Social Determinants of Health and Behavioral Risk Factors in the Tuberculosis-Type 2 Diabetes Syndemic: A Narrative Review.

The co-occurrence of tuberculosis (TB) and type 2 diabetes mellitus (T2DM) represents a growing global syndemic that disproportionately affects populations with limited access to healthcare and preventive resources. T2DM is an established independent risk factor for TB, while social determinants of health (SDoH) further contribute to disease susceptibility, delayed diagnosis, and poor clinical outcomes. This narrative literature review examines the impact of SDoH and modifiable lifestyle factors on the TB-T2DM syndemic and highlights opportunities for intervention. A literature review was conducted using PubMed and Google Scholar with keywords including "Type 2 Diabetes," "Tuberculosis," "Social Determinants of Health," "health literacy," "access to healthcare," "smoking," and "diet." Existing literature demonstrates that health literacy, socioeconomic status, nutrition, and healthcare accessibility are major contributors to the dual disease burden. Smoking has been associated with impaired beta-cell function, worsened glycemic control, and increased susceptibility to TB infection and recurrence. In contrast, Mediterranean dietary patterns, structured exercise, and lifestyle modification have been shown to improve glycemic control and reduce systemic inflammation. Populations from lower socioeconomic backgrounds remain particularly vulnerable because of compounding barriers, including malnutrition, overcrowding, and limited healthcare access. Addressing behavioral risk factors and SDoH through early detection, patient education, and public health interventions is essential to mitigating the TB-T2DM syndemic. An interdisciplinary approach integrating clinical care, preventive medicine, and global health policy is critical to improving long-term outcomes in affected populations.