When you order a coffee, do you ask for it to be \u201cextra hot\u201d?<\/p>\n
Whether you enjoy tea, coffee or something else, hot drinks are a comforting and often highly personal ritual. The exact temperature to brew tea or serve coffee for the best flavour is hotly debated<\/a>.<\/p>\n But there may be something else you\u2019re not considering: your health.<\/p>\n Yes, hot drinks can be too hot \u2013 and are even linked to cancer. So, let\u2019s take a look at the evidence.<\/p>\n What\u2019s the link between hot drinks and cancer?<\/p>\n There is no evidence for a link between hot drinks and throat<\/a> cancer and the evidence for a link between hot drinks and stomach cancer<\/a> is unclear<\/a>. But there is a link between hot drinks and cancers of the \u201cfood pipe\u201d or oesophagus<\/a>.<\/p>\n In 2016, the International Agency for Research on Cancer classified<\/a> drinking very hot beverages, meaning above 65\u00b0C, as \u201cprobably carcinogenic to humans\u201d \u2013 this is the same risk<\/a> category as emissions from indoor wood smoke or eating a lot of red meat.<\/p>\n The agency\u2019s report found it was the temperature, not the drinks, that were responsible.<\/p>\n This is based mainly on evidence from South America<\/a>, where studies found a link between drinking a lot of mat\u00e9 \u2013 a traditional herbal drink usually drunk at around<\/a> 70\u00b0C \u2013 and a higher risk of oesophageal cancer.<\/p>\n Similar studies in the Middle East<\/a>, Africa<\/a> and Asia<\/a> have also supported the link between drinking very hot beverages and developing oesophageal cancer.<\/p>\n However, until recently we didn\u2019t have substantial research exploring this link in Europe and other Western populations.<\/p>\n This year, a large study<\/a> of almost half a million adults in the United Kingdom confirmed drinking higher amounts of very hot drinks (tea and coffee) was associated with oesophageal cancer.<\/p>\n The study found that someone who drank eight or more cups a day of very hot tea or coffee was almost six times more likely to develop oesophageal cancer, compared to someone who didn\u2019t drink hot drinks.<\/p>\n How do hot drinks cause cancer?<\/p>\n Drinking a lot of very hot drinks can damage cells in the oesophagus lining, and it\u2019s believed over time this can lead to cancer developing. Researchers first proposed<\/a> this link almost 90 years ago.<\/p>\n What we know about how hot drinks can damage the oesophagus mainly comes from animal studies.<\/p>\n Very hot water may accelerate cancer growth. One animal study<\/a> from 2016 studied mice that were prone to developing cancer. Mice given very hot water (70\u00b0C) were more likely to develop precancerous growths in the oesophagus, and sooner, compared to mice given water at lower temperatures.<\/p>\n Another theory<\/a> is that heat damage to the oesophagus lining weakens its normal barrier, increasing the risk of further damage from gastric acid reflux (from the stomach). Over time, this chronic damage can increase the chance of oesophageal cancer developing.<\/p>\n Does how much you drink matter?<\/p>\n The risk of cancer may depend on how much hot liquid you drink in one sitting and how quickly. It seems drinking a lot in one go is more likely to damage the oesophagus by causing a heat injury.<\/p>\n In one study<\/a>, researchers measured the temperature inside the oesophagus of people drinking hot coffee at different temperatures.<\/p>\n They found the size of the sip the person took had more impact than how hot the drink was. A very big sip (20 millilitres) of 65\u00b0C coffee increased the temperature inside the oesophagus by up to 12\u00b0C. Over time, large sips can lead to sustained heat injury that can damage cells.<\/p>\n The occasional small sip of coffee at 65\u00b0C isn\u2019t likely to result in any long-term problems. But over years, drinking large amounts of very hot drinks could very well increase the risk of oesophageal cancer.<\/p>\n So, what\u2019s a safe temperature?<\/p>\n The brewing temperatures<\/a> for drinks such as coffee are very high \u2013 often close to the boiling point of water.<\/p>\n For example, takeaway hot drinks may be sometimes<\/a> be served at very high temperatures (around 90\u00b0C) to allow for cooling when people drink them later at the office or home.<\/p>\n One study from the United States<\/a> calculated the ideal temperature for coffee, factoring in the risk of heat injury to the oesophagus while preserving flavour and taste. The researchers came up with an optimum temperature of 57.8\u00b0C.<\/p>\n Tips to consume hot drinks safely<\/p>\n Slow down, take your time and enjoy.<\/p>\n Allowing time for a very hot drink to cool is important and research has shown<\/a> a hot drink\u2019s temperature can drop by 10\u201315\u00b0C in five minutes.<\/p>\n Other things that may help cool a hot drink:<\/p>\n Finally, small sips are a good idea to test the temperature, given we know having a large amount has a significant impact on the temperature inside the oesophagus<\/a> and potential damage to its lining.<\/p>\n This article is republished from The Conversation<\/a>. It was written by: Vincent Ho<\/a>, Western Sydney University<\/a> <\/p>\n Read more:<\/p>\n Vincent Ho does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.<\/p>\n","protected":false},"excerpt":{"rendered":"When you order a coffee, do you ask for it to be \u201cextra hot\u201d? 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