Are you eating enough? Low insulin is a requirement for fat loss, but so is eating enough food to convince the body it’s safe to part with some of its reserves. That may sound paradoxical, in a world where “eat less, move more” is standard advice, but the body responds to inadequate energy intake (i.e., less than expenditure) by going into famine mode, slowing the metabolic rate and putting non-essential processes (nails, hair, the reproductive system) on hold. In times of caloric abundance, the metabolic rate goes up, and the body finds lots of things to spend its energy on.
So control your carbohydrate intake, be sure to get enough protein, and add enough fat to your diet to satisfy your hunger. The lowered carb intake will help lower your insulin, the protein will provide building materials (amino acids) for new muscle and stronger bone, and the fat will provide fuel for the body’s energy needs. So eat when hungry, stop eating when no longer hungry, and don’t eat again until hungry again.