"Einem häufigen Genuss von Mate-Tee wird jedoch auch ein karzinogenes Risiko zugeschrieben. Insbesondere die Entwicklung von Blasenkrebs,[6] Speiseröhrenkrebs[7][8] sowie Lungenkrebs[9] durch hohe Anteile von PAK (Polyzyklische aromatische Kohlenwasserstoffe) und Benzo(a)pyrene[10][11] werden mit dem Konsum von Mate-Tee verbunden. Man geht davon aus, dass eine hohe Konzentration der PAK durch die Rauchtrocknung des Yerba Mate entsteht. Es existiert allerdings auch Yerba Mate, welcher nicht über Feuer getrocknet wird. Bei den Untersuchungen zum Speiseröhrenkrebs wird darauf hingewiesen, dass eine höhere Temperatur des Getränks die Krebshäufigkeit erhöhte."
"A review of a number of population studies in 2009 revealed evidence of an association between esophageal cancer and hot mate drinking, but these population studies may not be conclusive.[29] Some research has suggested the correlation with esophageal cancer results almost entirely from damage caused to the esophagus by burns from the hot liquid as opposed to damage caused by chemicals in the mate; similar links to cancer have been found for tea and other beverages generally consumed at high temperatures. While drinking mate at very high temperatures is considered as "probably carcinogenic to humans" on the IARC Group 2A carcinogens list, mate itself is not classifiable as to its carcinogenicity to humans.[30]
Researchers from NCI (National Cancer Institutes) and Brazil found both cold- and hot-water extractions of popular commercial yerba-mate products contained high levels (8.03 to 53.3 ng/g dry leaves) of carcinogenic polycyclic aromatic hydrocarbons (PAHs) (i.e. benzo[a]pyrene).[31] However, these potential carcinogenic compounds originated from the commercial drying process of the mate leaves, which involves smoke from the burning of wood, much like polycyclic aromatic hydrocarbons found in wood-smoked meat.[32] "Unsmoked" or steamed varieties of yerba-mate tea are also available.[33]"
9 Comments:
Researchers from NCI (National Cancer Institutes) and Brazil found both cold- and hot-water extractions of popular commercial yerba-mate products contained high levels (8.03 to 53.3 ng/g dry leaves) of carcinogenic polycyclic aromatic hydrocarbons (PAHs) (i.e. benzo[a]pyrene).[31] However, these potential carcinogenic compounds originated from the commercial drying process of the mate leaves, which involves smoke from the burning of wood, much like polycyclic aromatic hydrocarbons found in wood-smoked meat.[32] "Unsmoked" or steamed varieties of yerba-mate tea are also available.[33]"