Drinking coffee may raise your risk of esophageal cancer… but only if it’s piping hot, study claims
- Scientists say waiting for cups of coffee and tea to cool may reduce cancer risk
- Hot liquids may burn cells in the food pipe, which can turn them cancerous
- Study suggests drinking coffee does not increase risk of other cancer types
Drinking coffee may raise your risk of cancer… but only if it’s piping hot, research suggests.
Scientists think it’s because hot liquids damage tissues in the esophagus — also known as the food pipe.
It means, in theory, tea lovers could also be at risk.
Therefore, people should wait for their cups of coffee or tea to cool down before drinking them, experts advise.
Coffee is one of the most widely consumed drinks worldwide, but there has been mixed evidence on its health effects.
Some studies have suggested the beverage cuts the odds of getting cancer, while others — including the World Health Organization’s cancer research panel — have found the opposite.
People who are genetically more likely to drink coffee may have an increased risk of developing esophageal cancer but not other cancer types, a study claims [stock image]
BENEFITS OF DRINKING COFFEE
Caffeine has been deemed safe for consumption in doses of up to 400 mg per day for the general population.
Studies suggest it can have a variety of health benefits, including combating liver disease and type two diabetes.
Research has even suggested it could even help people live longer.
It is the world’s most widely consumed stimulant and reports show it can boost daily energy expenditure by around five per cent.
Researchers have said combining two to four daily coffees with regular exercise would be even more effective at keeping the weight off.
A 2015 study showed just a couple of cups a day could help millions of dieters stay trim once they have achieved their desired weight.
The truth is murky, however, because of how older experiments have been carried out, scientists say.
Previous research often compared drinking habits against the onset of conditions such as esophageal cancer.
But this has been unable to prove whether drinking coffee itself is responsible or if other lifestyle factors common among fans of the beverage are at play.
Cambridge University experts have now attempted to overcome the hurdles seen previously by using a different statistical approach. Their findings are published in the log Clinical Nutrition.
They compared the genes of over 360,000 people in the UK and Finland, and linked it to the risk of developing 22 types of cancer for 11 years.
They did this to account for the same factors that may have skewed previous research.
For example, self-confessed coffee drinkers also tend to drink more alcohol, which may explain their heightened risk of cancer.
But the genes that are associated with liking coffee are not necessarily linked to lifestyle factors like smoking or drinking.
Dr Steve Burgess and the team say, therefore, that looking at the DNA of volunteers makes it easier to determine whether it is coffee specifically that is causing cancer.
Data revealed that people deemed genetically more likely to drink coffee were nearly three times more likely to develop esophageal cancer.
No such link was found for any other cancer type.
‘The good news is that coffee drinking doesn’t increase your chance of getting most cancer types,’ said Dr Burgess.
Having coffee-loving genes increased the risk in actual coffee fans, as well as people who favored other hot beverages.
This suggests the effects may be due to the tissue damage caused by hot liquids, rather than the coffee itself.
‘The most likely reason for the association between coffee drinking and esophageal cancer is that pouring colding hot liquid down your throat is doing some damage,’ said Dr Burgess.
This idea is supported by a previous study carried out in 2019 which found drinking tea at over 60C increased the risk of esophageal cancer.
Scientists think when cells in the food pipe are burned by hot drinks, this generates inflammation that damages genes, causing cancer.
Further evidence is needed to confirm the findings.
Although, the WHO five years ago concluded is safe if consumed at ‘normal serving temperatures’ — ie 65C or under.
‘It’s important to consider that our study does not prove a causal link between coffee-drinking and esophageal cancer risk, it just provides strong evidence to suggest there is one,’ added Dr Burgess.
Around 9,300 people are diagnosed with oesophageal cancer each year in the UK, meaning it accounts for 2 per cent of new cancer cases.