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What Causes a Fast Metabolism

Nidhi Nangia
By Nidhi Nangia. Updated: January 16, 2017
What Causes a Fast Metabolism

For people with fast metabolism, losing and maintaining weight is much easier than others. To start with, metabolism refers to a series of chemical processes which aims at converting the food you eat into energy. The faster metabolism you have, the more calories you will burn and the lesser pounds you will accumulate. Fast metabolism is good for those who are trying to lose weight, but unwelcome for those who are trying to build body and gain fat. So, the choice is entirely yours. Although you may speed up your metabolism with exercise and diet, there are some people who already have a fast metabolism. Here at OneHowTo.com, we are going to find out what causes a fast metabolism.

You may also be interested in: How to Get a Fast Metabolism


  1. How to know if you have fast metabolism
  2. Causes of fast metabolism
  3. Disadvantages of fast metabolism

How to know if you have fast metabolism

First of all, you should know what type of metabolism you already have. Check for the symptoms of fast metabolism, which include being underweight, more hunger and frequent bowel movements.

People with a fast metabolism always have a high basal body temperature, due to which they sweat more and feel hot most of the time. Young girls with fast metabolism may have late and irregular menstrual cycles, probably due to the lack of required fat for the normal cycles. Some people may also experience fatigue, dizziness, rapid heart rate, difficulty sleeping, trembling hands and frequent mood swings. If you encounter any or all of these symptoms, you probably have a fast metabolism.

Causes of fast metabolism

There are several reasons why people have a fast metabolism:


Your genes definitely play a very important role in determining whether you have slow, fast or normal metabolism. Basically, there are three types of bodies, mesomorphs who have an athletic build, endomorphs who have a bigger body, and ectomorphs who have a thin build. Ectomorphs are know to have the fastest metabolism, due to which they have thin bodies, small shoulders, delicate frame and little muscle mass. Such people will not gain weight and put on muscle, no matter how hard they try.

Overactive thyroid gland

This condition known as hyperthyroidism is usually related to a fast metabolism. It is usually identified by nervousness, rapid heart rate, weight loss and fatigue. Your doctor may decide to take your thyroid test if you are experiencing any of these symptoms.


Smoking cigarettes can also be the reason why you may have fast metabolism. It may mess up with your metabolism and add to all the other issues smoking brings with it.


If you are stressed, it may also have affects on your metabolism and make it faster than normal. So, find ways to relieve your stress, in case you are trying to gain weight and build body.

What Causes a Fast Metabolism - Causes of fast metabolism

Disadvantages of fast metabolism

Although a fast metabolism seems to be a wish for those who are trying to lose weight, it comes as a disadvantage for those who are looking for some muscle mass. In addition to making you too lean and thin, a fast metabolism brings in more side effects, like irregular menstrual cycles, fatigue, sleeping troubles and rapid heart rate. To summarize, fast as well as slow metabolism are not ideal for your health, and it needs to keep a balance between the two.

If you have a fast metabolism it may be difficult for you to put on weight, this is why we recommend you read our article on how to gain 5 pounds with a fast metabolism.

This article is merely informative, oneHOWTO does not have the authority to prescribe any medical treatments or create a diagnosis. We invite you to visit your doctor if you have any type of condition or pain.

If you want to read similar articles to What Causes a Fast Metabolism, we recommend you visit our Healthy living category.

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