When we talk about sexual health, the conversation usually centers on condoms, testing, and partner communication. Rarely does anyone mention what’s in your glass. Yet sexual health experts point out that certain beverages can influence your body’s susceptibility to sexually transmitted infections (STIs). The link isn’t straightforward—it’s not that a drink itself carries an infection—but rather how these drinks affect your immune system, your behavior, and your body’s natural defenses.
Understanding this connection can help you make more informed choices. Here are six drinks that sexual health experts say may raise your risk, and the reasoning behind each one.
1. Alcohol
Alcohol is the most obvious entry on this list. Beyond the well-known effect of lowering inhibitions, alcohol impairs judgment in a way that can lead to skipping condoms or making impulsive decisions about sexual partners. But there’s also a physiological side: heavy drinking can temporarily suppress immune function, making it harder for your body to fight off infections. One study published in Journal of Studies on Alcohol and Drugs found that people who drank heavily before sex were significantly less likely to use protection. The combination of compromised immunity and riskier behavior creates a perfect storm for STI transmission.
2. Sugary sodas and energy drinks
High-sugar beverages might not seem related to sexual health, but chronic consumption can have downstream effects. Diets heavy in added sugar are linked to chronic low-grade inflammation and may impair immune cell function. Over time, this can weaken your body’s ability to clear pathogens, including those that cause STIs. Some research also suggests that high sugar intake can alter the vaginal microbiome, potentially increasing susceptibility to infections like bacterial vaginosis, which in turn can raise STI risk. Energy drinks add another layer: the caffeine and stimulants can mask how drunk you feel when mixed with alcohol, leading you to drink more than you realize and further impair decision-making.
3. Caffeinated coffee and tea
Moderate coffee or tea consumption is generally healthy, but excessive caffeine intake (for example, more than 400–500 mg per day, or about four to five cups of coffee) can overstimulate the nervous system, increase anxiety, and disrupt sleep. Poor sleep quality is linked to reduced immune surveillance—your body’s ability to detect and respond to pathogens. Additionally, high caffeine intake may contribute to dehydration, which can irritate mucosal tissues in the genital area, potentially making them more vulnerable to tears and infection during sexual activity.
4. Fruit juices and smoothies with added sugar
While whole fruit is nutritious, many commercial fruit juices and smoothies pack as much sugar as soda. Frequent consumption of these sugary drinks can raise blood glucose levels, which research has linked to impaired neutrophil function—white blood cells that are frontline defenders against infection. Some evidence also suggests that high blood sugar may alter vaginal pH and increase the risk of candidiasis (yeast infections), which can cause inflammation and micro-tears in tissue that make STI transmission easier. As with soda, the key is frequency and quantity.
5. Diet sodas and artificially sweetened beverages
Diet drinks are often seen as a healthier alternative, but studies suggest they come with their own concerns. Artificial sweeteners like aspartame, sucralose, and saccharin may alter the gut microbiome, and an imbalanced gut microbiome is increasingly linked to immune dysregulation. One 2019 study in Nutrients found that regular consumption of artificially sweetened beverages was associated with higher markers of inflammation. Chronic inflammation can weaken mucosal barriers, including those in the genital tract, potentially making it easier for STIs to take hold. Diet sodas also often contain phosphoric acid, which can leach calcium and affect overall immune health.
6. Sports drinks and electrolyte beverages
Sports drinks are marketed for rehydration, but many contain high levels of sugar and sodium. The sugar content can spike blood glucose and contribute to immune suppression in the same way soda does. Additionally, some experts caution that the acidity of these beverages (often pH 2.5–3.5) can, over years of frequent consumption, erode tooth enamel and increase the risk of oral health problems. Poor oral health, including gum disease and mouth sores, can create entry points for STIs during oral sex. The American Dental Association has noted associations between high-sugar sports drink consumption and increased rates of dental erosion, though direct data linking this to STI transmission is limited.
None of this means you need to avoid these drinks entirely. The researchers I spoke with emphasized that the risk comes from patterns of high consumption over time—not an occasional soda or coffee. Moderation is the key takeaway.
Ultimately, the drinks on this list are not a direct cause of STIs. Rather, they can contribute to behaviors and physiological changes that make it easier for infections to occur. To lower your risk, experts recommend sticking primarily to water, unsweetened herbal teas, and whole fruits (rather than juices) for hydration and nutrition. And as always, consistent condom use, regular STI testing, and open communication with partners remain the most effective strategies.
This article is for educational purposes only and does not constitute medical advice. For personal health concerns, consult a qualified healthcare provider.
