Nutrition, Vitamin, Supplement News for Senior Citizens

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Seniors rejoice at study declaring coffee does not cause cancer

Coffee has been well established as the favorite drink for senior citizens

A woman enjoys her morning coffeeJune 16, 2016 – Yesterday was a great day for most senior citizens. They welcomed the news that their favorite drink – coffee – does not cause cancer, and, in fact, in many cases may prevent it.

An international Working Group of 23 scientists convened by the International Agency for Research on Cancer (IARC), the cancer agency of the World Health Organization (WHO), found no conclusive evidence for a carcinogenic effect of drinking coffee.

Drinking coffee was not classifiable as to its carcinogenicity to humans, which places it in Group 3. The large body of evidence currently available led to the re-evaluation of the carcinogenicity of coffee drinking, previously classified as possibly carcinogenic to humans (Group 2B) by IARC in 1991. 

After thoroughly reviewing more than 1000 studies in humans and animals, the Working Group found that there was inadequate evidence for the carcinogenicity of coffee drinking overall.

Many epidemiological studies showed that coffee drinking had no carcinogenic effects for cancers of the pancreas, female breast, and prostate, and reduced risks were seen for cancers of the liver and uterine endometrium. For more than 20 other cancers, the evidence was inconclusive.  

The experts did find, however, that drinking very hot – above 149°F (65°C) - beverages probably causes cancer of the esophagus in humans. Water boils at 212°F (100 °C).

“These results suggest that drinking very hot beverages is one probable cause of esophageal cancer and that it is the temperature, rather than the drinks themselves, that appears to be responsible,” says Dr Christopher Wild, IARC Director. Drinking very hot beverages was classified as probably carcinogenic to humans (Group 2A). 

This was based on limited evidence from epidemiological studies that showed positive associations between cancer of the esophagus and drinking very hot beverages. Studies in places such as China, the Islamic Republic of Iran, Turkey, and South America, where tea or maté is traditionally drunk very hot (at about 70 °C), found that the risk of esophageal cancer increased with the temperature at which the beverage was drunk. 

No conclusive evidence was found for drinking maté, a traditional South American caffeine  infused drink, at temperatures that are not very hot. 

And, in experiments involving animals, there was also limited evidence for the carcinogenicity of very hot water.

“Smoking and alcohol drinking are major causes of esophageal cancer, particularly in many high-income countries,” stresses Dr Wild.

“However, the majority of esophageal cancers occur in parts of Asia, South America, and East Africa, where regularly drinking very hot beverages is common and where the reasons for the high incidence of this cancer are not as well understood.” 

Esophageal cancer is the eighth most common cause of cancer worldwide and one of the main causes of cancer death, with approximately 400 000 deaths recorded in 2012 (5% of all cancer deaths). The proportion of esophageal cancer cases that may be linked to drinking very hot beverages is not known.  Maté 

Cold maté did not have carcinogenic effects in experiments on animals or in epidemiological studies.  Therefore, drinking maté at temperatures that are not very hot was not classifiable as to its carcinogenicity to humans. 

This was based on inadequate evidence in humans for the carcinogenicity of drinking cold or warm maté and inadequate evidence in experimental animals for the carcinogenicity of cold maté as a drinking liquid.

Maté is an infusion made from dried leaves of Ilex paraguariensis. It is consumed mainly in South America and to a lesser extent in the Middle East, Europe, and North America. Maté is traditionally drunk very hot (at about 70 °C), but it may also be consumed warm or cold.

The IARC Monographs Programme seeks to classify cancer hazards, meaning the potential of any substance to cause cancer based on current knowledge. The classification does not indicate what level of risk exists to people’s health associated with exposure to a classified hazard. For example, IARC has classified tobacco smoking as carcinogenic to humans (Group 1), but that classification does not indicate the increase in risk for each cigarette smoked. 

This Working Group evaluation is in line with the WHO Technical Report Series 916 on Diet, Nutrition and the Prevention of Chronic Diseases, which states that people should not consume drinks when they are at a very hot (scalding hot) temperature.

A summary of the final evaluations was published yesterday in The Lancet Oncology, and the detailed assessments will be published as Volume 116 of the IARC Monographs.

For more information on the IARC classification, read the IARC Monographs Q&A: 

>  Read the IARC Monographs Q&A on the evaluation of drinking coffee, maté, and very hot beverages

>   For more information

The International Agency for Research on Cancer (IARC) is part of the World Health Organization. Its mission is to coordinate and conduct research on the causes of human cancer and the mechanisms of carcinogenesis, and to develop scientific strategies for cancer control. The Agency is involved in both epidemiological and laboratory research and disseminates scientific information through publications, meetings, courses, and fellowships.


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