Higher Dietary Inflammation Linked to Greater Hidden TB Risk

Latent Tuberculosis Infection (LTBI) affects many people quietly, and researchers are increasingly interested in what makes some individuals more likely to harbor this hidden infection. One line of enquiry looks at inflammation driven by diet. The Dietary Inflammatory Index (DII) is a tool that scores diets from anti-inflammatory to pro-inflammatory, and Wanjie Yang and colleagues set out to test whether people with more pro-inflammatory diets were more likely to have LTBI. To do this they used data from the National Health and Nutrition Examination Survey (NHANES), a large, nationally representative U.S. health study. From NHANES the team selected 3,892 participants and collected standard demographic and health information, including age, sex, race, body mass index (BMI), education level, poverty income ratio (PIR), marital status, smoking, alcohol consumption, hypertension (HPT), and diabetes mellitus (DM). The study used a cross-sectional design to look for associations at a single point in time. Using statistical approaches that included univariate and multivariate logistic regression, the researchers aimed to account for other factors that might influence the relationship between diet-related inflammation and LTBI.

The analysis combined standard epidemiological tools and graphical methods to examine the DII–LTBI relationship. The study population had a mean age of 48.4 ± 17.8 years and was 50.6% male. The investigators ran logistic regression models, adjusting for confounding variables listed in the dataset, and they also used smooth curve fitting to check the shape of any association. After accounting for age, sex, race, BMI, education level, PIR, marital status, smoking, alcohol consumption, HPT, and DM, the team found a positive association between DII and the risk of LTBI: the odds ratio was 1.07 with a 95% confidence interval of 1.01–1.13 and a P value of 0.023. The adjusted smoothed plots suggested a straightforward linear relationship (P for non-linearity = 0.924), meaning that as DII increased, LTBI risk rose. Subgroup analyses across gender, age, BMI, PIR, smoking, drinking, HPT, and DM showed no significant interactions—every P value for interaction exceeded 0.05—so the association appeared consistent across these groups.

Taken together, these findings indicate that diet-related inflammation, as measured by the Dietary Inflammatory Index, may be an important risk factor for Latent Tuberculosis Infection. If confirmed, this link offers a new perspective for early screening and preventive strategies: clinicians and public health programs might consider whether dietary patterns that increase inflammation could help identify people at elevated risk for LTBI. The study does not establish cause and effect because it is cross-sectional; it shows association, not proof that pro-inflammatory diets cause LTBI. The authors emphasize that further research is needed to uncover the biological or behavioral mechanisms that could explain the connection. Still, the results point to a potentially modifiable factor—dietary inflammation—that could complement existing approaches to TB control and prevention if later studies support a causal role.