Energy Balance Study Questions

Energy Balance Study Questions - Energy Balance Study...

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Energy Balance Study Questions Energy What do we mean by the conservation of energy? Energy is neither created nor destroyed but it does change form. What is the ultimate source of all biological energy? What is the process that converts this energy into biological energy? What chemical does it require? What is its product? The ultimate source of all biological energy is sunlight, and solar photosynthesis is the process that converts it all. The product is heat. Units of energy What units do we use to measure energy? Kilocalorie=calorie Food sources What are the four sources of energy? How many kcals per gram do each of them yield? Which one is not an essential nutrient? Carb= 4 kcal/gram Protein= 4 kcal/gram Fat= 9kcal/gram Alcohol= 7 kcal/gram. Alcohol is not an essential nutrient. Energy balance What do we mean by energy balance? What is the basic equation of energy balance? Energy intake=energy expenditure. The amount of energy you take in should be the amount of energy you releae. What is negative energy balance? Positive energy balance? Give an example of each. Negative energy balance is that you are losing weight and possibly underweight. Positive energy balance is that you are gaining weight and possibly obese. Energy usage Basal Metabolic Rate (BMR) What is BMR? What sort of activities or processes does it consist of? Is it under our voluntary control? Can we change it if we want to?
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It is energy expenditure through involuntary activity such as heart, breath, chemical reaction. It is going on all the time no matter what our activity level is. In the average person, what percentage of total energy expenditure is BMR? 2/3 of our energy is BMR Physical activity Compare the amount of energy spent in physical activity in an average person to BMR. Which is greater? Sedentary activity is 20-40% greater than BMR and Light activity is about 55- 65% greater than BMR . Compare the amount of energy spent in physical activity in a very active person to BMR. Which is greater? Heavy activity is 80-100% greater than BMR. About how many calories do you burn in an hour of sitting? Walking? Cycling? Running? sitting=25, running=1000-1500 Thermic Effect of Food (TEF) What is TEF? TEF is the Thermic Effect of Food. It is the energy cost of use. What sorts of processes create TEF? Absorption, transportation, storage, and digestion. How much of our total energy expenditure goes to TEF? 10% of total intake goes to TEF. Underweight Do extremely underweight people have better or worse longevity than average? Why might this be? Extremely underweight people have better longevity than average, because they
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Energy Balance Study Questions - Energy Balance Study...

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