Question

Given: 3500 kcal in 1 pound of fat

BMR = weight (in kg) × 1 kcal/kg × 24 hours
BMI = weight (kg)/height (m²)
3300 kcal = energy needed to maintain Sam's weight
RDA for protein is 0.8 g protein/kg body weight
To convert lbs to kg: weight in pounds/2.2 lbs/kg.
Example: BW 160 lbs/2.2 lbs/kg = 72.7 kg or 73 kg

Sam is 24 years old, weighs 190 lbs (rounded to kg), and is 6'0 tall (1.8 meters) tall. Sam is active, walking about an hour a day 4 to 6 days a week.

What is Sam's energy needs at rest (BMR)?

a) 1540 kcal
b) 1780 kcal
c) 2000 kcal
d) 2250 kcal

Answer 1

Sam's energy needs at rest (BMR) calculate to 2064 kcal/day, but since that is not an answer choice and rounding to the nearest option, the closest correct value is 2250 kcal/day.

Step-by-step explanation:

To calculate Sam's energy needs at rest (BMR), we first need to convert his weight from pounds to kilograms. Since 1 pound is equivalent to 0.453592 kilograms (or roughly 2.2 pounds per kilogram), Sam's weight of 190 lbs is equal to approximately 86.2 kg (190 lbs / 2.2 lbs/kg = 86.36 kg, rounded to 86 kg for this calculation).

Using the given formula for BMR, which is the weight in kilograms times 1 kcal/kg times 24 hours, Sam's BMR is calculated as follows: 86 kg × 1 kcal/kg × 24 hours = 2064 kcal/day. However, since the options provided round to the nearest tens, the closest option to Sam's actual BMR is 2080 kcal/day, which is not listed in the options provided. Therefore, based on calculations with the given formula and Sam's weight, none of the options (a) 1540 kcal, (b) 1780 kcal, (c) 2000 kcal, or (d) 2250 kcal) are the precise caloric needs of Sam at rest.

However, since we are required to select the best available option, the closest correct value is (d) 2250 kcal.