The number of calories burned each day is directly related to weight loss, weight gain, or weight maintenance. In order for a person to lose weight, they must burn more calories than they take in, creating a caloric deficit. But, for that, you need to know how many calories you burn each day.
In this article, we will see how we can calculate the number of calories you burn in a day.
What is a calorie?
The three main food groups: proteins, carbohydrates and fats have different caloric contents. Most food products display nutritional content, including calories. Most people think that calories have nothing to do with food and weight loss. A calorie is a unit of thermal energy. A calorie is the amount of energy needed to raise one gram of water 1°C. This measure can be applied to many different mechanisms of energy release outside the human body. For the human body, calories are a measure of the amount of energy the body needs to function.
Calories from protein, carbohydrates and fat.
Food contains calories. Each food has a different amount of calories, which means that each food has a different amount of potential energy. There are three basic types of food that make up all foods eaten by humans: carbohydrates, proteins, and fats. These three different types of foods have varying amounts of potential energy per gram.
The breakdown of calories per gram for each type of food is as follows:
Carbohydrates: 4 calories per gram
Protein: 4 calories per gram
Fat: 9 calories per gram
Calculate daily caloric expenditure
Calculating calories consumed and burned can help control weight. Various apps and websites are available to make this process easier. Being able to calculate the number of calories burned each day is essential for anyone looking to maintain, lose, or gain weight.
Knowing the factors that contribute to calorie burning can help a person modify their diet or exercise program to achieve their goal.
A recognized method for calculating the number of calories a person burns each day is the Harris-Benedict formula. Originally developed in the early 20th century, it was revised in 1984 and again in 1990 to improve its accuracy.
The Harris-Benedict formula is a relatively simple process in which a person multiplies their Basal Metabolic Rate (BMR) by their average daily activity level.
BMR is the number of calories a person burns simply by existing. BMR varies with age, gender, height, and genetics. To calculate the BMR, a person uses Meters for height, Kilos for weight, and Years for age in the following formulas:
Man = 13.7516 x Weight (kg) + 500.33 x Height (m) – 6.7550 x Age (year) + 66.473.
Woman = 9.5634 x Weight (kg) + 184.96 x Height (m) – 4.6756 x Age (year) + 655.0955.
The results of the BMR calculation are then multiplied by the person’s average daily activity. Points are awarded based on a person’s activity.
Points for activity levels are as follows:
1.2 points for a person with little or no activity
1.37 points for a moderately active person who exercises lightly 1-3 days a week
1.55 points for a moderately active person who exercises moderately 3-5 days a week
1,725 points for a very active person who exercises intensely 6-7 days a week
1.9 points for a very active person who has a physically demanding job or who engages in particularly difficult physical exercise.
When the BMR is calculated and the activity points are determined, the two scores are multiplied. The total is the number of calories burned on an average day.
For those who don’t wish to do the math themselves, there are a variety of calorie calculators available online. Most use a similar formula to calculate calories burned.
Factors Affecting Caloric Expenditure
Many factors influence the number of calories burned each day. Some of the factors that influence daily caloric expenditure are out of a person’s control, while others can be changed.
These factors are:
Age: the older a person is, the fewer calories they burn per day.
Gender: Men burn more calories than women.
The amount of daily activity: those who move the most burn more calories.
Body Composition: People with more muscle burn more calories than those with less.
Body Size: Tall people burn more calories than short people, even at rest.
Thermogenesis: This is the amount of energy the body uses to break down food.
Pregnancy: Pregnant women burn more calories than non-pregnant women.
Breastfeeding: Women who breastfeed also burn extra calories.
Sources
Harris, J.A. and Benedict, F.G. (December 1918). A biometric study of human basal metabolism. Proceedings of the National Academy of Sciences of the United States of America, 4(12), 370–373
Mifflin, MD, St. Jeor, ST, Hill, LA, Scott, BJ, Daugherty, SA, and Koh, ME (February 1990). A new predictive equation of resting energy expenditure in healthy individuals [Abstract]. American Journal of Clinical Nutrition, 51(2), 241-247
Roza, AM and Shizgal, HM (July 1984). The Harris Benedict equation re-evaluated: resting energy requirements and the body’s cell mass [Abstract]. American Journal of Clinical Nutrition, 40(1), 168–182
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how to calculate calories burned Harris–Benedict formula weightloss