Recommended viewing: Dr. Chris Knobbe - Diseases of Civilization: Are Seed Oil Excesses the Unifying Mechanism?
https://www.youtube.com/watch?v=7kGnfXXIKZM
Here's a slide where he shows that soybean oil induces diabetes (in mice):
https://youtu.be/7kGnfXXIKZM?t=2341
The talk makes the case on how it's also applicable to humans.