PHED-3126EL Lecture Notes - Lecture 3: Calorimeter, Lipid Peroxidation, Food Energy
28 Dec 2019
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Chapter 3 food energy and optimum nutrition for physical activity. One kilogram-calorie (kcal) expresses quantity of heat necessary to raise temperature of 1kg of water 1oc from 14. 5oc to 15. 5oc. Bomb calorimeter measures gross energy value of food macronutrients: directly measures heat liberated as food burns. Caloric value of food: sums of heats of combustion of three macronutrients. Complete lipid oxidation in the bomb liberates 65% more energy per gram than protein oxidation and 120% more energy than carbohydrate. Digestive efficiency: completeness of digestion and absorption: nutrient availability for metabolism determines its caloric yield. Average digestive efficiency: carb: 97, lipid: 95, protein: 92, variation in protein digestion efficiency varies from 97% for animal protein to. Calorie reflects food energy regardless of source. From an energy standpoint, 100 kcal from mayonnaise equals the same 100 kcal in 20 celery stalks, 100 kcal of ben and jerry"s peanut butter fudge, or 30 asparagus spears. The more food consumed; the more kcals consumed.
