Question: which fast food restaurants are the unhealthiest?
Answer: Sonic. Nearly 50 percent of Sonic Corp (NASDAQ: SONC)'s menu items contain at least 1 gram of saturated fat, and 10 of Sonic's hamburgers have more than 1,100 calories, making Sonic the least healthy fast-food chain on 24/7 Wall St.'s list.
Carl's Jr. ... 
Whataburger. ... 
Quizno's. ... 
Arby's. ... 
Jack in the Box. ... 
Wendy's.
Chick-fil-A. ...