Can you burn more calories when you have a fever? Many people in Perth have asked this question, especially since your body is working harder to fight off the infection, which requires more calories. Let’s see how it happens and how many additional calories may be burned in a day if someone has a fever.
How Many KJ a Day to Lose Weight?
When trying to lose weight, paying attention to a person’s KJ or kilojoules is essential. Two things to consider are the number of kilojoules taken in via eating and the burned kilojoules through exercise. Both of these are important. The recipe is simple but very hard to follow. A person must consume fewer kilojoules and burn more.
How Many Kilojoules Should I Burn a Day?
“How many KJ burned per day will aid in weight loss?” Studies suggest that people must burn 2,100 kilojoules more than they consume daily. It is recommended that a person consumes over 8,000 kilojoules a day. So, either a person burns 10,100 kilojoules through exercise, or the daily consumption can be lowered via diet so that the amount of exercise can also be decreased.
How many kilojoules per day does a woman need? Whether it be a man or woman, the recipe stands: Burn more calories than you consume. Apart from exercising, are there other ways to burn more calories? Does being sick help? Let’s find out.
Do You Burn More Calories When You Are Sick?
Why do you lose weight when sick? When you have a fever, your metabolism increases since your body raises its temperature. This is the immune system’s way of trying to beat the bugs. When there is an increased metabolism, there is an increase in calories being burned, according to Scientific American. Some people ask, “Do you burn more calories when sick with COVID?” In this case, the body fights off a fever, increasing burned calories.
Why does the Body Temperature Rise when there is a Fever?
Nurofen states that fever is, in fact, the body’s weapon against infection. One of its symptoms is a high body temperature, which occurs to help the body fight the bacteria or viruses causing the infection. When these enter the body, the immune system releases chemicals that make the hypothalamus increase the body temperature higher than usual.
What is the Hypothalamus?
The hypothalamus is the area of the brain that controls the following:
- Temperature.
- Hunger.
- Thirst.
According to Hormones Australia, it is found at the brain’s base and connected to the pituitary gland by a stalk made of nerves and blood vessels. If there are no bacteria or viruses in the body, the body’s temperature is set to normal.
What is the Normal Body Temperature?
According to Health Direct, a normal body temperature is within 36-37°C. However, it may be affected by the following factors:
- Age.
- Physical activities were done before measuring the body temperature.
- Time of the day.
- How the body temperature was done.
The same source stated that a fever may occur if one’s body temperature is 38°C or higher.
How is Body Temperature Measured?
Measuring the body’s temperature may be done with the use of the following:
- Glass thermometer.
- Battery-operated tympanic (ear) thermometers.
- Infrared forehead thermometers.
- Fever strip thermometers.
- Digital thermometer.
The last one may be the most commonly used to detect a fever. It may also be added to first aid kits so appropriate first aid practices can be applied immediately.
Why Does Fever Cause an Increased Metabolism?
According to LibreTexts, once the fever increases the body’s temperature, there is an increased rate of enzyme reactions and metabolism. These occur to do the following:
- Increase the production and activity of phagocytes.
- Speed up the multiplication of lymphocytes.
- Increase the rate of antibody and cytokine production.
- Increase the rate at which leukocytes are released from the bone marrow into the bloodstream.
- Speed up tissue repair.
All of these are how the immune system fights an infection.
How Many Calories Are Burned When There is a Fever?
Mel Magazine cites that in every 0.5°C increase in body temperature, your basal metabolic rate increases by around 7%.
What is a Basal Metabolic Rate?
Also known as the BMR, it is the rate at which the body calories (energy) while at rest to perform vital functions such as:
- Breathing.
- Keeping the body warm.
- Heart rate.
- Brain function.
There is no uniform BMR for all persons, depending on many factors.
What Factors Affect the BMR?
The BMR may be affected by:
- Muscle mass.
- Age.
- Body size.
- Gender.
- Genetics.
- Diet.
- Physical activity.
- Hormonal factors.
- Environmental factors.
Since these may change from time to time, BMR may also vary throughout the day, the week, the month, or the year. However, an average BMR for men and women has still been identified.
What is the Average BMR?
Better Health states that the BMR, measured in kilojoules (kJ), is estimated at an average of around 7,100 kJ/day for men and 5,900 kJ/day for women.
What are the Average Calories Burned per Day?
Kilojoules (kJ) may be converted to calories, and according to the Calculator Site, it is done with the formula kJ = calories (kcal) × 4.184. So 91 kJ to calories is around 21.7 calories, for example. So, with the above-mentioned average BMR, it is:
- Men = at least 1,696.94 kcal/day
- Women = at least 1410.13 kcal/day
Remember that these are only for performing vital functions. Calories needed to perform other tasks, such as walking, exercising, talking, etc., are not yet accounted for.
What is the New BMR When There Is Fever?
If body temperature is at 38°C if there is a fever, there is at least a one °C increase, therefore:
- Men
-7,100 kJ/day + 14% of BMR = at least 8,094 kJ/day BMR if there is a fever. - Women
-5,900 kJ/day + 14% of BMR = at least 6,726 kJ/day BMR if there is a fever.
This means that for men, an additional 994 kJ/day is added, while it is 826 kJ/day for women when there is a fever. 994kJ to cal is roughly 237 calories.
How Many Additional Calories Are Burned When there is a Fever?
Using the Calculator Site, it is:
- Men: 237.57 calories/day
- Women: 197.42 calories/day
Calculations are still based on the average BMR for men and women mentioned above.
Does Fever Cause Weight Loss?
As per the sample calculations above, an additional number of calories burned with a fever. These may not be likely “eaten back” by someone with a fever as there may be a loss of appetite and tiredness. According to the Mayo Clinic, when someone eats fewer calories than the average required per day, he/she may end up losing weight. It may just be one of the many effects of fever that may be unhealthy. The question now is, do you need more calories when sick? Apart from the potential weight loss, the body needs more calories to recover and fight off infections.
What are the Possible Effects of Fever?
Aside from a possible unintentional weight loss, fever may also lead to the following:
- Febrile Convulsions.
- Dehydration.
- Severe headache.
- Skin rash.
- Stiff neck.
- Vomiting.
- Shivering.
All of these, including the fever itself, may be treated with first aid. It is just one of many reasons why taking a first aid course is beneficial. If it persists, a check-up is advised, as it may be a symptom of a serious sickness or disease, like COVID-19.
What is the First Aid for Fever?
The first aid response to fever may be:
- Drinking plenty of water to avoid dehydration.
- Dressing in lightweight clothing.
- Use a light blanket if you feel chilled until the end of the chill.
- Take paracetamol or medicine as prescribed by a doctor.
On the other hand, first aid management for the above-mentioned possible effects of fever may be learned from a first aid course at 123C Colin St West Perth 6005.
Conclusion
You can burn more calories when you have a fever since it increases your metabolism. This is an effect of performing additional functions in the body to fight bacteria and viruses. Fever may also cause a loss of appetite and tiredness, leading you to eat less than your usual or average daily food intake.
When this happens, a person consumes fewer calories than what the body requires, which may lead to weight loss. It is one of the possible effects of fever that may be unhealthy and may need to be responded to with first aid. If a high fever persists, it may be a symptom of another serious sickness or disease, so going for a check-up is advised.