If you look at the FII (Insulin Index), most foods which raise glucose BG also raise insulin but there are notable anomalies, for example, milk and rice (those aren't all of them).
To lose weight, it is necessary to lower insulin levels as insulin controls fat.
Before the discovery that injecting T1s with insulin kept them alive, they all died, unable to keep fat on, no matter how much they ate.
I quit drinking milk, because it tasted thin, in comparison to the fattier dairy products that I eat. The insulinogenic milk protein is in the liquid along with the lactose, not in the cream. When I quit drinking milk, the side benefit was, that I lost weight, as my insulin levels fell.
I work out how insulinogenic the non veg foods that I eat are. It's how I hit on eating creme fraiche last thing to stop my liver dumping at 6am. Low carb, low protein, high fat, easily digestible, great mouthfeel and 89p per pot.
Dr Andreas Eenfeldt always says that LCHF is low carb, high fat - and moderate protein. Not only can protein be converted into glucose by neoglucogenesis, insulin is needed to push the amino acids from proteins into cells.