raw material for various molecules (bile, vit. D) & component of cell membranes 6. Secretes hormones (estrogen) & produces enzymes that influence the bodys intake of food Characteristics of Body Fat More compact than glycogen due to low water content Some stored in muscle but most in specialized fat storage cells Fat cells can expand as needed There are essential & non-essential fats Fat in Foods Provides energy Adds appeal to foods aroma, flavor, tenderness Contributes to satiety Source of fatty acids & fat-soluable vitamins Classes of Lipids 1. Triglycerides Makes up about 95% of lipids in food & in the body Made of 3 fatty acid chains & a glycerol molecule Triglycerides Get characteristics from the fatty acid chains shorter & more unsaturated fats are softer than longer & more saturated ones Saturation - # of hydrogens attached to the fatty acids Saturated = all carbon atoms are holding a hydrogen atom Unsaturated 1 or more carbons are without a hydrogen atom Monounsaturated 1 carbon does not have a hydrogen atom Polyunsaturated 2 or more carbons without a hydrogen atom Effects of Hydrogenation Effects melting temperature the more unsaturated, the more liquid at room temperature Vegetable oils are rich in polyunsaturates Olive & canola oil are high in monounsaturates Animal fats are the most saturated Palm & coconut oil are unlike other plant fats in that they are highly saturated Health Implications Saturated fats are associated with increased risk of cardiovascular disease Monounsaturated fats has a beneficial effect in that it displaces harmful fats Polyunsaturated fats in controlled amounts are acceptable in the diet Classes of Lipids (cont) 1. Phospholipids Glycerol, 2 fatty acids & a phosphorus- containing molecule (in place of a 3 rd fatty acid) Soluble in water plays a role in dispersing fats in water emulsifier (lecithin) Plays a role in the structure of the cell membrane Helps fat travel back & forth across the cell membrane Classes of Lipids (cont) 1. Sterols Raw material for making bile Includes Vitamin D & sex hormones Cholesterol is an important part of the cell membrane (part of every cell including the brain & nerve cells) Can be made by the body production slows when dietary contribution increases Cholesterol is associated with plaques that narrow arteries Digestion of Fat 1. Liver produces bile & stores it in the gallbladder 2. When fat enters the intestines, the gallbladder contracts to release bile....
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Lipids - Lipids Storage form of energy Function of Fats in...

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