What Causes a Candida Overgrowth (Thrush)? 

There are multiple, seemingly unrelated conditions that can enable Candida to grow past the normal quantity in a human body. Each person is different and the combination of factors can be unique and unpredictable.

However, knowing of all the possible pathways that Candida can use to thrive, we’re better placed in getting in front of it in order to lessen the risk and hopefully prevent an overgrowth altogether.

High carbohydrate diet feeds Candida

Western diets (Traditional English Diet, Standard American Diet, and Traditional Polish Kitchen) are al high in refined carbohydrates and starches. The basis of the traditional food pyramid have been grains like wheat and rye made into a variety of products like bread, pasta, flatbreads.

While carbohydrates themselves aren’t sweet in flavour, the body’s metabolism converts them into glucose and utilises them as primary energy source for the human body.

Carbohydrates are classified as simple or complex, depending on their chemical structure and the speed at which they are broken down and absorbed in the body. Simple carbohydrates, such as sugars, are quickly broken down and absorbed, leading to a rapid increase in blood sugar levels. Complex carbohydrates, such as starches and fibers, are broken down more slowly and absorbed more gradually, leading to a slower and more sustained increase in blood sugar levels.

Antibiotics use by disrupting gut microbiome

One of the ways in which antibiotics can contribute to a Candida overgrowth is by killing off beneficial bacteria in the body. The beneficial bacteria in the body help to maintain a balance of microorganisms and prevent the overgrowth of harmful bacteria and other pathogens, including Candida. When antibiotics kill off these beneficial bacteria, it can disrupt the balance of microorganisms and allow Candida to grow excessively, leading to an infection.

Birth Control Pills

There is some evidence to suggest that certain types of hormonal birth control methods, such as oral contraceptives and hormonal intrauterine devices (IUDs), may contribute to an increased risk of Candida overgrowth or Candidiasis. This is because hormonal birth control methods can alter the balance of hormones in the body, which can affect the balance of microorganisms in the body.

In particular, some studies have found that oral contraceptives may increase the risk of vaginal Candidiasis, although more research is needed to confirm this association. Hormonal IUDs may also increase the risk of vaginal Candidiasis, although this risk appears to be lower compared to oral contraceptives.

It is important to note that Candidiasis can be caused by a variety of factors, and it is not necessarily caused by the use of birth control alone.

Oral Corticosteroids

There is some evidence to suggest that the use of inhalers, particularly those that contain corticosteroids, may increase the risk of Candida overgrowth or Candidiasis. This is because inhalers that contain corticosteroids can suppress the immune system and alter the balance of microorganisms in the body, which can allow Candida to grow excessively.

Inhaled corticosteroids are commonly used to treat respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). While they are effective at controlling symptoms and improving quality of life, they can also have potential side effects, including an increased risk of Candidiasis.


Diabetic individuals are also more prone to developing a Candida overgrowth. This is because diabetics have high levels of sugar in their mucous membranes, making it a perfect environment and breeding place for yeast.

Weakened Immune System

The immune system helps to protect the body from infection and disease by recognizing and attacking harmful microorganisms, such as Candida. When the immune system is weakened, it can be more difficult for the body to control the growth of Candida, which can lead to an infection.


Reading the section above it’s clear to see why Candida Overgrowth is now so prevalent.