# Why Temperature Matters: The Science Behind Scalding Drinks
A new study suggests that drinking beverages hotter than 65 °C (149 °F) could increase cancer risk by up to three times. Researchers examined data from over 100,000 participants across Europe and Asia, tracking their beverage temperatures and long‑term health outcomes. The findings, published this month, confirm earlier warnings from the International Agency for Research on Cancer and add fresh evidence to the debate over hot drink consumption.
The research team gathered temperature logs from participants who regularly drank tea or coffee. They monitored how often each drink reached temperatures above 65 °C, then followed the cohort for a decade. During that period, the incidence of esophageal and other upper‑gastrointestinal cancers rose sharply among those who consistently consumed very hot beverages. The study controlled for smoking, alcohol use, and dietary habits, isolating temperature as the key variable.
The human esophagus is lined with delicate tissues that are vulnerable to thermal injury. Repeated exposure to high temperatures can cause chronic inflammation, DNA damage, and cellular mutations—precursors to cancer. In laboratory experiments, cells exposed to 70 °C for short bursts showed increased rates of malignant transformation. The study’s authors argue that everyday habits—like stirring coffee before it cools—can create a cumulative risk that is often underestimated.
# Can You Reduce the Risk? What Practical Steps Are Advisable?
Dr. Elena Marquez, a gastroenterologist not involved in the study, explained, „We’ve known for years that very hot drinks can damage the esophageal lining. This research quantifies that risk and shows it’s not just a theoretical concern.” The researchers also noted that the risk increase was most pronounced in populations with high baseline consumption of hot beverages, such as tea‑drinking cultures in East Asia.
The study’s authors recommend simple behavioral changes to lower exposure. First, let drinks cool to below 65 °C before sipping. Second, use a thermometer or a heat‑sensing mug to monitor temperature. Third, consider reducing the frequency of very hot drinks, especially in the morning when people tend to consume them quickly.
The International Agency for Research on Cancer
Public health experts suggest that these adjustments could cut cancer risk by up to 30 % in high‑consumption groups. However, the authors caution that other factors—such as genetics, smoking, and alcohol—continue to play significant roles. „Temperature is a modifiable risk factor, but it’s one piece of a larger puzzle,” said Dr. Marquez.
The International Agency for Research on Cancer first classified very hot drinks as „probably carcinogenic” in 2004, based on limited evidence. The new study, with its extensive sample size and longitudinal design, strengthens that classification. It also aligns with recent meta‑analyses that linked hot beverage consumption to esophageal squamous cell carcinoma. Yet, the study’s authors emphasize that the absolute risk remains relatively low for most individuals. They advise that people with a family history of esophageal cancer or pre‑existing conditions should be especially cautious.
The research underscores the importance of public health messaging around beverage temperatures. Some countries already recommend that hot drinks be served at 60 °C or lower. The new data could prompt revisions to guidelines and consumer safety standards worldwide.