PEDS334 Lecture Notes - Calorimeter, Energy Density, Joule
21 Nov 2012
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Body weight regulation: 2 individuals with similar food intakes and levels of physical activity may defend different settling points (ex. Nature vs. nurture: although genetics has a strong influence on body fat levels, environment seems to be driving the epidemic. Increased energy intake: large-portioned, fast, energy-dense, inexpensive food: decreased energy expenditure: jobs and daily living require less physical labour combined with increased opportunity for sedentary activity (tv, video, computers, iphones, ipads) Its easier to eat energy dense foods and our lives are less energy demanding these are some of the causes for the imbalance in energy balance. Energy (kcal) provided from foods ingested: kcal is the amount of energy needed to increase 1 g of water by 1 degree celsius. How is it measured: direct calorimetry: burn food in the bomb calorimeter and see the increase in water temperature, computer software (food processor) Energy intake: total kcals ingested is the most important factor in energy intake.
