A major study published in the International Journal of Cancer reveals that consuming very hot tea and coffee triples the risk of developing esophageal squamous cell carcinoma. Led by Oxford University researchers and tracking nearly 980,000 UK participants over 14 years, the findings highlight thermal injury as a primary driver of the disease.
Here is why that matters right now.
What the Oxford Cohort Reveals About Temperature and Frequency
Led by Keren Papier, a senior nutritional epidemiologist in the population health department at the University of Oxford, the research evaluated how beverage temperature directly impacts the human body. The study tracked participants over a 14-year period, asking them to categorize their preferred drink temperatures using options like “very hot,” “hot,” “warm,” and “do not drink hot beverages.”
The results point to a stark biological divide. Drinking beverages classified as “very hot” compared to “warm” was associated with a threefold increase in the risk of esophageal squamous cell carcinoma (SCC). Interestingly, the data showed no such correlation with adenocarcinoma, the other major form of esophageal cancer. But there is a catch regarding volume: after controlling for temperature, consuming six or more hot drinks daily still drove a 71 percent spike in squamous cell carcinoma risk compared to consuming fewer than six.
“The fact that we observed a clear trend of risk across all temperature categories suggests that limiting further the temperature at which individuals consume their beverages to something well below the average for that population can avoid an even greater proportion of cases of squamous cell carcinoma,” the researchers noted.
Global Parallels: From British Teacups to South American Chimarrão
While the Oxford study drew on nearly a million participants in the United Kingdom—making it the largest analysis of its kind globally—its conclusions echo decades of international research. Previous studies across Asia, Africa, South America, and the Middle East established that consuming beverages like mate or tea at temperatures hitting 70°C or higher significantly elevates esophageal cancer rates.
In Brazil, a nation renowned for its massive coffee consumption and the regional tradition of chimarrão in the South, medical professionals have long warned about thermal injury to the digestive tract. According to oncologists, the World Health Organization (WHO) considers 60°C to 65°C the absolute upper safety limit for ingesting warm liquids. Esophageal cancer ranks among the most aggressive tumors of the digestive tract, often remaining silent until advanced stages due to the late onset of symptoms.
| Metric | Finding / Detail |
|---|---|
| Study Scale | Nearly 980,000 participants analyzed over 14 years in the UK. |
| Core Finding | “Very hot” beverages triple the risk of esophageal squamous cell carcinoma (SCC). |
| Specific Subtype Impact | No observed increase in risk for adenocarcinoma (AC). |
| WHO Classification | Classified in 2016 as “probably carcinogenic to humans” due to thermal cell damage. |
The Mechanics of Thermal Injury and Lifestyle Factors
The International Agency for Research on Cancer (IARC), an arm of the World Health Organization, designated hot beverages as “probably carcinogenic to humans” back in 2016. The mechanism is purely physical: extreme heat inflicts continuous thermal damage on the delicate epithelial cells lining the esophagus, also known as the human food pipe. Over years of repeated micro-trauma, this chronic inflammation sets the stage for cellular mutation.
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Health specialists emphasize that these risks rarely act in isolation. Tobacco use, heavy alcohol consumption, obesity, gastroesophageal reflux, and a diet lacking in fresh fruits and vegetables create a cumulative compounding effect. When paired with scalding liquids, these factors accelerate vulnerability.
Navigating Public Health Adjustments
Public health experts suggest that shifting consumer behavior requires minimal effort for maximum payoff. Simply allowing a freshly brewed cup of coffee or tea to cool down for a few minutes until it reaches a comfortable, lukewarm temperature removes the primary hazard entirely. As global health authorities weigh these latest findings from Oxford, the ultimate prescription remains remarkably straightforward: patience in the kitchen could save lives on the oncology ward.
