I think eating paleo also helps with the insulin part. Probably also the brain chemical part because the better nutrition ought to make everything function better. But insulin isn't everything. I have insulin resistance and eat low carb all the time but I haven't lost any weight for a few months now. I probably need to move more and eat less to get any thinner. Perhaps hormones/thyroid is an issue, but in my opinion, the tests doctors do look for "normal" and "normal" is actually pretty dysfunctional, so the tests have never helped me.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.