Coffee is a hugely popular drink. However, 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?
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
The International Agency for Research on Cancer (IARC) reviewed more than 1,000 studies on 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 found that drinking coffee may, in fact, lower the risk of developing specific forms of cancer. A study published in 2020 showed
Roasted coffee beans contain a substance called acrylamide, which is a byproduct of the roasting process.
The IARC classifies acrylamide as a
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.
According to the Food and Drug Administration (FDA), acrylamide
- 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
The American Cancer Society (ACS) states that acrylamide is
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. Therefore, it is best to allow coffee to cool slightly before drinking it, particularly if it does not contain milk. A 2019 study recommended that optimum safe temperatures for drinking hot beverages are between
Most cancers occur due to a combination of factors, including people’s genes, environment, and lifestyle.
- having more weight
- having an unhealthy diet
- drinking alcohol
- certain existing health conditions, such as human papillomavirus (HPV)
- sun exposure
- workplace risks, such as exposure to certain chemicals and radiation
- specific inherited genes, although this is a relatively uncommon cause
These risk factors can combine to increase the likelihood of a person developing cancer. For example, someone may have an unhealthful diet and not do enough exercise.
Drinking coffee as part of a healthful lifestyle is unlikely to be a health risk. However, excessive coffee consumption can cause health problems. Coffee contains caffeine, a stimulant that makes the brain more alert and temporarily increases blood pressure.
Drinking coffee in the evening can disrupt sleep, and high quality sleep is essential for health. It might be beneficial to replace coffee with a decaffeinated version or a herbal tea later in the day.
Roasted coffee beans contain some acrylamide. Coffee drinkers can avoid this chemical by choosing unroasted coffee beans, although these do taste very different.
Doctors generally also suggest that
People trying to limit their coffee intake may wish to seek medical advice or cut out coffee and other caffeinated products completely.
However, if a person wants to reduce the amount of coffee that they drink, they should do so slowly. Cutting down on caffeine can cause headaches.
Replacing coffee with tea, decaffeinated coffee, water, or herbal teas can reduce a person’s caffeine intake. Black teas and some herbal teas, such as green tea, do contain caffeine. However, it usually amounts to less than that of a cup of coffee.
The study compared people who drank no coffee with people who drank the following amounts of coffee each day:
- approximately 4–7 cups
- about 1–3 cups
- one extra cup
The researchers found that all the groups drinking coffee had a lower rate of cancer than those who did not drink any coffee. People who drank more coffee had a reduced risk of developing the following cancers:
The study did not find a strong link between coffee consumption and the following cancers:
Other benefits of drinking coffee included a lower risk of death from all causes and a lower risk of heart disease, liver disease, and Parkinson’s disease. The researchers found that drinking 3–4 cups of coffee per day was most beneficial.
The British Medical Journal
Coffee also contains antioxidants. These are substances that may stop or slow down cell damage. However, more research on the potential health benefits of antioxidants is necessary.
Current research suggests that coffee is unlikely to cause cancer. It may reduce the risk of developing certain types of cancer. However, there is not yet enough scientific evidence to confirm this.
As part of a healthful diet, coffee is likely to be beneficial. Drinking up to 4 cups of coffee a day should not pose any risks to health and may reduce the risk of certain diseases.
However, a person who is pregnant or breastfeeding should consider speaking with a doctor about limiting their caffeine consumption.