Lecture 17 - Energy Balance - Lecture 17: Energy Balance,...

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Lecture 17: Energy Balance, Growth and Body Composition Recommended Readings: From Thompson et al, The Science of  Nutrition, parts of Chapter 13.
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Important Words 2 Adipocyte Adipose tissue Appetite Basal metabolic rate Direct calorimetry Energy balance First law of thermodynamics Hunger Hypothalamus Indirect calorimetry Lean body mass Leptin Muscle Satiety Thermic effect of food  
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Lecture Outline Defining energy balance Importance of energy balance What determines energy intake What determines energy expenditure Summary 3
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Energy Balance = Energy In Energy Out (the food you eat) (expenditures) Positive :  you eat  more  energy than you  use -- gain weight Negative : you eat  less  energy than you  use  -- lose weight 4
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First Law of Thermodynamics: Conservation of Energy Energy cannot be created nor destroyed. It can only change forms Food intake – Energy Utilization = Change in stored  energy    5
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Lecture Outline Defining energy balance Importance of energy balance What determines energy intake What determines energy expenditure Summary 6
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Body Energy Stores  Short term supply  glycogen  Long term supply  fat in adipose tissue  protein in muscle Expand energy stores - fat in adipose tissue) Deplete energy stores - fat in adipose tissue used  for energy - protein in muscle used to  make new glucose Overweight Underweight 7
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Global - Prevalence of Underweight http://www.iaea.org/NewsCenter/Features/Nutrition/energyintake.html 8
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Risks for A Child Being Underweight Can be an indicator of malnutrition and  associated clinical disease   Nutritional def disease - eg Anemia, scurvey  Increased risk of infection
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Lecture 17 - Energy Balance - Lecture 17: Energy Balance,...

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