The claim that low insulin levels can occur alongside normal blood sugar levels is a basic physiological and clinical reality, particularly in contexts like basal states, certain endocrinopathies, or specific therapeutic interventions (such as hyperinsulinemic-euglycemic clamps where glucose is artificially infused to match normal levels while insulin is manipulated, or conversely endogenous insulin deficiency states before overt hyperglycemia develops). As a standard medical fact, it falls under common knowledge.