**You must show your work and use appropriate units to receive full credit for y
ID: 125675 • Letter: #
Question
**You must show your work and use appropriate units to receive full credit for your answers
Christine is a 35-year old woman. She is 5’5” and weighs 184 lbs, and does not exercise. At a recent doctor’s visit, she was told that she needs to increase her physical activity and make some dietary changes in order to lose some weight because her cholesterol and blood pressure are high. Answer the following questions about Christine.
1.Calculate her BMI
BMI = weight (kg)/height (m2) ß m = meters
There are 2.2 lbs in 1 kg
(1 kg/2.2 lbs) x ______ lbs = ____ kg
**There are 2.54 cm in 1 inch and 100 cm in 1 meter
(2.54 cm/1 inch) x _____ inches = _____ cm
(1 m/100 cm) x _______ cm = _______ m
BMI = (weight in kg)/(height in m)2 ß only the bottom number is squared!
BMI = _______ (don’t forget the correct units!)
2. What is Christine’s ideal body weight range?
Women: (100 lbs for first 60 inches + 5 lbs per additional inch) ± 10%
**Weight is in lbs this time, not kg
To get the range:
_____ lbs – 10% of calculated weight =
_____ lbs + 10% of calculated weight =
3. How much weight does Christine need to lose for her weight to fall within this range?
To gain or lose weight:
** Remember: to gain or lose body weight, we need to adjust our intake by 3500 kcal (per 1 lb of change we want) over a period of time
total # kcal to add or take away/# of days = ____ kcal/day
**We’re not quite done, now we need to adjust our estimated energy requirements accordingly
4. Estimate her daily energy requirements (use her current weight)
Women: EER (kcal per day) = (354 – (6.91 x age in years)) + PA x ((9.36 x weight in kg) + (726 x height in meters))
5. For successful weight loss, it is recommended to lose no more than 1 lb per week. Based on Christine’s energy requirements calculated above, how many calories should she consume per day in order to achieve her ideal body weight? (remember, she must achieve a 3500 kcal deficit to lose 1 pound of body weight)
Explanation / Answer
Given data:
Patient’s name: Christine. Age: 35 years. Height: 5’5” representing 5 feet and 5 inches. Weight: 184 lbs. Lifestyle: Does not exercise, has high cholesterol and high BP. What is required? To lose weight by increasing her physical activity and make dietary adjustments.
1. Calculate her Body Mass Index (BMI):
Basic unit conversion (formula to be memorized):
1kg = 2.2 lbs.
1 inch = 2.54 centimetre (cm).
1 feet (1’) = 12 inches = 30 centimetres (cm).
100 cm = 1 metre (m).
1 cm = 1/100 meter.
Formula to calculate BMI: BMI = Weight (kg)/Height (m2)
Step 1: Convert lbs to Kgs:
There are 2.2 lbs in 1 kg.
Therefore, 184 lbs contains 184/2.2 = 83.636 = 83.67 Kg (rounded up)
Alternatively, (1 kg/2.2 lbs) x 184 lbs = 83.636 or 83.67 kg
Step 2: Convert feet and inches to meter:
Remember the basic formula:
1 inch = 2.54 centimetre (cm).
1 feet (1’) = 12 inches = 30 centimetres (cm).
100 cm = 1 metre (m).
1 cm = 1/100 meter.
Therefore, 5’5” representing 5 feet and 5 inches = [(5 feet x 12 inches/feet) + 5] = 65 inches.
**There are 2.54 cm in 1 inch and 100 cm in 1 meter.
So the conversion becomes, 65 inches = 65 inches x 2.54 cm/inch = 165.10 cm
Also it becomes 165.10 cm = 165.10 cm x 1/100 m/cm = 1.651 m
Alternatively, by substituting in the given formula, we get:
(2.54 cm / 1 inch) x 65 inches = 165.10 cm
(1 m / 100 cm) x 165.10 cm = 1.651 m
Step 3: Calculating BMI:
BMI = (weight in kg) / (height in m)2 ß (only the bottom number is squared!)
Therefore,
BMI = 83.67 Kg / (1.651)2 m = 30.69 Kg/m2 (by unit in the numerator remains as such and by squaring the height in the denominator the unit also gets squared). Therefore, the final unit becomes Kg/m2
BMI = 30.69 Kg/m2 with units. This represents obesity type 1 category.
2. What is Christine’s ideal body weight range?
Step 1: Ideal body weight range formula:
Women: (100 lbs for first 60 inches + 5 lbs per additional inch) ± 10%
**Weight is in lbs this time, not kg
Substituting in the formula:
For 65 inches, [100 lbs for first 60 inches + 5 lbs/additional inch x 5 additional inches] ± 10% = 125 ± 10% lbs.
