Question
how many calories does a 137 pound girl need
Answers
Answered by
GPT-4o mini
The number of calories a person needs can vary significantly based on several factors, including age, height, activity level, and overall health. To give you a generalized estimate for a 137-pound girl, we can use the Mifflin-St Jeor equation, which is a commonly used method to calculate basal metabolic rate (BMR) and total daily energy expenditure (TDEE).
### Step 1: Calculate BMR
For women, the Mifflin-St Jeor equation is:
\[ \text{BMR} = 10 \times \text{weight (kg)} + 6.25 \times \text{height (cm)} - 5 \times \text{age (years)} - 161 \]
### Step 2: Convert weight to kg
137 pounds is approximately 62.1 kg.
### Step 3: Estimate TDEE
Multiply the BMR by an activity factor to estimate total daily energy expenditure:
- Sedentary (little or no exercise): BMR × 1.2
- Lightly active (light exercise/sports 1-3 days a week): BMR × 1.375
- Moderately active (moderate exercise/sports 3-5 days a week): BMR × 1.55
- Very active (hard exercise/sports 6-7 days a week): BMR × 1.725
- Super active (very hard exercise, physical job, or training twice a day): BMR × 1.9
### Example Calculation
Let's say the girl is 20 years old and 5'4" (163 cm) tall, and she is moderately active.
1. Convert height to cm: 5'4" is about 163 cm.
2. Calculate BMR:
\[ \text{BMR} = (10 \times 62.1) + (6.25 \times 163) - (5 \times 20) - 161 \]
\[ \text{BMR} \approx 621 + 1018.75 - 100 - 161 \approx 1378.75 \text{ calories/day} \]
3. For a moderately active lifestyle:
\[ \text{TDEE} = 1378.75 \times 1.55 \approx 2137.06 \text{ calories/day} \]
### Conclusion
In this example, a 137-pound girl who is 20 years old, 5'4" tall, and moderately active would need approximately **2137 calories per day** to maintain her weight. If she wants to lose weight, she might aim for a calorie deficit, and if she wants to gain weight, she would seek a caloric surplus.
Always consider consulting with a healthcare professional or a registered dietitian for personalized advice.
### Step 1: Calculate BMR
For women, the Mifflin-St Jeor equation is:
\[ \text{BMR} = 10 \times \text{weight (kg)} + 6.25 \times \text{height (cm)} - 5 \times \text{age (years)} - 161 \]
### Step 2: Convert weight to kg
137 pounds is approximately 62.1 kg.
### Step 3: Estimate TDEE
Multiply the BMR by an activity factor to estimate total daily energy expenditure:
- Sedentary (little or no exercise): BMR × 1.2
- Lightly active (light exercise/sports 1-3 days a week): BMR × 1.375
- Moderately active (moderate exercise/sports 3-5 days a week): BMR × 1.55
- Very active (hard exercise/sports 6-7 days a week): BMR × 1.725
- Super active (very hard exercise, physical job, or training twice a day): BMR × 1.9
### Example Calculation
Let's say the girl is 20 years old and 5'4" (163 cm) tall, and she is moderately active.
1. Convert height to cm: 5'4" is about 163 cm.
2. Calculate BMR:
\[ \text{BMR} = (10 \times 62.1) + (6.25 \times 163) - (5 \times 20) - 161 \]
\[ \text{BMR} \approx 621 + 1018.75 - 100 - 161 \approx 1378.75 \text{ calories/day} \]
3. For a moderately active lifestyle:
\[ \text{TDEE} = 1378.75 \times 1.55 \approx 2137.06 \text{ calories/day} \]
### Conclusion
In this example, a 137-pound girl who is 20 years old, 5'4" tall, and moderately active would need approximately **2137 calories per day** to maintain her weight. If she wants to lose weight, she might aim for a calorie deficit, and if she wants to gain weight, she would seek a caloric surplus.
Always consider consulting with a healthcare professional or a registered dietitian for personalized advice.