Do fevers cause weight loss?

Are you one of those people who have always wondered whether a fever could be your ticket to weight loss? Well, the answer is not as straightforward as it may seem. While some believe that fevers can lead to shedding extra pounds, others argue that this claim is nothing more than a myth. In this blog post, we will take a closer look at the relationship between fevers and weight loss and find out once and for all if there’s any truth behind this popular belief. So buckle up and get ready for an interesting ride!

What is a Fever?

A fever is a temporary increase in your body temperature, often in response to an infection. fevers cause weight loss by burning more calories than usual. Most people lose only a small amount of weight when they have a fever, but some people may lose a significant amount of weight if they have a prolonged fever or are severely ill.

Fevers are classified as mild, moderate, or high depending on how much your body temperature rises. A mild fever is generally considered to be anything over 100.4°F (38°C). A moderate fever is between 101–102.2°F (38.3–39°C). A high fever is 103°F (39.4°C) or higher.

It is important to talk to your doctor if you have a fever that lasts more than 3 days or if your temperature is higher than 103°F (39.4°C).

How Does a Fever Cause Weight Loss?

When you have a fever, your body is fighting off an infection. In order to do this, your body needs to use more energy. This means that your body will burn more calories than usual. This can lead to weight loss.

Additionally, when you have a fever, you may not feel like eating as much. This can also lead to weight loss. In some cases, the fever may also cause vomiting and diarrhea which can result in dehydration and further weight loss.

It is important to note that weight loss due to a fever should not be considered healthy. While it may be temporary, it can still have damaging effects on your overall health. If you are experiencing unexplained weight loss, it is important that you speak with your doctor in order to determine the cause and create an appropriate treatment plan.

Is Weight Loss During a Fever Healthy?

When you have a fever, your body is fighting an infection. To do this, it needs energy. Your body gets this energy from the food you eat. So, when you have a fever, you may not feel like eating and may lose weight.

However, losing weight during a fever is not necessarily healthy. If you lose too much weight, it can weaken your immune system and make it harder for your body to fight the infection. Therefore, it is important to eat enough calories and get adequate nutrition while you are sick.

If you are worried about losing weight during a fever, talk to your doctor. They can help you make sure that you are getting enough calories and nutrients.

How Can Weight Loss Caused by Fevers be Prevented?

It is possible that weight loss caused by fevers can be prevented. Some tips on how to prevent weight loss during a fever include:

  • Drink plenty of fluids: Drinking lots of fluids helps to prevent dehydration, which can lead to weight loss. Make sure to drink clear liquids like water or broth, or sports drinks if you are sweating a lot.
  • Eat small, frequent meals: Eating smaller meals more often can help to increase your appetite and prevent weight loss.
  • Rest as much as possible: resting will help your body heal and can also help to prevent weight loss.

If you are concerned about losing too much weight during a fever, talk to your doctor. They may be able to give you specific advice on how to maintain your weight or may prescribe medication to help with fever-related weight loss.

What Should I Do if My Child Loses Weight Due to a Fever?

If your child has a fever, it is important to monitor their weight. A sudden drop in weight can be a sign of dehydration, which can be dangerous. If you notice your child has lost weight due to a fever, there are some things you can do to help:

  • Give them plenty of fluids to drink. Water, juice, and soup are all good options. Avoid sugary drinks like soda, as they can make dehydration worse.
  • Encourage them to eat even if they don’t feel like it. Offer foods that are easy to digest and full of nutrients, like bananas, rice, or toast.
  • Monitor their temperature and keep track of how much weight they’ve lost. If they are not gaining back the weight after a few days or if their temperature remains high, see a doctor.

If your child has a fever, it is important to pay attention to their weight and seek medical help if necessary.

Alternatives to Preventing Weight Loss Due to Fevers

There are many ways to prevent weight loss due to fevers. One way is to maintain a healthy weight through diet and exercise. Eating a balanced diet and exercising regularly can help you maintain your weight and avoid losing weight due to fever.

Another way to prevent weight loss due to fever is to take medication as prescribed by your doctor. If you are taking medication for a fever, it is important to follow your doctor’s instructions carefully. Taking too much or too little medication can lead to weight loss.

Finally, try to avoid exposure to high temperatures. If you are in an environment that is hot, humid, or both, try to stay cool and dry. Drink plenty of fluids and dress in loose-fitting, light clothing. Avoiding exposure to extreme temperatures can help prevent weight loss due to fever.


Fevers do cause weight loss, but it is important to note that this isn’t necessarily a healthy type of weight loss. When you have a fever your body is expending energy and resources to fight off the illness, which can lead to an overall decrease in your body weight. The best way to ensure healthy and sustained weight loss is through proper diet and exercise, rather than relying on high temperatures as a means of slimming down. If you are experiencing prolonged fevers or sudden changes in your bodyweight, make sure to consult with a healthcare professional for further guidance.

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