Are Yerba Mate Drinks Bad For You? | The Hot Temperature

For most adults, moderate yerba mate is not linked to health problems.

Yerba mate has a reputation that rarely lands in the middle. Some call it a nutrient-rich energy boost packed with antioxidants that outperform green tea and coffee. Others point to cancer research that links it to esophageal tumors and avoid it entirely. Both camps have real studies supporting their position, which makes the question surprisingly hard to settle with a simple yes or no.

The honest answer, like most complex nutrition questions, sits somewhere between those extremes. Drinking yerba mate in moderation — roughly one daily cup made with about three grams of dried leaves — is generally considered safe for most adults based on current research. But factors within your control, especially how hot you drink it and your cumulative intake over time, may shift the health equation more than most people realize.

A South American Staple With Conflicting Research

Yerba mate comes from the dried leaves of Ilex paraguariensis, an evergreen plant native to South America where it has been brewed as a traditional tea for centuries. Unlike standard teas, mate contains caffeine and theobromine alongside a range of antioxidant compounds called polyphenols that give it a distinct nutritional profile.

Some research has linked regular yerba mate consumption to potential health benefits, including lower blood pressure, improved cholesterol profiles, and better blood sugar regulation. A 2024 review published in PubMed Central reported these as promising properties observed in animal and early human trials, though the authors noted the evidence remains preliminary and more research is needed. These are encouraging signals, not established guarantees.

On the other side of the ledger, multiple epidemiological studies have found associations between heavy, long-term mate consumption and increased rates of certain cancers, especially esophageal cancer. Polycyclic aromatic hydrocarbons (PAHs) found in the leaves and the high serving temperature have both been investigated as potential contributors. This has created a genuinely confusing picture where the same drink appears in both the health-promoting category and the possible-carcinogen category, depending on which studies you read.

Why The Risk Confusion Sticks

The conflicting research has left many drinkers uncertain whether their daily mate habit is helpful or harmful. Part of the confusion comes from the fact that the risks are tied to specific variables — preparation temperature, processing method, total quantity — rather than to the drink itself. Understanding these variables makes the picture much clearer.

• Temperature matters more than you think: Several studies suggest that drinking mate at very hot temperatures is more strongly linked to esophageal cancer risk than drinking it warm or at room temperature. Thermal injury to the esophageal lining may be the driving factor.
• PAH content varies by processing method: Traditional smoke-drying over wood fires can significantly increase polycyclic aromatic hydrocarbon levels in the leaves. Modern air-drying methods produce lower PAH concentrations, making processing method a meaningful variable.
• Caffeine content can cause side effects: Yerba mate contains comparable caffeine to coffee, roughly 80mg per cup. This can lead to insomnia, jitteriness, rapid heartbeat, or stomach upset, especially if you drink multiple cups per day.
• Short-term data looks reassuring: Drinking one daily cup made with about three grams of dried leaves is considered generally safe for up to 12 weeks, per Mayo Clinic guidance. The cancer risks appear to accumulate over years of heavy use, not weeks or months.
• Individual health history changes the equation: Conditions like GERD, anxiety disorders, or use of MAOI antidepressants can make yerba mate a less suitable choice regardless of the cancer question. Your personal context matters.

The main takeaway is that yerba mate isn’t inherently good or bad for you. The health outcome depends heavily on preparation method, serving temperature, quantity consumed, and your personal health background. When someone asks about yerba mate, the most accurate answer starts with “it depends” rather than a flat yes or no.

How Temperature and Processing Change the Risk

The Temperature Factor

The temperature of your mate may be the single most important variable in the cancer conversation. A 2009 study found that drinking very hot yerba mate was associated with a higher risk of esophageal cancer compared to drinking it at lower temperatures. More recent research has confirmed that pattern.

The International Agency for Research on Cancer (IARC) classified very hot beverages above 65°C (149°F) as probably carcinogenic to humans in 2016, based on evidence linking them to esophageal cancer. This applies to coffee, black tea, green tea, and mate alike — the temperature concern is beverage-agnostic, not specific to yerba mate itself.

