NU FS305 Lecture Notes - Lecture 8: Skeletal Muscle, Anorexia Nervosa, Orlistat
23 Jan 2017
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Energy in = energy out (body weight is stable) Energy out resting (ie. sleeping), physical activity, thermogenesis. Weight gain when energy intake exceeds energy expenditure positive energy balance. Weight loss when energy expenditure exceeds energy intake negative energy balance. Therefore for each 3500 kcal eaten in excess 454g or 1 lb body fat is stored. Need to burn 3500 kcal beyond those consumed. Food + o2 heat + co2 + h2o. Direct measure = energy (heat) coming from food. Indirect measure/energy = o2 consumed + co2 expelled kcalories foods provide. Bomb calorimeter measures the available energy in foods. = >>> than energy food provides in the body. Because the body is less efficient than the calorimeter and cannot metabolize all of the energy-yielding nutrient in a food completely. Cho = 4kcal/g lipid = 4 kcal/g protein = 9 kcal/g alcohol = 7 kcal/g. Usually eat foods that are higher in fat and sugar (to destress)
