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15 December, 06:33

In order to lose weight, energy expenditure must exceed energy intake. negative energy balance occurs when the body is using more energy than it is taking in. bmr, or basal metabolic rate, is the main component of energy expenditure. this is the number of calories burned that is needed for basic bodily functions, like pumping blood through veins, enzyme production, cell turnover, and breathing, but does not include digestion. a bmr for an average, healthy adult is between 1200 kcal and 1800 kcal per day. in order to lose 1 lb of weight, a negative balance of 3500 kcal must occur. arthur is a 20-year-old student who gained 12 lb since becoming a college student 2 years ago; for the past 6 months, his weight has stabilized. now he is interested in losing those 12 lb in 2 months. arthur consumes 3000 kcal per day. in order to lose 12 lb in 8 weeks, arthur will need to:

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  1. 15 December, 08:24
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    Arthur will have to expend the energy that is stored in the 8-week period, and we may calculate this using the provided information.

    Total fat stored = 12 lb

    Total energy = 12 * 3500 = 42,000 kcal

    Per week, he has to have a negative balance of:

    42,000 / 8 = 6,000 calories

    First, we write the daily input:

    3,000 kcal

    Output:

    1,800 kcal (basal metabolic rate)

    Negative balance:

    6,000

    Burned:

    b

    Now, we may use the equation:

    Input = deficit + output + burned

    burned = 3,000 - 6,000 - 1800

    Arthur must burn a total of 4,800 kcal daily if he wishes to lose that much weight in the given amount of time.
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