A study by city health officials finds that the five-year ban on trans fat made a meaningful dent in people's consumption of the artery clogger. And it wasn't replaced with another bad fat.
Researchers analyzed thousands of lunch receipts collected at fast food chains before and after the ban went into effect.
The research estimates that the average trans fat content of customers' meals has dropped by 2.5 grams, from about 3 grams to 0.5 grams.
Details are in the journal Annals of Internal Medicine.