The Link Between Heat and Health
The conversation around hot drinks and cancer isn't about the tea or coffee itself, but its temperature. The International Agency for Research on Cancer (IARC), a part of the World Health Organization, has classified drinking beverages hotter than 65°C
(149°F) as “probably carcinogenic to humans”. This conclusion is supported by multiple studies, including a major new one from the University of Oxford, which found that people who prefer their drinks “very hot” could have a significantly higher risk of developing esophageal squamous cell carcinoma (ESCC), a specific type of cancer affecting the food pipe. This type of cancer is notably more common in parts of Asia, including India, making this research particularly relevant for our population. The key takeaway is that the risk is not tied to the drink, but to the heat itself.
How Hot Is Too Hot?
The critical temperature flagged by scientists is 65° Celsius (149° Fahrenheit). To put that in perspective, water boils at 100°C, and a freshly brewed coffee or tea is often served between 70°C and 85°C. While you don't need a thermometer for every cup, a simple rule of thumb is to avoid drinking anything that feels scalding or causes you to sip with extreme caution. If the cup is too hot to hold comfortably or the liquid burns your tongue, it is almost certainly too hot for your esophagus. The advice from health experts is straightforward: just let it cool down. Waiting a few minutes after pouring can bring the temperature down to a safer level, generally below 60°C. This simple pause is enough to significantly reduce the potential risk.
Understanding the Science of Thermal Injury
The concern arises from a mechanism known as thermal injury. When you repeatedly consume scalding hot liquids, you are causing low-grade burns to the delicate lining of your esophagus. Your body constantly works to repair this damage by replacing the injured cells. Over a long period, this chronic cycle of injury and repair can increase the chances of errors occurring during cell regeneration. These errors can lead to the growth of abnormal cells, which may eventually become cancerous. Think of it like a repeatedly scraped knee that never fully gets to heal. While one hot drink won't cause cancer, a long-term habit of drinking beverages at very high temperatures creates a state of chronic inflammation that makes the esophagus more vulnerable.
Other Major Risk Factors
While temperature is a notable factor, it's crucial to see it in the context of overall health. For esophageal cancer in India, other lifestyle factors play a significant and often larger role. The most well-established risk factors include tobacco use (both smoking and chewing), excessive alcohol consumption, and poor nutrition. Some studies suggest the risk from hot drinks is particularly elevated when combined with smoking or drinking alcohol. Therefore, while letting your chai cool is a wise and simple preventive step, addressing these other major risk factors remains paramount for reducing your overall cancer risk. Maintaining a healthy weight and eating a diet rich in fruits and vegetables are also protective measures.
The Bottom Line: Enjoy Your Brew Safely
This research is not a call to give up your favourite daily ritual. Coffee and tea, when consumed at safe temperatures, are not linked to this risk and may even offer other health benefits. The message is simple and practical: practice patience. Pour your drink and give it a few minutes to cool down before you start sipping. Turn this waiting period into a mindful moment—a chance to pause and breathe before enjoying your beverage. By making this small adjustment, you can continue to savour every drop without the worry, ensuring your comforting habit remains a healthy one for years to come.
