Poor adherence to national dietary guidelines as part of an unhealthy lifestyle among young adults contributes to increased rates of overweight and obesity (1). This transitional life stage, coupled with the complexity of obesity, can increase susceptibility to energy imbalances through dietary choices (2). This study examined eating contextual factors associated with young adults' discretionary food consumption at eating occasions (EO) which include meals and snacks. This secondary analysis utilised cross-sectional data from the Measuring Eating in Everyday Life Study (MEALS). Participants (18-30y, n = 675) reported their dietary intakes in near-real time over 3-4 non-consecutive days via a Smartphone food diary application. For every EO, contextual factors were recorded, categorised as social (activity and presence of others), environmental (location of consumption and purchase), or relating to preparation (homemade/not). Discretionary food intakes, defined as foods high in saturated fats, added salt and sugar (1 serving = 600kJ) were calculated for each EO. Associations between discretionary food intake (in servings) and contextual factors were analysed using mixed effect models, adjusted for sociodemographic covariates. Consumption locations were significant predictors at meals (p < 0.001) but not snacks. Eating while transiting and outside of home were associated with higher discretionary food consumption at meals, with a mean difference of 0.6 (95% CI: 0.21, 0.99) and 0.34 (0.19, 0.49) servings, respectively, compared to eating at home. Conversely, purchasing at a supermarket, compared to a convenience store, was associated with lower discretionary food intake (-0.8 (-1.06, -0.53) servings). Similarly, purchasing at a supermarket was also associated with lower intake of discretionary foods at snacks (0.83 (-1.15, -0.52) servings), compared to a convenience store. In conclusion, the location of consumption and purchase may influence discretionary intake at EO, and emphasises the importance of considering contextual factors when designing healthy eating strategies and interventions.