According to the NZZ, however, nutrition experts are reacting calmly to the news. There is a simple reason for this. The assessment as "possibly carcinogenic" alone says little. What is decisive is the amount that a person consumes. The World Health Organisation (WHO) is not worried either. In the context of normal consumption, aspartame is harmless. Anyone who chews artificially sweetened chewing gum or drinks an artificially sweetened soft drink from time to time has nothing to worry about.

Quantity makes the poison

The basis for the headlines was the reclassification of aspartame as "possibly carcinogenic" by the International Agency for Research on Cancer (IARC). The IARC classification is discussed in the swiss-food glossary article on the keyword "carcinogenic". The different classifications on the subject of carcinogenicity are also the subject of a newsletter. The NZZ writes: "Important to know: The IARC only assesses whether a substance could in principle cause cancer. It does not take into account how much of it a person would have to ingest to have a risk of disease, explained Mary Schubauer-Berigan. She heads the IARC Monographs programme responsible for classification."

The importance of limit values

This is the crucial point, which of course applies not only to aspartame, but also to other substances such as pesticides, which the International Agency for Research on Cancer evaluates. The label "possibly carcinogenic" alone says nothing. The inherent toxicity, i.e. the danger alone, says nothing. What is decisive is how much a person ingests, for example, how much substance a person takes in under real conditions. That is the risk: the inherent danger times the exposure. That is why there are limit values. For aspartame, the recommended maximum is 40 milligrams per kilogram of body weight. According to the NZZ, that is nine to 14 doses of a drink containing high levels of aspartame per day for a person weighing 70 kilograms. With these amounts, one can no longer speak of moderate consumption.