A 70.3 kg person eats three 38.7 g brownies with nuts. What percentage (%) of their daily basal metabolic rate

Question

A 70.3 kg person eats three 38.7 g brownies with nuts. What percentage (%) of their daily basal metabolic rate have they ingested ?




How long would it take, in minutes, for the person in the above question to walk off all the calories in the three brownies ? Walking requires energy equal to 2.5 times the basal metabolic rate.

Do NOT consider the energy needed to digest, absorb, and metabolize the snack itself, which the text describes as 10% of the ingested amount of food. Use the total amount of the energy in the three brownies in your calculation.

Answer 1

To calculate the basal metabolic rate in an accurate way, you need to know if the person is male or female, the age and how tall the person is (which would give you an idea of the BMI, as well as the fat percentage). This is important because musle and fat tissue do not have the same metabolic rate.

However, if we consider the person in question a 25-year old man, of average size (about 175cm), his basal metabolic rate would be around 1730 kcal/day (or 72 kcal/h). This changes proportionally to the height, but not drastically (http://www.runnersweb.com/running/bmr.html).

Now, not all brownies have the same amount of calories. The average, though is about 450 kcal / 100g, which means that 3*38.7g = 116.1g will give about 522.5 kcal, about 30.2% of the daily basal metabolic requirement .

While walking, the hour metabolic rate (2.5*72) will be approx 180 kcal/h, therefore, this person will need to walk for 2.9 hours or 2 hours and 54 min to burn the brownies.

Sorry, it might not be 100% accurate, because I had to improvise some of the data (height, sex, age, etc)

Answer 2

[Part 1]

(4.04)(grams of brownie)=calories of brownies
(weight of person)(24)=BMR

(calories of brownie)/(BMR)

Then multiply by 100


PART 2

(2.5)(BMR)(1/24)(1/60)= #
(calories of brownie)/# = Howlong it takes