Observational study finds very hot drink consumption triples oesophageal cancer risk in adults — Evidence Review
Published in International Journal of Cancer, by researchers from University of Oxford, Cancer Research UK
Researched by
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Table of Contents
Drinking very hot tea and coffee significantly increases the risk of oesophageal squamous cell carcinoma (SCC), according to a large UK study; these findings are broadly consistent with decades of global research linking hot beverage consumption to this cancer type. Existing studies generally support the association between high-temperature drink intake and elevated SCC risk, particularly in populations with high hot beverage consumption, as confirmed by the original study's findings.
- Multiple systematic reviews and meta-analyses have shown that drinking beverages at high temperatures, rather than the specific beverage type or amount, is consistently associated with increased oesophageal cancer risk, especially SCC 1 3 5.
- Epidemiological studies from Asia and South America reinforce that both the temperature and frequency of hot drink consumption are key risk factors, and these effects are seen independently of other known risks such as smoking and alcohol 2 4 6 7.
- While some studies suggest population-level differences in risk magnitude, the overall consensus is that lowering beverage temperature and moderating consumption could reduce SCC incidence, supporting the preventive implications of the new UK research 5 7.
Study Overview and Key Findings
The relationship between hot beverage consumption and oesophageal cancer has been a subject of growing public health interest, especially as tea and coffee remain staple drinks in many societies. The new study stands out for its unprecedented scale and its focus on a Western European cohort, offering important insights beyond the high-risk regions previously studied. This research is particularly timely, as changing beverage habits and rising cancer awareness increase the relevance of modifiable risk factors.
| Property | Value |
|---|---|
| Study Year | 2023 |
| Organization | University of Oxford, Cancer Research UK |
| Journal Name | International Journal of Cancer |
| Authors | Dr Keren Papier |
| Population | Middle-aged adults |
| Sample Size | n=980,000 |
| Methods | Observational Study |
| Outcome | Risk of oesophageal squamous cell carcinoma (SCC) |
| Results | Very hot drinks triple SCC risk; 71% increase with 6+ hot drinks daily. |
The study, led by researchers at the University of Oxford and Cancer Research UK, followed nearly one million middle-aged adults in the UK over 14 years. Participants reported their preferred beverage temperature—ranging from "warm" to "very hot"—and their daily hot drink consumption. After adjusting for confounding factors, the study found that:
- Drinking beverages at "very hot" temperatures was associated with a threefold higher risk of SCC, but not with oesophageal adenocarcinoma (AC).
- Consuming six or more hot drinks daily, compared with fewer than six, resulted in a 71% increase in SCC risk, independent of temperature.
- The findings support the advice to let hot drinks cool to a comfortable temperature before consumption.
Literature Review: Related Studies
We searched the Consensus paper database, which includes over 200 million research papers, to identify related studies on hot drink consumption and oesophageal cancer risk. The following search queries were used:
- hot drinks oesophageal cancer risk
- SCC risk factors very hot beverages
- daily hot drink consumption health effects
Summary Table: Major Topics and Key Findings
| Topic | Key Findings |
|---|---|
| How does hot beverage temperature affect oesophageal cancer risk? | - Drinking hot or very hot beverages is consistently linked to elevated risk of oesophageal squamous cell carcinoma (SCC), with some studies reporting up to 2-8 times higher odds for very hot drinks 1 3 4 5 6 7. - The risk is related to temperature, not beverage type; consuming drinks above ~60-70°C is especially associated with increased risk 1 4 5 7. |
| Does the frequency and amount of hot drink consumption matter? | - High daily intake of hot drinks (e.g., >6 cups/day tea or coffee, or >1L/day mate) further increases SCC risk, often in a dose-dependent manner 2 6 7. - The combination of high temperature and high quantity has a synergistic effect, leading to multiplicative increases in risk 2 6. |
| What are the effects of hot drinks on different types of oesophageal cancer? | - Temperature and frequency of hot drinks are strongly associated with SCC, but not with adenocarcinoma (AC) 1 3 5. - Most studies find no significant link between hot drink consumption and AC; the risk is specific to SCC 3 5. |
| How do hot beverages interact with other risk factors or dietary patterns? | - Thermal injury from hot drinks adds to risks from alcohol, tobacco, and certain dietary deficiencies 2 7. - Diets rich in fruits and vegetables may offer some protective effects against SCC, while heavy meat, animal fat, and salt intake may increase risk 2 7. |
How does hot beverage temperature affect oesophageal cancer risk?
