To the Editor Among 22.6 million children aged 2 to 4 years enrolled in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) from 2000 to 2014, Pan et al1 observed modest declines in severe obesity.1 The Pan et al study1 offers an excellent case of social experiment if combined with a previous report using the same definition of severe obesity and with almost the same age range of children across the same study period, but among children from families of all income levels.