LOS ANGELES, CA - JULY 24:  Fast-food restaurants signs line a street July 24, 2008 in the South Los Angeles area of Los Angeles, California. The Los Angeles City Council committee has unanimously approved year-long moratorium on new fast-food restaurants in a 32-square-mile area, mostly in South Los Angeles, pending approval by the full council and the signature of Mayor Antonio Villaraigosa to make it the law. South LA has the highest concentration of fast-food restaurants of the city, about 400, and only a few grocery stores. L.A. Councilwoman Jan Perry proposed the measure to try to reduce health problems associated with a diet high in fast-food, like obesity and diabetes, which plague many of the half-million people living there.  (Photo by David McNew/Getty Images)
What goes into the fast food meat you eat?
01:22 - Source: CNN

Story highlights

A new report on antibiotics in fast food gave 14 US chains passing grades, while 11 failed

Panera and Chipotle led the pack for a third year in a row

CNN  — 

Our favorite fast foods could come back to bite us, according to a report released Wednesday – and it’s not just the extra calories.

The new report grades the 25 largest US fast food chains on where they stand on antibiotics.

The results are a mixed bag: For the third year in a row, the only two As were awarded to Chipotle Mexican Grill and Panera Bread. More companies passed this year than ever before.