METS-IR shows U-shaped link to gallstone disease risk, with inflection at 29.83

This population-based cohort study investigated the unclear association between the Metabolic Score for Insulin Resistance (METS-IR) index and incident gallstone disease. The study included 52,723 participants without gallstone disease at baseline. Participants were stratified into five groups according to METS-IR quintiles. Multivariable Cox proportional hazards regression models were used to assess the association. Restricted cubic spline analysis examined the dose-response relationship, and threshold effect analysis identified potential inflection points. Subgroup and sensitivity analyses were performed to evaluate robustness.

Over a mean follow-up of 3.13 years, 1,407 incident cases of gallstone disease occurred. Compared to the Q2 group, the risk of gallstone disease was significantly higher in Q3 (hazard ratio (HR)=1.29, 95% confidence interval (CI): 1.08–1.54), Q4 (HR = 1.50, 95% CI: 1.25–1.80), and Q5 (HR = 1.85, 95% CI: 1.53–2.25), but not in Q1 (HR = 1.12, 95% CI: 0.93–1.35). A nonlinear U-shaped association was identified, with an inflection point at a METS-IR of 29.83. Below this point, each unit increase in METS-IR was associated with a 2.7% lower risk (HR = 0.973, 95% CI: 0.956–0.991). Above this point, each unit increase was associated with a 4.1% higher risk (HR = 1.041, 95% CI: 1.031–1.051). Subgroup and sensitivity analyses confirmed the robustness of these findings.

The study concludes that the METS-IR exhibits a nonlinear U-shaped association with the risk of incident gallstone disease, and that both lower and higher METS-IR levels, relative to the identified inflection point, are associated with an elevated risk.

If you're worried about gallstones, a new study suggests paying attention to your metabolic health might be more important than you think. Researchers followed over 52,000 people without gallstones for an average of about three years. They tracked a score called METS-IR, which measures your body's resistance to insulin—a key hormone for managing blood sugar and metabolism. They found a surprising 'U-shaped' relationship between this score and gallstone risk. The risk was lowest when the METS-IR score was around 29.83. For people with scores below that point, each unit increase in the score was actually linked to a slightly lower risk of gallstones. But for people with scores above that point, each unit increase was linked to a higher risk. In fact, people in the highest-scoring group had nearly double the risk compared to those in the second-lowest group. The study found this pattern held true across different groups of people, making the finding robust. This means that for gallstone prevention, having a metabolic score that's too low or too high might both be problematic, pointing to a specific 'sweet spot' for metabolic health.