High fat diets can cause insulin resistance. So can high protein diets. Overall blood sugar regulation remains similar across most macronutrient ratios as long as calories are controlled, as cells scale their receptivity to insulin to maintain homeostasis. The number one controllable factor is calorie intake (minus calorie expenditure), not macronutrient breakdown, and there isn't any one priveledged breakdown that universally works for everyone to control calorie intake.