• Insulin biology and clinical management emerge as the central research thread, tracing insulin isolation, localization of action, signaling, delivery, and therapeutic use across foundational and therapeutic works [9], [11], [14], [18], [20].

• Vascular and cardiovascular complications anchor diabetes research, uniting studies on arteriosclerosis and hypertension with retinal vascular changes and coronary disease to map diabetes-related vascular pathology [5], [6], [15], [19].

• Metabolic disturbances and endocrine regulation frame the disease concept, integrating diabetic acidosis, blood glucose dynamics, and endocrine regulation disruptions to model disease pathways [3], [4], [10], [12].

• Pancreatic function, regeneration, and glycemic regulation underpin the biology of diabetes, connecting pancreatic pathology, regeneration, and hyperglycemic–glycogenolytic factors with insulin action and signaling [9], [10], [13], [17].