Does Sugar Cause Yeast Infections?

A donut with your coffee. A mid-afternoon chocolate fix. Ice cream after dinner. We all have our go-to sweet treats, but if you’re someone who gets frequent vaginal yeast infections, you might be wondering if sugar could be part of the problem.

The short answer? While it’s not the whole story, your diet—and especially your sugar intake– can influence your vaginal microbiome in ways that matter. Let’s get into the science (without the scare tactics).

This post is for informational purposes only and does not constitute medical advice. See full disclaimer below.

What Is a Yeast Infection?

A yeast infection (also known as vaginal candidiasis or vulvovaginal candidiasis) is a common fungal infection caused by an overgrowth of Candida, with Candida albicans being one of the main offenders¹.

Fungi like Candida albicans are not always harmful². In fact, balanced microbiomes can still contain small amounts of Candida. But when this fungus begins to multiply and overtake the vaginal flora, it can lead to uncomfortable symptoms, including:

• Vaginal itching or irritation
• Thick white vaginal discharge (often compared to cottage cheese)
• Redness or swelling around the vulva
• A burning sensation during urination or sex

Millions of people experience yeast infections each year. If you are one of them, know that you're not alone—and that there are effective ways to treat them³. Most uncomplicated vaginal yeast infections are treated with antifungal medications, either as an over-the-counter suppository or topical cream, or with a prescription oral antifungal like fluconazole.

Simple lifestyle changes, including changes to your diet, can also go a long way in reducing or even preventing recurrence.

So…Does Sugar Really Cause Yeast Infections?

Yes and no. While sugar doesn’t directly cause vaginal yeast infections, it does play a supporting role.

Here’s how sugar can contribute to yeast infection symptoms, even if it doesn’t cause it directly.

1. Fuel for Fungi

Fungi like Candida love to eat glucose⁴. This means diets high in sugar (including refined carbs that quickly convert to glucose) may create an internal environment that encourages yeast overgrowth. This is especially true when the immune system is compromised or the vaginal flora is already imbalanced due to antibiotic use, among other things.

2. The Blood Sugar Connection

People with uncontrolled diabetes or consistently high blood sugar levels face a higher risk of yeast infections⁵.

According to the Centers for Disease Control and Prevention (CDC), excess glucose can appear in vaginal secretions and serve as a food source for yeast, encouraging growth in the genital area⁶.

3. Weakened Defenses

A high-sugar diet can weaken your immune system, disrupt gut health, and increase overall inflammation throughout your body, making it harder for your body to keep candida overgrowth in check⁷.

Is This Just a Diabetes Thing?

Nope. Yeast infections linked to sugar aren’t just a concern for people with type 2 diabetes or high blood sugar⁸. Even short-term spikes in sugar intake, especially alongside other risk factors like antibiotics, hormonal birth control, douching, or wearing tight swimsuits, can throw off your balance and increase your chances of getting an infection. These imbalances may be more common during times of diet or lifestyle changes, such as summer travel or vacations.

Lifestyle Changes That May Help Prevent Yeast Infections

If you’re stuck in a cycle of recurrent yeast infections, know that you aren’t alone and there’s nothing wrong with you⁹. It’s often possible to take control of your vaginal health and end comfortable itching with a few, research-backed lifestyle changes:

• Watch your sugar intake. This doesn’t mean eliminating all sugar (don’t worry), but limiting added sugars and processed carbs may help reduce yeast overgrowth.
• Limit alcohol & caffeine. Both can contribute to dehydration and stress, which may negatively impact your immune system and microbiome balance. Alcohol is also high in sugar, which (as you now know) can further promote yeast overgrowth.
• Add vaginal probiotics to your routine. Happy V’s Prebiotic + Probiotic is made with clinically studied strains like Lactobacillus acidophilus LA-14® and Lactobacillus rhamnosus HN001™, which have been shown to support vaginal balance. In preclinical studies, Happy V’s unique blend also helped keep overgrowth of Candida albicans in check. Just be sure to talk with your doctor before beginning any new supplement!
• Choose loose bottoms & cotton underwear. Along with sugar, yeast love dark, moist areas. For this reason, avoid tight pants and synthetic underwear. This will help reduce moisture and heat in the vaginal area.
• Skip the douches. Douching not only disrupts your natural pH and increases infection risk, but it’s actually not even necessary because your vagina is self cleaning!
• Avoid scented products. As nice as they might smell, these products often get their smells from harsh chemicals that can disrupt your microbiome, which can put you at an increased risk of infection. If you want to clean your vulva, use warm water and mild, unscented soap only.
• Practice good hygiene during your menstrual cycle, after workouts, and following sexual intercourse. Change tampons or pads regularly (like, every 2-4 hours), shower after sweating, and gently clean the external genital area after sex. Keeping the vulva clean—without over-washing!—supports your microbiome and helps prevent irritation.

Can Sugar Cause BV?

While sugar is most famously linked to yeast infections, growing research suggests it might also have a say in your risk for bacterial vaginosis (BV) (aka the most common vaginal infection in women of reproductive age, per the CDC)¹⁰.

BV happens when your vaginal microbiome gets thrown off¹¹. More specifically, it happens when helpful bacteria like Lactobacilli are outnumbered by bad bacteria. And while BV isn’t caused by sugar directly, high-sugar diets may tip the balance in the wrong direction.

How? Well, one theory is that consistently elevated blood sugar levels can impact your immune system and create a more welcoming environment for bad bacteria¹². If your defenses are down, recurrence becomes more likely.

The good news is that, like yeast infections, BV doesn’t have to keep coming back¹³. In addition to talking to your healthcare provider about treatments like metronidazole or clindamycin, supportive habits like adjusting your diet and adding a targeted probiotic—like Happy V’s Prebiotic + Probiotic—can help keep your vaginal flora in check and support long-term balance.

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Final Thoughts

If you’re struggling with recurring yeast infections, you don’t have to swear off sweets forever, but knowing how sugar impacts your body gives you the power to make lifestyle choices that support your vaginal health. As with most things in the wellness world, it’s all about balance, not restriction.

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Disclaimer: This blog is for informational and educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Statements about supplements have not been evaluated by the Food and Drug Administration. For more information about vaginal infections, visit the CDC or speak to a licensed healthcare provider.