to the double bond followed by a rotation of the chain about the temporary

To the double bond followed by a rotation of the

This preview shows page 81 - 84 out of 107 pages.

to the double bond followed by a rotation of the chain about the temporary single bond linkage in the fat molecule and loss of this hydrogen atom back to the catalyst permits the reformation of a double bond in the trans arrangement. Answer: True During the process of hydrogenation, hydrogen is added to the unsaturated fat to convert some of the "double bonds" into "single bonds" of saturated fat. Answer: True Trans fats do not occur naturally in food products. Answer: False (Trans fats are naturally occurring in products such as beef, cheese (brie), milk and butter but present research indicates they are not harmful.) Video 8 Familiar Food - Meat o “Carcass of Beef” – Rembrandt (1657) o Obvious fat in meat Illustrate percentage of saturated fat by butter equivalents Meat is equivalent to 5 pats of butter (15% of the pat of butter is water, thus the butter equivalence is around 4) - Fillet Mignon o Less fat by several percentage points That is why it’s so tender The way the fibre is will create a toughness - Cholesterol Build-Up o Mix with bile acid in artery Problem of consuming too much saturated fat Artery will build-up and raise cholesterol level Activity 3: How Many Calories from Fat in a Serving of Red Meat? Assume a 14 oz (400g) steak contains 50% water, 30% protein, and 20% fat.
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What percentage of the total calories comes from fat? Answer: 1) Determine the number of grams from fat and protein. 400 g x 20% = 80 g fat 400 g x 30% = 120 g protein 2) Determine the number of calories from fat and protein. 80 g x 9 cal/g = 720 cal fat 120 g x 4 cal/g = 480 cal protein 3) Divide the number of calories from fat by the total number of calories. 720 cal + 480 cal = 1200 cal 720/1200 = 60% calories from fat Video 9 Cholesterol Containing Food (Egg) - Cholesterol & Saturated Fat in Food Cholesterol in Body o What people think? Saturated fat does contribute to elevated cholesterol level But ~80% of cholesterol in body is produced by the boy Less of an issue for food content - Hamburger o “In America, we no longer fear God or the communists, but we fear fat” – David Kritchevsky (Wistar Institute) o Krispy Kreme burger with bacon and cheese Ultimate high calorie meal - Big Mac Diet o Prison guard in Fond du Lac, Wisconsin has eaten at least two Big Macs daily during the past 29 yrs. 14.5 cattle
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6,250,000 sesame seeds - The issue over fat is not so clear o Three independent research groups from 1987-1992 worked on computer models on life expectancy if saturated fat was reduced from the usual 30% to 10% 1) Harvard Medical School – 1987 3 days to 3 months if saturated fat is reduced 2) UCSF in 1988 showed 3-4 months increased lifetime 3) A McGill study showed the same o Shows the result is not overwhelming to reduce saturated fat - Study (2010) o Replace saturated fats with unsaturated fats Showed a reduction in heart disease Some reports do not show this o Do not replace with carbohydrates This will increase obesity - Another Study o American Journal of Clinical Nutrition
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