Type-2 diabetes is a sham diagnosis. A key factor in the development of "insulin resistance" is the overconsumption of vegetable oils. These thin oils go rancid in the production process, and have to be "refined" to remove the rancid smell.

Before the middle of the 20th century, linseed oil and soybean oil were drying oils that were used to make stain and paint. When the paint producers figured out how to make paint from petroleum, the seed oil industry rebranded their product as "vegetable oil".