Mayo Clinic notes that for most adults, a daily cup of yerba mate tea made with three grams of dried leaves is considered generally safe for up to 12 weeks. Their overview, available in their safe daily yerba mate guidance, emphasizes moderation rather than blanket avoidance as the prudent approach. This suggests the question isn’t whether to stop drinking mate but how to drink it in a way that minimizes potential risk while still enjoying the beverage.

The PAH picture adds another layer worth understanding. Several studies have found significant amounts of carcinogenic polycyclic aromatic hydrocarbons in commercially prepared yerba mate leaves, present in both hot and cold infusions. These compounds can accumulate from soil contamination, and traditional smoke-drying over wood fires increases PAH levels further. Research suggests the beverage temperature may be a stronger risk factor than PAH content alone, which is reassuring for those who drink mate warm rather than scalding.

Who Should Be Extra Careful With Yerba Mate

While moderate yerba mate is generally safe for most healthy adults, certain groups may want to be more cautious. The combination of caffeine content, PAH exposure, and temperature risk changes the equation for people with specific health conditions or medication regimens.

1. People taking MAOI antidepressants: Yerba mate contains caffeine, which can interact with monoamine oxidase inhibitors and potentially cause dangerous spikes in blood pressure. If you take an MAOI, check with your doctor before adding mate to your routine.
2. Anyone with GERD or chronic acid reflux: Caffeine relaxes the lower esophageal sphincter, which can worsen heartburn symptoms. The high temperature of traditional mate may also irritate an already sensitive esophagus, making it a double concern.
3. Those with high caffeine sensitivity or anxiety disorders: Yerba mate contains roughly 80mg of caffeine per cup, comparable to coffee. People prone to jitteriness, palpitations, or panic attacks may find mate aggravates those symptoms, especially in larger amounts.
4. Individuals with a family history of esophageal cancer: While the absolute risk is low for most people, those with genetic predisposition may want to take extra precautions regarding drinking temperature and total mate consumption over time.

For everyone else, the goal isn’t necessarily to avoid yerba mate. Understanding the variables that raise risk — temperature, quantity, preparation method — lets you make informed choices about how to enjoy it without unnecessary concern.

How to Reduce Potential Risk From Yerba Mate

Practical Changes That Matter

The most practical step you can take is to let your mate cool before sipping. Experts recommend waiting a few minutes after brewing to bring the temperature below 65°C, which is warm but not scalding. A mate and cancer explains that reducing temperature may address the primary risk factor more effectively than any other single change a drinker can make.

Choosing air-dried or unsmoked yerba mate products may also reduce PAH exposure. Traditional smoke-drying over wood fires adds carcinogenic compounds to the leaves, while modern processing methods produce mate with lower detectable PAH levels. Not all brands process their mate the same way, so checking the label or the company’s website for processing information can help you make a cleaner choice without giving up the drink entirely.

Sticking to moderate consumption — roughly one standard cup per day made with about three grams of dried leaves — keeps you within the window that current research considers generally safe. Cycling off mate periodically or alternating with lower-caffeine options like green tea can also reduce cumulative exposure without requiring complete abstinence. The overall pattern of your consumption over weeks and months matters more than any single cup.

For those who enjoy mate as part of a daily ritual, these adjustments don’t change the flavor or experience much. Cooling slightly, choosing a well-processed brand, and sticking to one cup allows you to keep the habit while addressing the research-backed concerns.

The Bottom Line

Yerba mate is not inherently bad for you, and for most people drinking it in moderation carries minimal known risk. The strongest evidence suggests the real concern is drinking it very hot over many years, rather than the drink itself. Letting it cool, choosing air-dried products, and keeping consumption moderate are simple steps that can tip the balance further toward the drink’s potential benefits.

If you have GERD, take an MAOI antidepressant, or have a family history of esophageal cancer, your primary care doctor can review your specific health situation and help you decide whether yerba mate fits into your routine.