One of the major limitations in studying alcohol's effect on risk for diabetes is the issue of classifying drinking patterns across the life course prior to the onset of diabetes. Furthermore, this research often overlooks important life course risk factors such as obesity and early-life health problems that may complicate estimation of the relationship between alcohol and diabetes. This study used data from the US National Longitudinal Survey of Youth 1979 cohort of 14-21 year olds followed through 2012 (n = 8289). Alcohol use was captured through time-varying measures of past month volume and frequency of days with 6+ drinks. Discrete-time survival models controlling for demographics, early-life characteristics and time-varying risk factors of employment, smoking, and body mass index (BMI) group, stratified by sex and race/ethnicity, were estimated. Increased odds of diabetes onset was found among lifetime abstainers for women compared to the low volume reference group (odds ratio (OR) 1.57; 95% Confidence Interval (CI) 1.07-2.3). Increased odds of diabetes onset was also found among women who reported drinking 6+ drinks in a day on a weekly basis during the prior 10 years (OR 1.55; CI 1.04-2.31). Models interacting alcohol and BMI groups found increased odds of diabetes onset from lifetime abstention among overweight women only (OR 3.06; CI 1.67-5.60). This study confirms previous findings of protective effects from low volume drinking compared to lifetime abstention and harmful effects from regular heavy occasion drinking for women. Further, protective effects in this US sample were found to be limited to overweight women only.
Keywords: Alcohol; Body mass index; Diabetes; Lifetime abstainer; Longitudinal.
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