Directional selection only occurs in response to naturally occurring events.
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Answer:
Anna's total daily energy needs based, on her desired body weight and level of physical activity that will allow her to maintain her precollege body weight is <u>1120.8 kcal/ day</u>
Explanation:
The Basal Metabolic Rate or BMR is a measure of a person's ability to process energy per day. Essentially, BMR looks at how much energy a body may use in a 24 hour period by measuring the needed calorie intake.
BMR is measured via the equation:
- (Imperial) BMR = (4.536 × weight in pounds) + (15.88 × height in inches) − (5 × age) − 161;
This is the Mifflin-St Jeor formula, alternatively, the very similar Harris-Benedict Equation can be used; here, age, weight and height are the inputs required for the calculation. However, for this question we'll use the provided equation:
Anna's current weight= 121+15 lbs= 61.69 kg
...previous weight= 54.80 kg
<u> Formula for women: </u>
BMR (kcal/ day)= body weight in kg × 0.9 kcal/kg/ hour × 24 hours/day
At her current weight = 61.69 kg× 0.9 kcal/kg/ hour × 24 hours/day
=1332.5 kcal/ day
At her pre-college weight= 54.89 kg× 0.9 kcal/kg/ hour × 24 hours/day
=1120.8 kcal/ day
And going further, it may be concluded that Anna needs to eat 211.7 less calories to attain her previous weight...
