BIOL 2P97 Lecture Notes - Lecture 4: Adipocyte, Weight Loss, Polyphagia
12 Jan 2016
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Document Summary
Work- (50%) transport across membranes, mechanical and chemical. Energy in the body: energy input (diet) = energy output. Energy input: diet- hunger, satiety, social and psychological factors. Energy in food is usually measured in kcal. 1 kilocalorie (=1 cal which is equal to 1000 calories) is the amount of heat needed to raise the temp of 1kg of water by 1 degree celcius. The caloric content of any food can be calculated by remembering 3 simple numbers: A plain bagel contains 2g fat, 7g protein, 38g carbs. 2g fat x 9 kcal/(2g fat) = 18 kcal. 7g protein x 4 kcal/(7g protein) = 28 kcal. 38 carbs x 4 kcal/(38g carbs) = 152 kcal. Basal metabolic rate (bmr): an individuals lowest metabolic rate (just so you can stay living); during sleep. Metabolic rate is often measured after a 12 hour fast in a person who is awake but resting (resting metabolic rate rmr)
