Can coffee cause cancer?

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25th December 2022

Can coffee cause cancer?

Coffee is a hugely popular drink, but many people are concerned that it may cause cancer. Others claim that drinking coffee offers health benefits and may even prevent cancer. So, what does the evidence say?

In this article, we examine the possible link between coffee and cancerand look at whether drinking coffee can provide any health benefits.

There is no research proving that coffee is a carcinogen.

Cancer is a complex disease, and it is not always easy to determine its cause. Researchers have investigated many different substances to find out if they increase a person's risk of cancer. Substances that can cause cancer are known as carcinogens.

The International Agency for Research on Cancer (IARC) reviewed more than 1,000 studies in humans and animals and did not find adequate evidence to indicate that coffee is a carcinogen.

However, more research into the link between coffee and cancer is necessary. A 2017 study suggests that drinking coffee may, in fact, lower the risk of developing specific forms of cancer.

Although older studies did sometimes find a link between drinking coffee and developing cancer, the cause was often smoking rather than coffee. People who smoke also tend to drink coffee.

Why do people think it might cause cancer?

Roasted coffee beans contain a substance called acrylamide, which is a byproduct of the roasting process.

The IARC classify acrylamide as a Group 2A probable carcinogen. This means that there is substantial evidence suggesting that acrylamide can cause cancer in animals. However, more research is necessary to determine if it also increases the risk of cancer in people.

Coffee does not contain acrylamide unless it has come from roasted coffee beans. People who are concerned about acrylamide can choose an alternative type of coffee.

Acrylamide also occurs in:

  • cigarette smoke
  • industrial processes, such as making plastic, paper, and dyes
  • starchy foods that need cooking at a high temperature, for example, fries and potato chips
  • food packaging and some adhesives, in small quantities

People can limit their exposure to acrylamide by being aware of cooking methods and not smoking. They can roast or bake potatoes instead of frying them and toast bread until it is light rather than dark brown.

There is also a link between drinking very hot liquids and cancer of the esophagus, or food pipe. Drinking coffee that is hotter than 149ºF may increase a person's risk of developing esophageal cancer. Therefore, it is best to allow coffee to cool slightly before drinking it, particularly if it does not contain milk.

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