Temperature, Humidity and Climate

Ok this is a random, but have tests ever been done on the pancreas that are temperature driven?   

Humidity and climate?  Since the Diabetes belt is so warm and humid. Conversly, the Arctic people, who have a high rate of diabetes, have a lot of cold temperatures, so maybe the inflammation of the gut is a coping mechanism.

They both have diets high in fish, because of their proximity to the coast.

There's a lot of heat in the summer and longer warm periods for the Diabetes Belt, so higher metabolisms.  More open pores and sweating, gradually favoring larger bodies.  This doesn't correlate however with the Arctic people's because they have closed pores and smaller bodies.