Research from the University of Oxford suggests that beverages served at 65°C or higher can significantly increase the likelihood of esophageal cancer.. These findings highlight a critical link between thermal damage to the food pipe and malignancy, while also exploring the contrasting risks of near-freezing drinks and the metabolic benefits of cooled starches.
The 65°C Threshold for Esophageal Malignancy
According to the report,the University of Oxford analyzed data from nearly one million people to establish a correlation between habitual intake of near-boiling coffee or tea and the development of cancer in the food pipe. The International Agency for Research on Cancer has classified beverages exceeding 65°C as probably carcinogenic, a warning that may also apply to solid foods served at similar temperatures.
The biological cost of these habits is steep, though potentially avoidable. Experts estimate that approximately 14 percent of these specific cancers could be prevented if consumers shifted from scalding beverages to warm alternatives. Rehan Haidry, a consultant gastroenterologist at the private Cleveland Clinic, notes that liquids are particularly dangerous because they coat the esophagus rapidly without the cooling effect provided by chewing solid food.
Why Soups and Porridge Mimic Scalding Beverages
The risk is not limited to tea and coffee; thick liquids like porridge, gravies, and soups can be equally hazardous. Dr. Marion Sloan, a GP and chair of the Primary Care Society for Gastroenterology, explains that these substances retain high internal heat even when the surface feels cool, potentially exposing the gullet to extreme thermal stress during a large gulp.
To reduce this risk, the report says Dr. Sloan recommends spreading sauces on wide plates to cool and testing a small spoonful before eating. The timing of consumption is also critical; a 2020 study in the International Journal of Cancer found that drinking tea within two minutes of pouring is riskier than waiting six mintues, with a target temperature of below 60°C being the safest benchmark.
The 7°C Trigger for Atrial Fibrillation
While extreme heat damages the esophagus, extreme cold can disrupt the heart. A 2025 study published in the Journal of Cardiovascular Electrophysiology found that foods and drinks below 7°C, such as frozen smoothies, can trigger atrial fibrillation. This irregular heartbeat is a primary risk factor for strokes,and the US-based study revealed that 51.5 percent of affected patients experienced symptoms within one minute of ingestion.
The data suggests a strong correlation between temperature avoidance and heart stability, as 86.4 percent of patients who avoided these cold items saw a reduction or total cessation of atrial fibrillation episodes. However, Dr. Lucy Hooper of Coyne Medical in London clarifies that this is a management tool for those already suffering from the condition, rather than a universal requirement for all patients.
How 24-Hour Cooling of Pasta Boosts Resistant Starch
Temperature manipulation can also provide metabolic advantages through the creation of resistant starch in potatoes, rice, and pasta. Jordan Haworth, a gastrointestinal physiologist at the Functional Gut Clinic, explains that these cooled carbohydrates escape digestion in the small intestine and instead ferment in the large intestine. This process produces short-chain fatty acids like butyrate, which trigger GLP-1 hormones to signal fullness to the brain.
The benefits of this process are durable and potentially preventative. A 2026 study in the journal Nutrients showed that cooling cooked pasta for 24 hours before reheating it significantly increases resistant starch levels without losing the metabolic edge. Furthermore, a 2017 study in the journal Nutrition found that resistant starch-enhanced muffins led to a reduction of approximately 90 calories in subsequent meals,while a 2024 Australian study suggested that butyrate may help prevent bowel cancer by triggering the death of pre-cancerous cells.
Who is Most Vulnerable to Thermal Tissue Death?
Despite the breadth of the University of Oxford and other studies, several critical gaps remain. The current reporting does not specify if certain demographics—such as the elderly or those with pre-existing esophageal conditions—are more susceptible to the cellular inflammation caused by 65°C liquids. Additionally, it remains unclear if the chemical composition of the drink, such as acidity in coffee versus the neutrality of water, alters the threshold at which thrmal damage occurs.
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