Coffee could be served soon on cups with a cancer warning in California. The Council for Education and Research on Toxics launched a suit in California on 1991 against more than 40 companies within the coffee business industry, accusing them of failing to warn consumers about carcinogens in their coffee. The lawsuit, which has been grinding on for years, alleges no matter how the coffee is brewed, it always comes with a potential carcinogen: acrylamide.
The international agency for research of cancer (IARC) started on 1968 a programme on the evaluation of the carcinogenic risk of chemicals to humans. Years later, 1980, the agenda change to elaborate series of research finding, monographs, of the data on carcinogenicity for chemicals and complex mixtures, and the probability that exposure to those elements will lead to cancer in humans. The evaluations of the data/result on those papers must be written in terms of human risk, and the indication where additional research efforts are needed.
In 1991, the IARC published its Volume 51 on Coffee, tea and Mate. The evaluation final on this document was the founded a limited evidence in humans that coffee drinking is carcinogenic in the urinary bladder. Consequently, coffee was possibly carcinogenic to the human urinate bladder (Group 2E).
In Jun 2016 the IARC changed the Coffee classification from group 2 to group 3 after new study and a meticulous reviewing of more than 1,000 studies in humans and animals, had founded inadequate/no conclusive evidence linking coffee to any cancer-causing effects- or carcinogenicity. This means that drink coffee and cancer does not have any evidence of correlation.
However, those studies results suggested that drinking very hot beverages could probably cause of esophageal cancer, and that it is the temperature rather than the drinks themselves that could potentially cause cancer.
The Specialty Coffee Association of America (SCAA) recommend for brewing coffee water a temperature to fall between 200°F ± 5°. Coffee is best served at a temperature between 130ºF and 180ºF. Most coffee drinkers appreciate the flavour and the aftertaste of the coffee when it is between 120°F and 140°F.
Also remember, there is a cold brewer and iced coffee as an alternative for all us how enjoy a cold coffee drink.