Step 2: To get the range:
125 lbs – 10% of calculated weight (125 lbs) = [125 – (10% x 125)] = 112.5 lbs.
125 lbs + 10% of calculated weight (125 lbs) = [125 + (10% x 125)] = 137.5 lbs.
Therefore, the ideal body weight of Christine is in the range between 112.5 and 137.5 lbs.
3. How much weight does Christine need to lose for her weight to fall within this range?
Step 1: Calculating the required weight loss:
Current weight = 184 lbs.
Required weight = 112.5 – 137.5 lbs.
Keeping the upper limit, the desired weight loss should be
184-137.5 = 46.5 lbs.
Step 2: To gain or lose weight:
** Remember: to gain or lose body weight, we need to adjust our intake by 3500 kcal (per 1 lb of change we want) over a period of time.
That is, for 1 lb reduction in body weight, 3500 kcal dietary less intake should be made.
So, for 46.5 lb reduction: 46.5 lb x 3500 kcal/lb less intake should be made.
That is, 1, 62,750 Kcal less than the required or estimated energy requirements should be consumed to achieve her upper limit of the ideal body weight (137.5 lbs). Also to be noted that this should be done in a long-term period and not quickly.
Assuming the weight reduction of 1 lb in 1 week, 46.5 lbs weight would be reduced in 46.5 weeks or 46.5 x 7 days = 325.5 days approx. 326 days
Step 3: The formula is:
Total # kcal to add or take away/# of days = ____ kcal/day
Here,
Total kcal to be reduced is 1, 62, 750 kcal
Number of days = 326
Substituting the values in the formula,
Total kcal less than the energy requirement to be consumed is = 162750 kcal/326 days = 499.233 or 500 kcal/day less than current requirements for 46.5 lbs weight reduction.
**We’re not quite done, now we need to adjust our estimated energy requirements accordingly.
4. Estimate her daily energy requirements (use her current weight):
Women: Estimated Energy Requirements (EER) (in kcal per day) = (354 – (6.91 x age in years)) + PA x ((9.36 x weight in kg) + (726 x height in meters))
Here,
Age = 35 years
PA (physical activity) represents activities of daily living:
For sedentary lifestyle the range is 1.0 – 1.39.
For low active lifestyle the range is 1.4 - 1.59.
For active lifestyle the range is 1.6 - 1.89.
For very active lifestyle the range is 1.9 to 2.5.
According to the data given – the patient has no active exercise, she is in a sedentary lifestyle and hence the PA value range from 1.0 – 1.39.
Weight = 83.67 kg.
Substituting the values in the given formula,
EER = (354 – (6.91 x 35)) + 1.0-1.39 x ((9.36 x 83.67) + (726 x 1.651)) = 2093.92 Kcal/day
EER = 2093.3 K cal/day.
5. For successful weight loss, it is recommended to lose no more than 1 lb per week. Based on Christine’s energy requirements calculated above, how many calories should she consume per day in order to achieve her ideal body weight? (remember, she must achieve a 3500 kcal deficit to lose 1 pound of body weight).
Step 1: Knowing the basics:
For successful weight loss, 1 lb weight reduction in 1 week.
1 lb weight loss = 3500 kcal deficit (less than the required diet intake).
Step 2: Calculating the required kcal deficit and the number of weeks for optimal weight reduction with diet therapy:
For successful weight loss, 1 lb weight reduction in 1 week.
To achieve her exact ideal body weight of 125 lbs (184-125) = 59 lbs of weight reduction is required.
For 59 lbs of weight reduction, 59 weeks of weight reduction should be done. This equals approximately 413 days.
1 lb weight loss = 3500 kcal deficit (less than the required diet intake).
For 59 lbs of weight loss, 59 x 3500 kcal deficit should be done which equals 2,06,500 kcal total kcal deficit.
Therefore, 2,06,500 kcal deficit should be established to make weight reduction of 59 lbs so that she can achieve the exact ideal body weight of 125 lbs. (from answer 2).
Step 3: Calculating the kcal deficit per day for ideal body weight:
In 413 days, 206500 kcal deficit should be established.
Therefore, in one day, 206500/413 = 500 kcal deficit should be made.
That is, to achieve the ideal body weight of 125 lbs 500 kcal deficit should be made.
Step 4: K cal to be consumed per day to achieve her ideal body weight:
EER = 2093.3 kcal/day (from answer 4)
Kcal deficit to be made = 500 kcal/day (from step 3)
Finally, to achieve the ideal body weight of 125 lbs, [2093.3-500] = 1593.3 kcal/day.
The ideal dietary intake for weight reduction program should be 1593.3 kcal/day.
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