Body weight time in target range and cardiovascular outcomes in adults with overweight/obesity and type 2 diabetes

AIMS: Prescription of weight loss to individuals is often characterized by weight fluctuations. However, current body weight management metrics may have difficulty characterizing the changes in body weight over time. We aim to characterize the long-term changes using body weight time in target range (TTR) and test its independent association with cardiovascular outcomes. METHODS AND RESULTS: We included 4468 adults from the Look AHEAD (Action for Health in Diabetes) trial. Body weight TTR was defined as the percentage of time during which body weight was within the Look AHEAD weight loss goal range. The associations of body weight TTR with cardiovascular outcomes were analysed using multivariable Cox modelling and restricted cubic spline function. Among the participants (mean age 58.9 years, 58.5% women, 66.5% White), there were 721 incident primary outcomes [cumulative incidence: 17.5%, 95% confidence interval (CI): 16.3-18.8%] during a median of 9.5 years of follow-up. Each 1 SD increase in body weight TTR was significantly associated with a decreased risk of the primary outcome (hazard ratio: 0.84, 95% CI: 0.75-0.94) after adjusting for mean and variability of body weight and traditional cardiovascular risk factors. Further analyses using restricted cubic spline indicated the inverse association between body weight TTR and the primary outcome in a dose-dependent manner. Similar associations remained significant among the participants with lower baseline or mean body weight. CONCLUSION: In adults with overweight/obesity and type 2 diabetes, higher body weight TTR was independently associated with lower risks of cardiovascular adverse events in a dose-response manner.