One thing not mentioned yet; insulin flushes glucose out of your blood stream and into your tissues.
Once the limited storage in your muscles and organs is full, the rest goes into fat cells.
This is the same as the automatic process managed by a healthy pancreas.
If you get it right your body should behave close to that of someone with a healthy pancreas.
However there are some very unhealthy people with a healthy pancreas.
If you eat ridiculous amounts of sugars and carbohydrates, for example, you can possibly keep your BG stable but you are going to put on a lot of weight.
Another thing - if you start using a lot of insulin I think you can build up insulin resistance which sets up a vicious circle of more insulin then more resistance.
So, like T2s, you can eat anything but this doesn't mean you necessarily should.