Insulin resistance may or may not be reversible. It appears to be a case by case basis. Being primal and intermittent fasting has increased my insulin sensitivity. While reversing all indications of metabolic syndrome has been incredibly good news for me, controlling the symptoms is even more important for those with more difficult or stubborn conditions.
Insulin resistance is the key health marker for diabetes. Anyone diagnosed with it should read Dr. Bernstein.
Here's research that should help.
LCD = Low Carb Diet
Another one:The weight gain in animals fed LCD may be related to their greater caloric intake, lower levels of glucagon-like peptide-1, and higher protein consumption. The adoption of LCD promotes a unique metabolic state that prevents insulin resistance, even in guinea pigs that gained more weight. The association between weight gain and insulin resistance seems to be dependent on high carbohydrate intake.
There's even more encouraging results with intermittent fasting. I've combined both and had better results than I could have hoped for.... a low-carbohydrate diet followed for 2 weeks resulted in spontaneous reduction in energy intake to a level appropriate to their height; weight loss that was completely accounted for by reduced caloric intake; much improved 24-hour blood glucose profiles, insulin sensitivity...