Midterm 2 Review Slides 2011 STUDENTS

Midterm 2 Review Slides 2011 STUDENTS - 1 MIDTERM #2 REVIEW...

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Unformatted text preview: 1 MIDTERM #2 REVIEW NOTES Triglyceride Glycerol + 3 fatty acids fatty acid fatty acid fatty acid C C C What are some food sources of triglyceride? Fat Triglyceride: chemical form in food fat and body fat Nucleus Fat droplet Cell membrane Fat Function: Energy Source: 9 kcal/gram Regulation Essential fats prostaglandins (nerves) Hormones - sex hormones Structure Insulation Membrane structure Fat Cell 2 Two Categories Of Fatty Acids 1. Saturated - contain no double bonds e.g. C16, C18 (palmitic, stearic) Food sources? 2. Unsaturated - contain one or more double bonds. These are referred to as Mono, e.g. C18:1, or Poly, e.g. C18:2 or C18:3, fatty acids Food sources? ________________________________ Essential Fatty Acids (EFA) These are fatty acids that the body cannot make and are essential for normal functions The essential fatty acids are 18:2 linoleic and 18:3 linolenic (omega-3) fatty acids Food sources: ________________________________________________ Hydrogenation Process of adding hydrogens to double bonds of unsaturated fatty acids Unsaturated fats (liquid) are unstable and go bad or rancid (off taste) Food sources of hydrogenated fats? ____________________________________ 3 There is no change in calories or cholesterol content Hydrogenation 1. Converts Unsaturated Saturated FA 2. Decreases EFA content 3. Changes fat from liquid to solid 4. Stabilizes the fat, it becomes more resistant to oxidation 5. Results in the formation of Trans fatty acids (detrimental to heart health) Fat Animal fat Saturated > Unsaturated Solid at room temperature Poor source of essential fatty acids Exceptions - Fish oil Fat Vegetable fat Unsaturated > Saturated Liquid at room temperature Good source of essential fatty acids Exceptions - Coconut oil, Palm oil 4 Fat s insolubility in water influences its digestion, absorption and transport Fat Gallbladder Stomach Small Intestine FAT DIGESTION AND ABSORPTION TG TG TG TG TG Bile Fat Digestion Begins in small intestine Once digested, TG (diet) + bile (an emulsifier formed by the body) form a micelle The micelle can be absorbed by the body Lipase enzyme from pancreas TG + Bile = Form Micelles (fat droplets) CHYLOMICRON = Fat droplet reforms with Protein coat ( type of lipoprotein = fat + protein) CHYLOMICRON enters circulation Gallbladder Stomach Small Intestine Fat Digestion And Absorption 5 Fat Absorption The micelle is transported across the intestinal wall and transformed into a chylomicron, which is released into the blood Chylomicron is a lipoprotein (TG and cholesterol with a protein coat)...
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This note was uploaded on 03/10/2012 for the course NUT 10 taught by Professor Roger during the Winter '08 term at UC Davis.

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Midterm 2 Review Slides 2011 STUDENTS - 1 MIDTERM #2 REVIEW...

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