They shouldn't have made the food without issuing warnings that it may cause high blood pressure, obesity, and other things. At least Cigarettes warn about causing cancer in Rats, and people still sued and won over that.
I did eat 3 or 4 times a week at fast food places while I worked. I didn't have time to make lunch most of the time, and most of my co-workers that I worked with invited me to lunch with them at the fast food places. Now we did go to Subway sometimes and other places, but mostly fast food places.