This article examines determinants of changes in food insufficiency status over time in a Michigan welfare sample. The studied determinants include individual constraints on coping abilities, work‐related demands, and resources of households. Analyses use logistic regressions based on data from four waves of the Women’s Employment Study. Findings suggest that, without controlling for unobserved heterogeneity, hours worked, transportation expenses, and measures of coping ability are associated with food insufficiency. However, conditional fixed‐effect logistic regression models suggest that having one or more mental health problems and a low level of financial resources are associated with reported food insufficiency.