Concept explainers
Introduction:
A calorie is an energy unit. In nutritional terms, calories refer to the energy people get from their food and drink and the energy they use in physical activity.
Answer to Problem 1RAC
The correct answer is option (d). A pound of body fat contains 3500 kcal.
Explanation of Solution
Explanation/justification for the correct answer:
Option (d) A pound of body fat contains 3500 kcal. A kilocalorie is an energy unit and is used to describe the energy used by the body. A pound of body fat is equal to 3500 kcal energy. That is why removing 500 kcal per day from the diet help an individual to lose one pound in a week. So, the correct answer is option (d).
Explanation for incorrect answer:
Option (a) A kilocalorie is the amount of energy required to raise the temperature of 1g of water 1° C. A single calorie is energy necessary to raise the temperature of one kilogram by 1-degree Celcius. It is 1000 times more needed to raise the temperature of 1 gram. So, this is an incorrect option.
Option (b) There is 9 kcal in a gram of protein. It has been calculated that 4 kcal of energy is present in one gram of calorie. So, this is an incorrect answer.
Option (c) There is 4 kcal in a gram of lipids. A gram of lipid has 9 kcal of energy, not 4. Therefore, this statement is wrong.
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Chapter 25 Solutions
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