HNF 150 Lecture Notes - Lecture 23: Basal Metabolic Rate, Thyroid, Food Composition Data
23 Apr 2019
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Energy balance: energy balance = e intake e expenditure, methods to measure energy intake (2): Add up kcal values of all food and drink consumed: components of energy expenditure (3): Basal metabolic rate (bmr): the sum total of all involuntary activities that are necessary for life, except digestion and voluntary activities (heartbeat, brain activity, etc. ) Thermic effect of food (tef): increase in bmr due to eating -- energy needed for digestion, processing, storage of our food nutrients. Voluntary activities: intentional activities (walking, sitting, biking, etc. : determinants of basal metabolic rate (9), controlled by hormone produced by the thyroid gland = thyroxine. Measuring total energy expenditure: can use formulas for approximate estimates, formulas based on (3): gender, age, activity level. Or the sum of (minutes of each activity x kcals expended by that activity) Or: by laboratory assessments - pedometers, accelerometers, and more. Main reason in the u. s. = aesthetics.
