Gary Taubes talks about this in his books. Adipose tissue isn't a just a layer of fat that extra calories get stored into like leftovers in the fridge until out bodies get hungry enough we break down and pop a Tupperware of meatloaf in the microwave. It's constantly in a state of accepting and releasing energy. The problem is when insulin is too high our adipose tissue is storing more calories then it lets out. If you eat a 600 calorie meal and half the calories get put into fat storage your body only has 300 calories to run on, once that gets depleted you body tells you to eat more because with the high insulin the calories in fat are still locked away. So you eat more, and if you insulin is still too high the process gets repeated.
With low insulin levels your adipose tissue works like it was designed to with energy going in and out constantly. If you don't eat for a couple hours or a day your adipose tissue is still releasing energy. This is why a lot of people find its easy to skip meals or to fast without feeling weak or ravishingly hungry at times when they would have been ready to eat anything in sight pre primal.