The literature consistently demonstrates that consuming beverages at high temperatures—regardless of the beverage type—raises the risk of oesophageal SCC. The new UK study's findings are in line with global research, confirming that thermal injury from hot drinks is a modifiable risk factor, and similar patterns have been observed in diverse populations.
- Multiple systematic reviews and meta-analyses show that high-temperature beverage or food intake is associated with a 1.6- to 8-fold increased risk of SCC, with risk increasing sharply above 60°C 1 3 4 5 6 7.
- A large case-control study in Iran found that drinking tea at temperatures ≥65°C, or within two minutes of pouring, was associated with an odds ratio of 8.16 for SCC compared to lukewarm or warm tea 4.
- Meta-analyses highlight that temperature, rather than beverage type or amount, is the key factor in risk elevation 1 3 5.
- The UK study extends these findings to a Western European population, demonstrating that the temperature-risk association is not limited to traditionally high-risk regions 1 3 4 5 7.
Does the frequency and amount of hot drink consumption matter?
Beyond temperature, the frequency and amount of hot beverage consumption also play significant roles in SCC risk. Studies indicate that both high temperature and frequent consumption independently and synergistically increase risk.
- Heavy mate drinkers (>1L/day), especially those consuming it very hot, face a 4-fold increased risk of SCC compared to light drinkers of cooler mate 2 6.
- The effect of frequency is often multiplicative when combined with high temperature, suggesting that the two factors together have a stronger impact than either alone 2 6.
- The new UK study found a 71% higher SCC risk for individuals drinking six or more hot drinks daily, even after adjusting for beverage temperature, supporting the dose-response relationship 2 6 7.
- These findings highlight that public health messages should address both how hot and how much people drink 2 6 7.
What are the effects of hot drinks on different types of oesophageal cancer?
The risk associated with hot beverages appears specific to oesophageal squamous cell carcinoma (SCC), with little or no effect on adenocarcinoma (AC). This distinction is important for understanding disease mechanisms and targeting prevention strategies.
- Meta-analyses and cohort studies consistently report that hot drink consumption is associated with increased SCC risk, but not with AC 1 3 5.
- The UK study directly found no association between hot drink temperature or frequency and AC risk, reinforcing the specificity of the effect 1 3 5.
- The histological specificity is likely due to the direct thermal injury affecting the upper oesophageal lining, which is more prone to SCC 1 3 5.
- This distinction is supported by global data, emphasizing the need to differentiate between SCC and AC in research and prevention 3 5.
How do hot beverages interact with other risk factors or dietary patterns?
Oesophageal SCC risk is influenced by a complex interplay of lifestyle, dietary, and environmental factors. Hot drinks contribute to this risk profile, particularly when combined with other exposures.
- Studies in Iran and South America indicate that thermal injury from hot drinks compounds the effects of smoking, alcohol use, nutrient-poor diets, and environmental exposures (e.g., polycyclic aromatic hydrocarbons, poor water quality) 2 7.
- Diets high in fruits and vegetables are linked to lower SCC risk, while high intake of meat, animal fat, and salt can increase it 2 7.
- Combined exposure to multiple risk factors can result in a more than sevenfold increase in SCC risk 7.
- The new study focuses on hot drink consumption but aligns with broader evidence showing that modifiable lifestyle factors collectively shape oesophageal cancer risk 2 7.
Future Research Questions
While the current body of evidence establishes a strong link between hot beverage consumption and SCC risk, important questions remain. Further research is needed to clarify causal mechanisms, evaluate the impact of behavioral interventions, and understand population-specific effects.
| Research Question | Relevance |
|---|---|
| Does self-reported drink temperature accurately reflect actual consumption in epidemiological studies? | Self-reported temperature is subjective; improved measurement techniques could help validate findings and assess true exposure levels 4. |
| What are the biological mechanisms underlying thermal injury-induced esophageal carcinogenesis? | Understanding how repeated thermal injury leads to cellular changes and cancer development could inform targeted prevention and treatment strategies 1 3. |
| Can public health interventions to reduce hot drink temperature lower SCC incidence in various populations? | Interventions could be tested in different cultural contexts to assess their effectiveness in reducing SCC risk, especially in high-consumption regions 2 5 7. |
| Are there genetic or biological factors that influence an individual’s susceptibility to thermal injury and SCC? | Individual differences in thermosensation or mucosal sensitivity could affect risk, as suggested by some experts, and may inform personalized prevention approaches 4. |
| How do hot beverage consumption patterns interact with other dietary and environmental risk factors for SCC? | Clarifying how hot drinks combine with smoking, alcohol, diet, and environmental exposures could help refine risk models and preventive recommendations 2 7. |