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2.  one important of macronutrient.  each one gm of fat yield 9 kcal of energy.  importance of fat :  1-source of energy & storage.  2-essential nutrient supply.  3-food satiety [ feeling of taste,& add flavor to food, slow gastric emptying.

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4.  1-energy production.  2-thermal insulation.  3-vital organ protection.  4-nerve impulse transmission.  5-enter in cell membrane structure & help in transportation of nutrient cross the cell membrane.  6-enter in cell metabolism { lipo protein carry fat in the blood to all cells }.  7-essential precursor substance{ fatty acid & cholesterol }.

5.  N B : too much of fat store in adipose tissue lead to increase body WT hypertension,heart disease,diabetes mellitus.  *physical characteristic of fat : greasy in touch,insoluble in water.  *types of fat :  1- saturated fat : comes from animal origin,fatty acid saturated with hydrogen.  2- monosaturated fat : comes from plant origin as olive oil,fatty acid saturated with one hydrogen ion.  3- poly saturated fat : fatty acid is saturated with two or more of hydrogen ion,comes from plant source as coconut oil, palm oil.

6.  the body cant manufacture it & therefore must obtain it from the diet.  -function :  @ membrane structure { strength the cell membrane }.  @cholesterol transport to blood.  @has role in blood clotting prolonged of clotting time  @ local hormone like effect { prostaglandin,prostacycline thromboxane,& leukotriens

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8.  1stly discovered in the semen which comes from prostatic gland.  Has role in smooth mulched tone & platelet aggregation.  Derived from fatty acid  Hormone like action,regulation of gastric acid secretion.  Has role in inflammatory process & body temp. control.  Lower of Bp.

9.  Three fatty acid chains attached with glycerol,[ monoglycerids,diglycerids,triglycerides ].  saturated fatty acid comes from animal source as milk, meat,eggs.  unsaturated fat comes from plant source as vegetable oils.  visible & hidden food fat :  visible butter, margarine,oil salad dressing,bacon & cream.  hidden fat : egg yolk is fat, white is pure protein, also nuts seeds, olives,avocadoes

10.  Run in blood stream, consider vital structure in human metabolism, origin from steroid.  essential in formation of bile.  enter in enzymatic digestion of fat.  found in large amount in the brain &nerve tissue.  essential component of cell membrane.  cholesterol has role in cardio vascular disease { atherosclerosis }.

11.  NB:  Lipoprotein is a mixture of lipid & protein.  -HDL: high density lipoprotein.  -LDL: low density lipo protein.  * digestion of fat:  -in the mouth fat break down into small particles by chewing & mastication.  -in the stomach mechanical mixing of fat with gastric secretion.

12.  - in the small intestine, bile secretion & pancreatic enzyme, with small intestine secretion digest fat.  - because fat is not water soluble unite with protein to form lipo protein go to lymphatic system for absorption.  - metabolism : burn out of fat to produce energy.

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14. Thanks for Your Attention! 14