Low-Grade Inflammation as a Unifying Mechanism in Chronic Internal Medicine: Diabetes at the Center of Cardiometabolic Disease

Abstract

Low-grade inflammation has emerged as a central biological mechanism linking multiple chronic conditions commonly encountered in internal medicine. Increasing evidence indicates that metabolic and cardiovascular diseases are not isolated entities, but interconnected manifestations of a shared immunometabolic dysfunction. In this context, type 2 diabetes mellitus occupies a pivotal role, functioning both as a consequence and a driver of chronic inflammatory activation. This narrative review synthesizes experimental, epidemiological, and clinical evidence to analyze low-grade inflammation as a cross-cutting mechanism underlying chronic disease, with particular emphasis on its relationship with insulin resistance, metabolic dysregulation, and cardiovascular risk. The findings demonstrate a progressive increase in inflammatory burden across the metabolic continuum, a close association between inflammation and insulin resistance, and a consistent convergence between inflammatory activity and cardiovascular risk. These patterns are preserved across different population contexts, supporting the global relevance of inflammation-centered models of chronic disease. Conceptualizing diabetes as an immunometabolic disorder within this framework offers an integrative perspective that may enhance clinical reasoning, prevention strategies, and medical education in internal medicine.