Child care subsidies make you fat

A study from the National Bureau of Economic Research on child care subsidies and childhood obesity  found an association between receiving a subsidy and a greater likelihood of being overweight and obese.

Just wondering:

Did the study look at what the children ate when they were away from child care centres?

Did the study look at children in the same centres who didn’t receive subsidies?

Did the study look at children in centres where none received subsidies?

Hat Tip: Anti-Dismal