HPED 2507 Lecture 6: Energy Balance
6 Oct 2016
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Document Summary
Calories are a measurement for energy contained in food. Heat required to raise temperature of 1 kg of water 1oc. Calorie or the kcal are often used interchangeably. Change in energy stores = energy in-energy out. Excess energy = fat deposit in adipose tissue. Over a year (365 days) a consistent positive or negative daily energy balance of 50 kcal/day could result in a weight gain or loss of ~ five pounds. Sum total of energy expended on all of the involuntary activities needed to sustain life. Excludes digestion: voluntary activities, thermic effect of food. 5%-10% of a meal"s energy is expended in stepped-up metabolism in the 5+ hours after a meal. Basal metabolism uses energy for: breathing, heart ; body temp; tissue renewal; activities to sustain life; growth. Factors that affect bmr: age, growth, body composition (muscle mass, height, physical activity, health status (fever, stress, environmental temperature, fasting/starvation, genetics.
