A mathematical study looked at the prevalence of Type 2 diabetes in 50 countries. The global prevalence of type 2 diabetes has increased six-fold over the past few decades, so the study’s conclusion that countries where consumption of black tea is high lowers the number of type 2 diabetics is particularly relevant now. Coming in first for black tea consumption was Ireland, closely followed by the United Kingdom and Turkey. (Morocco and Mexico had the lowest consumption rates of black tea.) While the study showed an impact on the rates of diabetes, it did not find any other health impacts. While the authors of the study acknowledge that there may be exceptions to their findings, their research does agree with many previous studies.