Plain language summary
There is increasing research aimed at reducing the prevalence of overweight and obesity worldwide. Evidence suggests nutrient-dense, whole food choices may help reduce weight gain by increased fibre intake, reduced fat absorption and improved satiety levels, and avocados have recently been suggested to help reduce excess adiposity. The aim of this study is to examine the effect of habitual avocado intake on adult weight gain and changes in body mass index (BMI). This longitudinal study analysed data from the Adventist Health Study-2, which is comprised of approximately 96,000 members. Subjects were mailed a comprehensive lifestyle questionnaire that included self-reported weight, height and avocado consumption. Two follow-up questionnaires were sent out to collect self-reported weight, with follow-up time varying between 4-11 years. This study found avocado intake to be associated with a lower prevalence of overweight and attenuated weight gain in normal weight individuals over time. While avocado intake reduced the odds of becoming overweight or obese, when adjusted for BMI it was found baseline BMI had more of an impact on the odds of becoming overweight or obese than avocado intake. Based on these results, the authors suggest avocado consumption, as part of a healthy diet, may impact long-term changes in weight at the population level.