Ketogenic diets are known for helping improve insulin sensitivity, by eliminating the main cause of insulin resistance: very high insulin levels in the body. A diet which is high in carbs is basically feeding insulin resistance. More carbs means more need for insulin, which is actually worsening insulin resistance. A keto diet on the other hand, is decreasing insulin levels since fat requires less insulin than all other macronutrients. The diet helps decrease insulin levels and keep them low, since very few carbs mean lower insulin levels. When insulin levels are lower, it’s beneficial for fat loss, since high insulin levels stop the breakdown of fat. The body can break down fat cells if insulin levels are low for a number of hours.