SJS Comment. This is a huge increase in insulin sensitivity (the underlying problem of Type 2 Diabetes) in an extremely short period of time.
“Cold exposure may be a potential therapy for diabetes by increasing brown adipose tissue mass and activity. Here we report that 10 days of cold acclimation (14–15 °C) increased peripheral insulin sensitivity by ∼43% in type 2 diabetes subjects.”
https://www.nature.com/articles/nm.3891