Your subject is a 26 year old male who weighs 163 pounds and is 28.5 % body fat. His blood glucose is 90 mg/dl, his VO2 is 0.3 L/min and his RER is 0.92. How many kcal of fat does this subject have in stored in their body? 

To calculate the number of kilocalories (kcal) of fat stored in the body, we can follow these steps:

### Step 1: Calculate the Total Fat Mass
- The subject weighs 163 pounds.
- Body fat percentage is 28.5%.

The fat mass is calculated as:
\[
\text{Fat Mass} = \text{Body Weight} \times \left(\frac{\text{Body Fat Percentage}}{100}\right)
\]
\[
\text{Fat Mass} = 163 \, \text{lbs} \times \left(\frac{28.5}{100}\right) = 46.455 \, \text{lbs}
\]

### Step 2: Convert Fat Mass to Kilograms
Since fat mass is usually considered in kilograms for metabolic calculations:
\[
\text{Fat Mass (kg)} = 46.455 \, \text{lbs} \times \left(\frac{1 \, \text{kg}}{2.20462 \, \text{lbs}}\right) = 21.073 \, \text{kg}
\]

### Step 3: Convert Fat Mass to Kilocalories
The energy stored in 1 kg of fat is approximately 7700 kcal.

\[
\text{Stored Energy} = 21.073 \, \text{kg} \times 7700 \, \text{kcal/kg} = 16225.21 \, \text{kcal}
\]

So, the subject has approximately **16,225 kcal** stored as fat in their body.

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Would you like more details or have any questions? Here are some related questions you might find interesting:

1. How do factors like diet and exercise influence body fat percentage?
2. What is the significance of the Respiratory Exchange Ratio (RER) in metabolism?
3. How does blood glucose level relate to energy metabolism?
4. What is VO2 and how does it reflect aerobic fitness?
5. How many kcal of carbohydrates does a person typically store in their body?

**Tip:** Regular physical activity, especially cardiovascular exercise, can help reduce body fat percentage and improve overall health.

Learn how to calculate the energy stored in fat in the body of a 26-year-old male with specific body composition data. This problem involves converting body weight, body fat percentage, and fat mass into kilocalories. Suitable for advanced learners and professionals interested in metabolic calculations.

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