Yes, we know how it feels when you continue fasting for hours and days and finally find no results. I also went through the same phase and finally found the right path. We have an answer to your question about how many calories you burn when you fast for 24 hours. The number of calories you burn when fast depends on your body’s shape and size.

Here is the answer to your question, with proper calculation and explanation.

Fasting and Calories Burned Relationship

Fasting is often associated with weight loss, as it can help burn calories and promote a healthy lifestyle. However, it is essential to understand the relationship between fasting and calorie burning. Fasting does not directly burn calories, but it can help break down stored glycogen and fat in our bodies. So, biomass is getting converted into energy. Because these macromolecules have weight, this process can result in weight loss.

The number of calories that can be burned through fasting will depend on several factors, including the length of the fast and the individual’s metabolism. However, it is generally accepted that fasting can help boost weight loss by increasing the rate at which calories are burned.

In addition, fasting has several other health benefits, such as reducing inflammation and improving heart health. For these reasons, fasting is often recommended to lose weight and improve overall health.

The science of fasting and the calories it burns

The main goal of fasting is to burn some stored macromolecules and lose weight. In our body, two important storage molecules are stored for the future: glycogen and fat. Theoretically, when burned, 1 gram of glycogen can produce four calories (or kilocalories; both are the same), and 1 gram of fat can produce nine calories.

When you begin fasting, your stored glycogen begins to burn and run through the body. When the storage of glycogen is completed, the storage fat starts burning and produces the necessary energy.

You lose body weight equal to the amount of glycogen and fat burned. These storage macromolecules also reserve some amount of water; when they are burned, the amount of water is also lost. So, the weight you lost is the total of the storage molecules you burned and the water you earlier stored into glycogen. The water is not taken into account for the sake of simplicity and assuming an approximate value.

How many calories are burned during a 24-hour fast?

There are multiple fasting methods available. Different people follow different fasting methods. Usually, the intermitted fasting of 16/8 and 20/4 fasting methods is quite famous.

Now we will calculate how many calories you can burn if you fast for 24 hours. The entire calculation depends upon your body’s BMR, which differs for different people. But we will consider the average BMR for this calculation.

concept of BMR

BMR is “the number of calories required to run your body’s basic functions.” That is why BMR is calculated for a person in the resting position when they are doing nothing.

Usually, the average BMR is considered to be 1500 kcal (or cal) for 24 hours. This number, however, varies from person to person. If you are a girl, you can consider the average BMR of your body to be 1200 kcal for 24 hours.

That means when a male person is doing nothing but taking rest and is not consuming any food, his body can consume about 1500 kcal for 24 hours. The exact value stands for women: 1200 kcal when fasting and resting.

The number of calories you can burn by fasting for 24 hours

So, the amount of BMR for 24 hours is the number of calories burned in 24 hours when you are fasting. But, if you do some work, you may burn more calories. So, you need to know the number of calories in your work.

The formula for calculating the calories burned by 24 hours is BMR of 24 hours minus calories for work done.

You will burn a minimum of 1500 kcal if you are male and 1200 kcal if you are female when you are fasting.