We estimate the impacts of Wal-Mart and warehouse club retailers on height-adjusted body weight and overweight and obesity status, finding robust evidence that non-grocery selling Wal-Marts reduce weight while grocery-selling Wal-Marts and warehouse clubs either reduce weight or have no effect. The effects appear strongest for women, minorities, urban residents, and the poor. We then examine the effects of these retailers on exercise, food and alcohol consumption, smoking, and eating out at restaurants in order to explain the results for weight. Most notably, the evidence suggests that all three types of stores increase consumption of fruits and vegetables while reducing consumption of foods high in fat. This is consistent with the thesis that Wal-Mart increases real incomes through its policy of "Every Day Low Prices," making healthy food more affordable, as opposed to the thesis that cheap food prices make us eat more.
Of course, not everyone likes Wal-Mart.