From the International Journal of Occupational and Environmental Health comes this article looking at Changes in kidney function among Nicaraguan sugarcane workers. The article is behind a paywall but according to the NPR article it exonerates the fertilizers and pesticides and adds to the data on chronic and recurrent dehydration as the culprit:
I found this bit interesting:
If the energy drink is protective that seems to counter the fructose/uric acid hypothesis that Dr. Johnson was proposing in his article. This continues to be one of the most interesting stories in nephrology.