Question

Calculate the recommended energy intake below for the following individual: An 18-year old male weighing 70 kg with a moderate activity level and who is losing weight at 500 calories (kcal) per day due to his moderate activity level. You may need the following equations: 1.0 kcal/kg body weight per hour 0.9 kcal/kg body weight per hour Type your answers in the blanks using only the numbers (no units, no commas, round to the nearest whole number). (a) What is the daily energy/calorie needs for this individual? BMR The first step is to identify the BMR equation for a male, which is kcal/kg body weight per hour. Next, multiply this by kgx hours/day to calculate his BMR of kcal/day (round to the nearest whole number, no commas). Activity Multiply his BMR by the activity coefficient for moderate activity, which is % to calculate his activity level of kcal/day (round to the nearest whole number, no commas) Gain or Loss Commas). Gain or Loss Type either "subtract" or "add" into the blank: 500 kcals per day. TEF Use kcal/day (round to the % to calculate his TEF of nearest whole number, no commas). Total Energy Intake Calculate his total energy intake to be number, no commas). kcal/day (round to the nearest whole How much weight would he lose in 4 weeks (in theory)? lbs (round to the nearest tenths place, i.e. 0.1) What is his RDA for protein (g/day)? First, identify the RDA for protein, which is g/kg per day. Use the RDA to determine his requirement in protein is g/day (round to the nearest whole number).

Answer 1

The RDA for protein for this individual is approximately 56 grams per day and in theory, the individual would lose approximately 2.2 pounds in 4 weeks.

Let's calculate the daily energy/calorie needs for the individual step by step:

1. Basal Metabolic Rate (BMR):

BMR = 1.0 kcal/kg body weight per hour

BMR = 1.0 kcal/kg/hour * 70 kg = 70 kcal/hour

2. Activity Level:

Moderate activity level is 50% added to BMR.

Activity = BMR + (0.5 * BMR) = 1.5 * BMR

Activity = 1.5 * 70 kcal/hour = 105 kcal/hour

3. Gain or Loss:

The individual is losing weight, which means we need to subtract calories.

Gain or Loss = Subtract 500 kcal/day

4. Total Energy Expenditure (TEE):

TEE = (BMR + Activity) - Gain or Loss

TEE = (105 kcal/hour) - 500 kcal/day

Now, let's calculate the total energy intake for the individual:

5. Total Energy Intake:

Total Energy Intake = TEE + Thermic Effect of Food (TEF)

TEF is typically estimated to be around 10% of the TEE:

TEF = 0.10 * TEE

Total Energy Intake = TEE + TEF

Calculate TEE and TEF:

TEE = (105 kcal/hour) - 500 kcal/day = 105 kcal/hour - 500 kcal/day = -395 kcal/day

TEF = 0.10 * TEE = 0.10 * (-395 kcal/day) = -39.5 kcal/day

Now, calculate Total Energy Intake:

Total Energy Intake = TEE + TEF = (-395 kcal/day) + (-39.5 kcal/day) = -434.5 kcal/day

So, the individual's total energy intake is approximately -435 kcal/day, which means they are in a caloric deficit.

Next, let's calculate the weight loss in 4 weeks:

Weight Loss = (Caloric Deficit per day) * (Number of days in 4 weeks) / (Calories per 1 kg of body weight)

Calories per 1 kg of body weight is approximately 7700 kcal/kg (the average energy content of 1 kg of body fat).

Weight Loss = (-435 kcal/day) * (4 weeks * 7 days/week) / 7700 kcal/kg ≈ -0.99 kg

Now, convert the weight loss from kilograms to pounds:

Weight Loss ≈ -0.99 kg * 2.20462 lbs/kg ≈ -2.19 lbs

So, in theory, the individual would lose approximately 2.2 pounds in 4 weeks.

Finally, let's calculate the Recommended Dietary Allowance (RDA) for protein:

RDA for protein = g/kg per day

RDA for protein = 0.8 g/kg per day * 70 kg ≈ 56 g/day

Answer 2

(a) The Daily Energy/Calorie Needs is 4011.2 kcal/day

(b) The Weight Loss in 4 Weeks is 4 lbs

(c) The RDA for Protein is 56 g/day

Let's calculate the recommended energy intake step by step:

(a) Daily Energy/Calorie Needs:

`\[ BMR = 1.0 \, \text{kcal/kg body weight per hour} * 70 \, \text{kg} * 24 \, \text{hours/day} \]`

`\[ BMR = 1.0 * 70 * 24 = 1680 \, \text{kcal/day} \]`

`\[ Activity = \text{Activity coefficient (for moderate activity)} * BMR \]`

`\[ Activity = 0.9 * 1680 = 1512 \, \text{kcal/day} \]`

`\[ Gain \, or \, Loss = \text{Add or Subtract} \, 500 \, \text{kcal/day} \]`

`\[ TEF = 0.1 * (BMR + Activity) \]`

`\[ TEF = 0.1 * (1680 + 1512) = 319.2 \, \text{kcal/day} \]`

`\[ \text{Total Energy Intake} = BMR + Activity + Gain \, or \, Loss + TEF \]`

`\[ \text{Total Energy Intake} = 1680 + 1512 + 500 + 319.2 = 4011.2 \, \text{kcal/day} \]`

(b) Weight Loss in 4 Weeks (in theory):

`\[ \text{Weight Loss} = \left( \frac{\text{Gain or Loss}}{\text{3500 kcal/lb}} \right) * \text{Number of Days} \]`

`\[ \text{Weight Loss} = \left( (500)/(3500) \right) * 28 \]`

`\[ \text{Weight Loss} = 4 \, \text{lbs (rounded to the nearest tenth)} \]`

(c) RDA for Protein:

`\[ \text{RDA for Protein} = \text{RDA (g/kg per day)} * \text{Body Weight (kg)} \]`

`\[ \text{RDA for Protein} = 0.8 * 70 = 56 \, \text{g/day} \]`

In summary, for the given individual:

• Daily Energy/Calorie Needs: 4011.2 kcal/day
• Weight Loss in 4 Weeks (in theory): 4 lbs
• RDA for Protein: 56 g/day