Deana and Molly have been best friends since childhood. They spend a lot of time
ID: 3507668 • Letter: D
Question
Deana and Molly have been best friends since childhood. They spend a lot of time together. They go shopping, sometimes travel together on weekends, and eat out once in a while. Recently, Molly started gaining weight and wondered why her friend, who eats the same dishes when they are out, still keeps her youthful figure.
Both Deana and Molly are 35 years old. Deana is 5 ft, 4 in tall and weighs 126 lb, and Molly is 5 ft, 7 in tall and weighs 148 lb. Molly has to watch her diet not to gain any more weight. Deana’s days are quite busy. She walks her two dogs in the morning and afternoon for almost an hour, goes to power yoga classes twice a week, walks to most of her errands, and plays tennis for two hours on Friday nights. Molly has a desk job and only goes to restorative yoga on Tuesdays and Thursdays. She does only light housework and rarely walks anywhere.
Compare the EER for both women to see why Molly is having trouble with gaining weight, whereas Deana is not. To calculate EER, use the following equation:
Adult females
EER (kilocalories) = [354 – (6.91 × age)] + (physical activity factor × [(9.36 × weight in kg) + (726 × height in meters)])
For physical activity factors (referred to as Table 14.3 in the video), use the following table:
What is the daily EER for Deana? Don't forget to convert her weight and height into metric units.
Round the number of kilocalories to the nearest whole number. During calculations, use numbers rounded to the first decimal place
What is the daily EER for Molly? Don't forget to convert her weight and height into metric units.
Round the number of kilocalories to the nearest whole number. During calculations, use numbers rounded to the first decimal place
How much (in kilocalories) can Molly increase her EER if she increases her level of physical activity just by one grade by adding a half-an-hour walk after work every day?
Round the number of kilocalories to the nearest whole number. During calculations, use numbers rounded to the first decimal place..
Physical activitylevel Physical activity
factor for men Physical activity
factor for women sedentary 1.00 1.00 low active 1.11 1.12 active 1.25 1.27 very active 1.45 1.48
Explanation / Answer
The estimated energy requirements (EER) accounts for energy intake, expenditure, age, sex, weight, height and physical activity level.
Comparing the EER for both women with similar inputs except weight, height and physical activity, following observations are made:
For Deana,
We know,
More than 60 minutes moderate activity and 60 minutes vigorous or 120 minutes moderate activity=highly active lifestyle
Therefore,
Physical activity factor=1.48
Conversion of weight from pound to kilograms,
We know,
1 pound= 0.453592 kilograms
Therefore,
126 lb=126 × 0.453592
=57.152595
=57.2 kg
Conversion of height from foot into metres,
We know,
1 foot= 12 inches
Hence,
5 ft= 5×12
=60 in
Therefore,
5 ft 4 in=60+4
=64 in
We know,
1 inch= 0.0254 metres
Therefore,
64 in= 64× 0.0254
=1.6256
=1.6 m
Hence,
EER (kilocalories) = [354 – (6.91 × age)] + (physical activity factor × [(9.36 × weight in kg) + (726 × height in meters)])
=[354- (6.91×35)]+(1.48×[(9.36×57.2)+(726×1.6)])
=[354-241.9]+(1.48×[535.4+1161.6])
=112.1+(1.48×1697)
=112.1+2511.6
=2623.7
=2624 kilocalories.
For Molly,
We know,
Typical daily living activities= sedentary lifestyle
Therefore,
Physical activity factor=1.00
Conversion of weight from pound to kilograms,
We know,
1 pound= 0.453592 kilograms
Hence,
148 lb= 148× 0.453592
=67.131616
=67.1 kg
Conversion of foot into metres,
We know,
1 foot=12 inches
Hence,
5 ft= 5×12
=60 in
Therefore,
5 ft 7 in= 60+7
=67 in
We know,
1 inch=0.0254 metres
Hence,
67 in = 67×0.0254
=1.7018
=1.7 m
Hence,
EER (kilocalories) = [354 – (6.91 × age)] + (physical activity factor × [(9.36 × weight in kg) + (726 × height in meters)])
=[354-(6.91×35)]+(1.00×[(9.36×67.1)+(726×1.7)])
=[354-241.9]+(1×[628.1+1234.2])
=112.1+1862.3
=1974.4 kilocalories
We know,
Plus 30-60 minutes moderate activity= low active lifestyle
Hence,
By adding half an hour of walk every day , Molly can increase her physical activity factor to 1.12
Therefore,
EER (kilocalories) = [354 – (6.91 × age)] + (physical activity factor × [(9.36 × weight in kg) + (726 × height in meters)])
=[354-(6.91×35)]+(1.12×[(9.36×67.1)+(726×1.7)])
=[354-241.9]+(1.12×[628.1+1234.2])
=112.1+(1.12×1862.3)
=112.1+2085.8
=2197.9
=2198 kilocalories
In order to lose weight, Molly can intake moderate energy-deficit diets, which would achieve about 0.5 kg (1 lb) weight loss per week and are based on daily dietary intake of 600 calories less than the person’s daily energy requirement.
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