Como Calcular Calorias Para Perder Peso

Losing weight through diet and exercise requires understanding your calorie needs. This guide explains how to calculate your daily calorie requirements and create a healthy deficit for weight loss.

What are calories?

Calories are units of energy that come from the food and drinks you consume. Your body uses these calories for various functions, including:

Basal metabolic rate (BMR) - energy needed at rest
Physical activity
Thermic effect of food - energy used to digest and process food

To lose weight, you need to consume fewer calories than your body burns through daily activities and metabolism.

BMR calculation

The Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic functions at rest. There are several formulas to calculate BMR:

Harris-Benedict Equation (for adults)

For men: BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age in years)

For women: BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age in years)

Note: These formulas are estimates. Individual variations can occur due to genetics, muscle mass, and overall health.

TDEE calculation

The Total Daily Energy Expenditure (TDEE) accounts for your BMR plus calories burned through physical activity. Multiply your BMR by an activity factor:

Activity Level	Activity Factor
Sedentary (little or no exercise)	1.2
Lightly active (light exercise 1-3 days/week)	1.375
Moderately active (moderate exercise 3-5 days/week)	1.55
Very active (hard exercise 6-7 days/week)	1.725
Athlete (intense exercise daily)	1.9

TDEE = BMR × Activity Factor

Creating a calorie deficit

To lose weight, create a deficit by consuming fewer calories than your TDEE. A safe deficit is typically 500-1000 calories per day. For example:

If your TDEE is 2500 calories, aim for 2000-2200 calories per day
This allows for weight loss while maintaining muscle mass

Consult a healthcare professional before starting any weight loss program, especially if you have health conditions or are pregnant.

Example calculation

Let's calculate the calories for a 30-year-old woman who is 165 cm tall, weighs 60 kg, and has a moderate activity level:

Calculate BMR: 447.593 + (9.247 × 60) + (3.098 × 165) - (4.330 × 30) = 1,350 calories
Calculate TDEE: 1,350 × 1.55 = 2,092.5 calories
Create a deficit: 2,092.5 - 500 = 1,592.5 calories/day

This woman should aim to consume approximately 1,593 calories per day to lose weight while maintaining her activity level.

FAQ

How many calories should I eat to lose weight?: To lose weight, consume 500-1000 calories fewer than your TDEE. For example, if your TDEE is 2500 calories, aim for 2000-2200 calories per day.
Is it safe to eat 1200 calories a day?: Eating 1200 calories daily may lead to muscle loss and nutrient deficiencies. It's important to consult a healthcare professional before starting any extreme diet.
How long does it take to see results?: Weight loss results vary by individual, but most people see noticeable changes within 1-4 weeks of a consistent calorie deficit.
Can I lose weight without counting calories?: While possible, tracking calories provides more precise control over your intake. Portion control and mindful eating can also help create a deficit.
What happens if I eat too few calories?: Eating too few calories can lead to muscle loss, nutrient deficiencies, fatigue, and a slower metabolism. It's important to maintain a balanced diet.